| 1. |
- Berglund, Daniel, et al.
(author)
-
Simulation of welding and stress relief heat treatment of an aero engine component
- 2003
-
In: Finite elements in analysis and design (Print). - 0168-874X .- 1872-6925. ; 39:9, s. 865-881
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Journal article (peer-reviewed)abstract
- It is important to control key dimensions in aero engine components during manufacture. This is achieved by finding a stable process-parameter window for each manufacturing operation and to choose an order of manufacture which give an adequate result. Production planning has traditionally been carried out from experience and experiments. However, in order to reduce lead-time and cost, computer based numerical simulations using the finite element method is increasingly being used. Simulations can give valuable information about component dimensions, shape, and residual stresses after each manufacturing process. This paper presents a method and the results of a simulation where welding and stress relief heat treatment operations are combined. Computational fluid dynamics was also used to estimate the heat transfer coefficient of the component's surface during the heat treatment.
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| 2. |
- Hyun, Seokjeong, et al.
(author)
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Simulating a chain of manufacturing processes using a geometry-based finite element code with adaptive meshing
- 2004
-
In: Finite elements in analysis and design (Print). - 0168-874X .- 1872-6925. ; 40:5-6, s. 511-528
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Journal article (peer-reviewed)abstract
- Adaptive meshing is not only beneficial but also essential when simulating manufacturing processes. It can be used to reduce element distortions and to obtain accurate solutions in an efficient way. The versatility of combining different meshing capabilities when simulating a chain of manufacturing processes is demonstrated. The techniques have been implemented in a finite element code that is geometry oriented. This is convenient for the user and the additional complexity in the processing of the input file is compensated by the possibility to reuse this logic for transfer model definition data from old to new mesh
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| 3. |
- Mackerle, Jaroslav
(author)
-
Ceramics and ceramic matrix composites : Finite element and boundary element analyses - A bibliography (1998-2000)
- 2002
-
In: Finite elements in analysis and design (Print). - 0168-874X .- 1872-6925. ; 38:6, s. 567-577
-
Journal article (peer-reviewed)abstract
- A bibliography of references on the finite element and boundary element methods analysis of ceramics and ceramic matrix composites was presented. Topics included were: material development, constitutive modelling, fracture mechanics problems, crack initiation, and thermal shock analysis. Materials considered in the bibliography were ceramics, glass ceramics, refractory materials, ceramic thermal barrier coatings, and piezoelectric ceramics.
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| 4. |
- Mackerle, Jaroslav
(author)
-
Crystals and polycrystals : FEM and BEM material modelling
- 2002
-
In: Finite elements in analysis and design (Print). - 0168-874X .- 1872-6925. ; 38:5, s. 461-475
-
Journal article (peer-reviewed)abstract
- A list of references on crystals and polycrystals simulated using finite element method (FEM) and boundary element method (BEM) contained in bibliography were presented. General solution techniques along with problem-specific applications were also included in this bibliography. The main topics included: macromechanic, mesomechanic and micromechanic modelling, stress-strain analysis, phase-transformation problems and heat transfer analysis.
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| 5. |
- Mackerle, Jaroslav
(author)
-
Finite- and boundary-element linear and nonlinear analyses of shells and shell-like structures - A bibliography (1999-2001)
- 2002
-
In: Finite elements in analysis and design (Print). - 0168-874X .- 1872-6925. ; 38:8, s. 765-782
-
Conference paper (other academic/artistic)abstract
- A bibliography containing references to papers, conference proceedings and theses/dissertations dealing with finite element and boundary element analyses of shells and shell-like structures was presented. The bibliography contained general solution-techniques and problem specific applications. Topics discussed include static and dynamic analysis of shells, seismic analysis, impact problems, thermal and thermomechanical analysis, fracture mechanics, delamination problems, crack analysis, material processing, metal forming and adaptive modeling.
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| 6. |
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| 7. |
- Mackerle, Jaroslav
(author)
-
Finite element and boundary element simulations of indentation problems - A bibliography (1997-2000)
- 2001
-
In: Finite elements in analysis and design (Print). - 0168-874X .- 1872-6925. ; 37:10, s. 811-819
-
Research review (peer-reviewed)abstract
- A bibliography was discussed containing references to papers, conference proceedings, and theses/dissertations dealing with indentation problems. The papers considered deal with finite element method (FEM) and boundary element method (BEM) simulations of the indentation problems. Topics covered include mechanical property identification, material identification, indentation resistance, contact fatigue testing, interface toughness studies, elastic-plastic indentation, ball indentation, conical indentation, nanoindentation, Brinell testing, and Vickers testing.
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| 8. |
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| 9. |
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| 10. |
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| 11. |
- Mackerle, Jaroslav
(author)
-
Metal matrix composites : Finite element and boundary element analyse - A bibliography (1997-2000)
- 2002
-
In: Finite elements in analysis and design (Print). - 0168-874X .- 1872-6925. ; 38:7, s. 659-667
-
Journal article (peer-reviewed)abstract
- A list of references on the finite element method (FEM) and boundary element method (BEM) analyses of metal matrix composites was provided. The general solution techniques and problem-specific applications were also included. The entries were retrieved from the author's database. The references were sorted in each category alphabetically according to the first author's name.
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| 12. |
- Mackerle, Jaroslav
(author)
-
Object-oriented techniques in FEM and BEM - A bibliography (1996-1999)
- 2000
-
In: Finite elements in analysis and design (Print). - : Elsevier. - 0168-874X .- 1872-6925. ; 36:2, s. 189-196
-
Journal article (peer-reviewed)abstract
- This bibliography contains references to papers, conference proceedings and theses/dissertations dealing with object-oriented techniques implemented in finite element and boundary element methods that were published in 1996-1999. (C) 2000 Elsevier Science B.V. All rights reserved.
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| 13. |
- Mackerle, Jaroslav
(author)
-
Optics and optoelectronics : FEM and BEM analyses A bibliography (1998-1999)
- 2001
-
In: Finite elements in analysis and design (Print). - 0168-874X .- 1872-6925. ; 37:6-7, s. 575-585
-
Research review (peer-reviewed)abstract
- This bibliography contains references to papers, conference proceedings and theses/dissertations dealing with FEM and BEM analysis and modelling in optics and optoelectronics that were published in 1998-1999. © 2001 Elsevier Science B.V.
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| 14. |
- Mackerle, Jaroslav
(author)
-
Parallel finite element and boundary element analysis : Theory and applications - a bibliography (1997-1999)
- 2000
-
In: Finite elements in analysis and design (Print). - 0168-874X .- 1872-6925. ; 35:3, s. 283-296
-
Journal article (peer-reviewed)abstract
- A list of papers, conference proceedings and theses and dissertations are presented dealing with parallel finite element and boundary element analyses that were published from 1997 through 1999. General solution techniques as well as problem-specific applications are included. The main topics include parallel finite element and boundary element methods, parallel solution techniques, parallel decomposition algorithms, mixed domain decompositions algorithms, transient domain decomposition methods, preconditioned conjugate gradient methods, preconditioned Lanczos methods, the Schwartz method, preconditioned Krylov subspace methods, parallel iterative solvers, iterative group-implicit algorithms, partitioning approaches, and several more.
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| 15. |
- Mackerle, Jaroslav
(author)
-
Topology and shape optimization of structures using FEM and BEM : A bibliography (1999-2001)
- 2003
-
In: Finite elements in analysis and design (Print). - 0168-874X .- 1872-6925. ; 39:3, s. 243-253
-
Journal article (peer-reviewed)abstract
- Topology and shape optimization of structures were discussed using finite element method (FEM) and boundary element method (BEM). The bibliography contained references to papers, conference proceedings and theses/dissertations dealing with the topology and shape optimization published in 1999-2001. General solution techniques and problem-specific applications were also included.
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| 16. |
- Alsafadie, R., et al.
(author)
-
Local formulation for elasto-plastic corotational thin-walled beams based on higher-order curvature terms
- 2011
-
In: Finite elements in analysis and design (Print). - : Elsevier. - 0168-874X .- 1872-6925. ; 47:2, s. 119-128
-
Journal article (peer-reviewed)abstract
- The paper deals with the derivation of a local elasto-plastic finite element formulation of three dimensional corotational beams with arbitrary cross- section. Based on Bernoulli beam kinematics, an improved displacement field is constructed by inclusion of second-order terms of cross-section local rotations. The formulation captures both the Saint-Venant and warping torsional effects of open cross sections. Numerical tests show that the inclusion of the second-order terms of the local bending curvatures gives more accurate and more efficient element that allows a significant reduction of the computational time.
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| 17. |
- Brauer, Jesper
(author)
-
A general finite element model of involute gears
- 2004
-
In: Finite elements in analysis and design (Print). - : Elsevier BV. - 0168-874X .- 1872-6925. ; 40:13-14, s. 1857-1872
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Journal article (peer-reviewed)abstract
- Involute gears comprise primarily spur gears, helical gears, straight conical involute gears and conical involute gears. Robust and effective parameterised finite element models of involute gears should be based on analytically derived mathematical representations of their shape. In this paper we derive a mathematical description of conical involute gears that is also capable of representing three other types of involute gear. The equations and the intervals for the surface parameters are then used to create a general finite element model of involute gears.
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| 18. |
- Brauer, Jesper
(author)
-
Transmission error in anti-backlash conical involute gear transmissions : a global-local FE approach
- 2005
-
In: Finite elements in analysis and design (Print). - : Elsevier BV. - 0168-874X .- 1872-6925. ; 41:5, s. 431-457
-
Journal article (peer-reviewed)abstract
- This paper reports on a theoretical study of transmission errors in anti-backlash conical involute gear transmissions. Such transmissions are used to reduce or eliminate the backlash in mechatronic products such as industrial robots and thereby improving system stability. A global-local finite-element (FE) approach reduced the total computation time needed to solve the non-linear contact problems. This approach yields a dense FE mesh in the contact regions and a coarse mesh in the rest of the teeth.
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| 19. |
- Burman, Erik, et al.
(author)
-
A simple approach for finite element simulation of reinforced plates
- 2018
-
In: Finite elements in analysis and design (Print). - : Elsevier. - 0168-874X .- 1872-6925. ; 142, s. 51-60
-
Journal article (peer-reviewed)abstract
- We present a new approach for adding Bernoulli beam reinforcements to Kirchhoff plates. The plate is discretised using a continuous/discontinuous finite element method based on standard continuous piecewise polynomial finite element spaces. The beams are discretised by the CutFEM technique of letting the basis functions of the plate represent also the beams which are allowed to pass through the plate elements. This allows for a fast and easy way of assessing where the plate should be supported, for instance, in an optimization loop.
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| 20. |
- Chhang, Sophy, et al.
(author)
-
Energy-momentum method for co-rotational plane beams : A comparative study of shear flexible formulations
- 2017
-
In: Finite elements in analysis and design (Print). - : Elsevier. - 0168-874X .- 1872-6925. ; 134, s. 41-54
-
Journal article (peer-reviewed)abstract
- This paper presents an energy-momentum method for three dynamic co-rotational formulations of shear flexible 2D beams. The classical midpoint rule is applied for both kinematic and strain quantities. Although the idea as such was developed in previous work, its realization and testing in the context of co-rotational Timoshenko 2D beam elements is done here for the first time. The main interest of the method is that the total energy and momenta are conserved. The three proposed formulations are based on the same co-rotational framework but they differ in the assumptions done to derive the local formulations. Four numerical applications are used to assess the accuracy and efficiency of each formulation. In particularly, the conservation of energy with a very large number of steps and the possibility to simplify the tangent dynamic matrix are investigated.
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| 21. |
- Di Stasio, Luca, 1988-, et al.
(author)
-
Finite Element solution of the fiber/matrix interface crack problem : Convergence properties and mode mixity of the Virtual Crack Closure Technique
- 2019
-
In: Finite elements in analysis and design (Print). - : Elsevier. - 0168-874X .- 1872-6925. ; 167
-
Journal article (peer-reviewed)abstract
- The bi-material interface arc crack has been the focus of interest in the composite community, where it is usually referred to as the fiber-matrix interface crack. In this work, we investigate the convergence properties of the Virtual Crack Closure Technique (VCCT) when applied to the evaluation of the Mode I, Mode II and total Energy Release Rate of the fiber-matrix interface crack in the context of the Finite Element Method (FEM). We first propose a synthetic vectorial formulation of the VCCT. Thanks to this formulation, we study the convergence properties of the method, both analytically and numerically. It is found that Mode I and Mode II Energy Release Rate (ERR) possess a logarithmic dependency with respect to the size of the elements in the crack tip neighborhood, while the total ERR is independent of element size.
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| 22. |
- Elkhodbia, Mohamed, et al.
(author)
-
Finite element modeling of the electrical impedance tomography technique driven by machine learning
- 2023
-
In: Finite elements in analysis and design (Print). - : Elsevier BV. - 0168-874X .- 1872-6925. ; 223
-
Journal article (peer-reviewed)abstract
- To create a human-like skin for a robotic application, current touch sensor technologies have a few drawbacks. Electrical Impedance Tomography (EIT) is a candidate for this application due to its applicability over complex geometries; nevertheless, it has accuracy concerns. This study employs artificial neural networks (ANNs) to investigate the accuracy and capability of EIT-based touch sensors. A finite element (FE) model is utilized to solve the forward EIT problem while simultaneously determining the system's comprehensive mechanical response. The FE model is comprised of a polyurethane (PU) foam domain, a conductive spray layer and a set of sixteen electrodes. To replicate the process of touching the sensor body, a punch of varying diameters and touch forces is utilized. The mechanical response of the sensor body is modeled using the hyperfoam material model calibrated through experimental uniaxial and shear test data, while the electric conductivity of the sprayed skin surface is obtained experimentally as function of applied strain. The viscoelastic behavior of the PU foam material is also obtained experimentally. These experimental data were implemented in the FE model through user subroutines to model the mechanical and electrical properties of the sensor in the EIT forward problem. The traditional EIT inverse problem image reconstruction was replaced utilizing ANNs as an alternative to extract mechanics based parameters. The ANNs were created to predict the spatial coordinates of the touch point, and they were proven to be extremely accurate. Using the EIT voltage readings as input, the ANNs were utilized to forecast the system's mechanical behavior such as contact pressure, contact area, indentation depth, and touching force.
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| 23. |
- Fisk, Martin, 1981-, et al.
(author)
-
Modelling of induction hardening in low alloy steels
- 2018
-
In: Finite elements in analysis and design (Print). - : Elsevier. - 0168-874X .- 1872-6925. ; 144, s. 61-75
-
Journal article (peer-reviewed)abstract
- Induction hardening is a useful method for improving resistance to surface indentation, fatigue and wear that is favoured in comparison with through hardening, which may lack necessary toughness. The process itself involves fast heating by induction with subsequent quenching, creating a martensitic layer at the surface of the workpiece. In the present work, we demonstrate how to simulate the process of induction hardening using a commercial finite element software package with focuses on validation of the electromagnetic and thermal parts, together with evolution of the microstructure. Experiments have been carried out using fifteen workpieces that have been heated using three different heating rates and five different peak temperatures resulting in different microstructures. It is found that the microstructure and hardening depth is affected by the heating rate and peak temperature. The agreement between the experimental and simulated results is good. Also, it is demonstrated that the critical equilibrium temperatures for phase transformation is important for good agreement between the simulated and experimental hardening depth. The developed simulation technique predicts the hardness and microstructure sufficiently well for design and the development of induction hardening processes.
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| 24. |
- Fisk, Martin, et al.
(author)
-
Simulation and validation of repair welding and heat treatment of an alloy 718 plate
- 2012
-
In: Finite elements in analysis and design (Print). - : Elsevier BV. - 0168-874X .- 1872-6925. ; 58, s. 66-73
-
Journal article (peer-reviewed)abstract
- This paper describes simulation of repair welding and heat treatment together with measurements for validation. The possibility to replace global heat treatment with local using induction heating is evaluated with respect to obtained residual stresses. A physically based material model is used in the analyses. The result from the residual stress measurement shows that there are no significant differences between local heat treatment and global heat treatment.
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| 25. |
- Fisk, Martin, et al.
(author)
-
Simulation of microstructural evolution during repair welding of an IN718 plate
- 2016
-
In: Finite elements in analysis and design (Print). - : Elsevier. - 0168-874X .- 1872-6925. ; 120, s. 92-101
-
Journal article (peer-reviewed)abstract
- A precipitate evolution model based on classical nucleation, growth and coarsening theory is adapted and solved using the multi-class approach for the superalloy IN718. The model accounts for dissolution of precipitates and is implemented in a finite element program. The model is used to simulate precipitate evolution in the fused zone and the adjacent heat affected zone for a welding simulation. The calculated size distribution of precipitates is used to predict Vickers hardness. The simulation model is compared with nanoindentation experiments. The agreement between simulated and measured hardness is good. (C) 2016 Elsevier B.V. All rights reserved.
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| 26. |
- Frenning, Göran
(author)
-
Towards a mechanistic contact model for elastoplastic particles at high relative densities
- 2015
-
In: Finite elements in analysis and design (Print). - : Elsevier BV. - 0168-874X .- 1872-6925. ; 104, s. 56-60
-
Journal article (peer-reviewed)abstract
- Triaxial compression of elastoplastic particles was studied with numerical and analytical methods in order to develop a mechanistic model for their interactions at high relative densities. The introduction of an equivalent particle radius that accounted for the elastic volumetric deformation enabled an almost perfect reduction of the results obtained for elastoplastic particles to those obtained for rigid, perfectly plastic ones. This, in turn, made possible a simplified yet mechanistic analytical analysis of the particle response in terms of the contact area, pressure and force. The developed model exhibited a good agreement with the numerical results, especially for intermediate and large strains, and hence laid the foundations for the development of mechanistic contact models suitable for simulations of granular materials at high relative densities with the Discrete Element Method (DEM).
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| 27. |
- Hansbo, Peter, et al.
(author)
-
A discontinuous Galerkin method for cohesive zone modelling
- 2015
-
In: Finite elements in analysis and design (Print). - : Elsevier. - 0168-874X .- 1872-6925. ; 102-103, s. 1-6
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Journal article (peer-reviewed)abstract
- We propose a discontinuous finite element method for small strain elasticity allowing for cohesive zone modeling. The method yields a seamless transition between the discontinuous Galerkin method and classical cohesive zone modeling. Some relevant numerical examples are presented. © 2015 Elsevier B.V.
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| 28. |
- Hansbo, Peter, et al.
(author)
-
Least-squares stabilized augmented Lagrangian multiplier method for elastic contact
- 2016
-
In: Finite elements in analysis and design (Print). - : Elsevier. - 0168-874X .- 1872-6925. ; 116, s. 32-37
-
Journal article (peer-reviewed)abstract
- In this paper, we propose a stabilized augmented Lagrange multiplier method for the finite element solution of small deformation elastic contact problems. We limit ourselves to friction-free contact with a rigid obstacle, but the formulation is readily extendable to more complex situations. © 2016 Elsevier B.V.
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| 29. |
- Hansson, Sofia, et al.
(author)
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Simulations and measurements of combined induction heating and extrusion processes
- 2010
-
In: Finite elements in analysis and design (Print). - : Elsevier. - 0168-874X .- 1872-6925. ; 46:10, s. 905-915
-
Journal article (peer-reviewed)abstract
- The manufacturing process chain at glass-lubricated extrusion of stainless steel tubing is simulated using the finite element method. The developed model includes sub-models of induction heating, expansion and extrusion. An in-house mapping tool is used to transfer the temperature fields between the electromagnetic-thermal and thermo-mechanical analyses. Using the combined model it is possible to study the influence of different process parameters on the temperature distribution in the billet, and how this affects the final extrusion properties. In this study, the model is applied to two cases of tube extrusion, one using an austenitic stainless steel and one using a duplex, austenitic/ferritic, stainless steel. It is shown that the induction heating model successfully predicts the temperatures obtained experimentally from thermocouples placed in the steel billets during heating. The agreement between models and experiments regarding extrusion force and expansion force is satisfactory.
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| 30. |
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| 31. |
- Heng, Piseth, et al.
(author)
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Co-rotating rigid beam with generalized plastic hinges for the nonlinear dynamic analysis of planar framed structures subjected to impact loading
- 2019
-
In: Finite elements in analysis and design (Print). - : ELSEVIER SCIENCE BV. - 0168-874X .- 1872-6925. ; 157, s. 38-49
-
Journal article (peer-reviewed)abstract
- The purpose of this paper is to model the nonlinear dynamical response of steel frame structures subjected to impact loading. A 2D co-rotational rigid beam element with generalized elasto-plastic hinges is presented. The main idea is to integrate the concept of the generalized elasto-plastic hinge into the standard co-rotational framework by performing a static condensation procedure in order to remove extra internal nodes and their corresponding degrees of freedom. In addition, impact loading is applied through a contact model that is described in the rigorous framework of non-smooth dynamics. In this framework, equations of motion are derived using a set of differential measures and convex analysis tools, whereas Newton's impact law is imposed by means of a restitution coefficient in order to accommodate energy losses. An energy and momentum conserving scheme is adopted to solve the dynamical equations. The main interest of the current model is the ability to evaluate the geometrically nonlinear inelastic behaviour of steel structures with semi-rigid connections subjected to impact in a simple and efficient way, using only a few number of elements. The accuracy of the proposed formulation is assessed in three numerical applications.
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| 32. |
- Kroon, Martin, Professor, 1974-, et al.
(author)
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A strongly objective, robust integration algorithm for Eulerian evolution equations modeling general anisotropic elastic-inelastic material response
- 2020
-
In: Finite elements in analysis and design (Print). - : Elsevier. - 0168-874X .- 1872-6925. ; 177, s. 1-15
-
Journal article (peer-reviewed)abstract
- A background to the constitutive modeling of elastic-inelastic material response is provided to highlight the uniqueness of the Eulerian formulation of general nonlinear fully anisotropic thermoelastic-inelastic materials proposed in Rubin (1994) [1]. This model introduced Eulerian evolution equations for a triad of microstructural vectors that characterize elastic deformations and anisotropic orientations. Components of tensors which transform like the Cauchy stress referred to these vectors are insensitive to superposed rigid body motions so they can be used to formulate general elastically and inelastically anisotropic constitutive equations. This paper develops a strongly objective, robust numerical algorithm for integrating the evolution equations for the microstructural vectors. This algorithm can easily be implemented into computer codes to simplify the use of general anisotropic constitutive equations for thermoelastic-inelastic material response.
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| 33. |
- Larsson, Johan, et al.
(author)
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Mass minimization with conflicting dynamic constraints by topology optimization using sequential integer programming
- 2022
-
In: Finite elements in analysis and design (Print). - : Elsevier BV. - 0168-874X .- 1872-6925. ; 200, s. 103683-
-
Journal article (peer-reviewed)abstract
- In this paper mass minimization of hysteretically damped structures subjected to static and time-harmonic loading is studied via the Topology Optimization of Binary Structures (TOBS) method. Elements are removed or added to the finite element model of a structure in every iteration based on the solution to an integer linear program (ILP). The ILP is constructed from the sensitivity information of the objective function and the constraints which are in the form of the static and dynamic compliance. The proposed methodology is demonstrated on a 2D clamped-clamped beam and compared with published results for a 2D cantilever beam. The optimization starts from the full design domain and solutions with low mass that fulfill the constraints for a range of different bounds are found. The results also indicate that the mass is much more sensitive to changes in the static compliance constraint than in the dynamic compliance constraint. The effect of mass and upper bound of the constraints on the dynamic compliance at the fundamental resonance frequency is also studied, though no clear conclusions can be drawn. Finally the sensitivity information at the converged topology is studied and it is shown that the algorithm converges because the structural regions that are non-critical for the different constraints do not overlap.
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| 34. |
- Le, Thanh-Nam, et al.
(author)
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Dynamics of 3D beam elements in a corotational context : A comparative study of established and new formulations
- 2012
-
In: Finite elements in analysis and design (Print). - : Elsevier BV. - 0168-874X .- 1872-6925. ; 61, s. 97-111
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Journal article (peer-reviewed)abstract
- This paper deals with Newmark time stepping methods and finite rotations for nonlinear finite element analysis of flexible beam structures. The corotational method is used to develop expressions of the internal forces and the corresponding tangent stiffness matrices. For the dynamic part, four formulations based on different parameterizations of rotations are compared. The first three are classic formulations taken from the literature with some modifications for two of them. The last one is new and uses three of the four Euler parameters (quaternion) as rotational variables. For all these approaches, theoretical derivations as well as practical implementations are given in detail. The similarities and differences between the formulations are pointed out. Six numerical examples are studied in order to compare these four formulations in terms of numerical accuracy and computational efficiency. Regarding efficiency, the choice of the predictor at each time step and the possibility to simplify the tangent inertia matrix are carefully investigated. The numerical results show that these four formulations have the same numerical accuracy, but that the computational efficiency depends on the choice of the tangent inertia matrix. Besides, the new formulation proposed in this paper turns out to be the fastest one.
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| 35. |
- Lundbäck, Andreas, et al.
(author)
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Modelling of metal deposition
- 2011
-
In: Finite elements in analysis and design (Print). - : Elsevier BV. - 0168-874X .- 1872-6925. ; 47:10, s. 1169-1177
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Journal article (peer-reviewed)abstract
- Modelling and simulation of metal deposition (MD) poses several challenges to the modeller in addition to the usual challenges in modelling of welding. The aim of the work presented in this paper is to enable simulation of metal deposition for large three-dimensional components. Weld paths that are created in an off-line programming system (OLP) can be used directly to prescribe the movement of the heat source in the model. The addition of filler material is done by activation of elements. Special care must be taken to the positioning of the elements, due to large deformations. Nodes are moved to ensure that the added material has correct volume and shape. A physically based material model is also implemented. This material model is able to describe the material behaviour over a large strain, strain rate and temperature range. Temperature measurements and deformation measurements are done in order to validate the model. The computed thermal history is in very good agreement with measurements. The computed and measured deformations also show quite good agreement. It has been shown that the approach yields correct results, providing that flow stress and heat input models are calibrated with sufficient accuracy. The method reduces the modelling work considerably for metal deposition and multipass welding. It can be used for detailed models but also lumping of welds is possible and often necessary for industrial applications.
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| 36. |
- Mackerle, Jaroslav
(author)
-
FEM and BEM analysis and modelling of residual stresses - A bibliography (1998-1999)
- 2001
-
In: Finite elements in analysis and design (Print). - 0168-874X .- 1872-6925. ; 37:3, s. 253-262
-
Research review (peer-reviewed)abstract
- This bibliography contains references to papers, conference proceedings and theses/dissertations dealing with FEM and BEM analysis and modelling of residual stresses that were published in 1998-1999. (C) 2001 Elsevier Science B.V. All rights reserved.
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| 37. |
- Mackerle, Jaroslav
(author)
-
FEM and BEM in electronic packaging - A bibliography (1998-1999)
- 2001
-
In: Finite elements in analysis and design (Print). - 0168-874X .- 1872-6925. ; 37:2
-
Other publication (other academic/artistic)abstract
- This bibliography contains references to papers, conference proceedings and theses/dissertations dealing with the implementation of finite element and boundary element methods in electronic packaging that were published in 1998-1999. (C) 2001 Elsevier Science B.V. All rights reserved.
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| 38. |
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| 39. |
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| 40. |
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| 41. |
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| 42. |
- Mackerle, Jaroslav
(author)
-
Smart materials and structures : FEM and BEM simulations - A bibliography (1997-1999)
- 2001
-
In: Finite elements in analysis and design (Print). - 0168-874X .- 1872-6925. ; 37:1
-
Other publication (other academic/artistic)abstract
- This bibliography contains references to papers, conference proceedings and theses/dissertations dealing with smart materials and structures simulated by the finite element and boundary element methods that were published in 1997-1999. (C) 2001 Elsevier Science B.V. All rights reserved.
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| 43. |
- Nadampalli, Ravi V., et al.
(author)
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Implementing Linear Modelling of Interface Damping in a Finite Element Software
-
In: Finite elements in analysis and design (Print). - 0168-874X .- 1872-6925.
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Journal article (other academic/artistic)abstract
- In the automotive industry virtual modelling of losses in a built-up structure is still a challenge. A body-in-white car structure consists of many spot-welded parts and the modelling of their associated losses is highly interesting. For this purpose, the dissipation of mechanical energy is here modelled in the frame of large scale computations using linear techniques with commercially available finite element software. Mechanical, vibration damping is introduced through external forces which are pairwise applied such that they oppose the relative motion at the contact interfaces between two parts. Two aspects are investigated, first if the proposed modelling captures the main mechanisms of the damping on a system level. Second, if the predicted local vibration responses at different locations correlate well between predicted and previously measured (in vacuo) spectra. Initial simulations show promising results and the level of damping observed in the predictions are similar to the measured spectra, fo rvibration shapes which involve significant relative motion along the spot-welded surfaces. An advantage with this technique is that it helps in understanding of different sources of total system damping, i.e. due to material and other sources of damping. It is verified that non-material damping due to mechanical contact is a significant contributor to the losses in a built-up structure which may be simulated with the proposed technique. In the paper the overall approach is discussed together with the specific aspects of the finite element implementation technique proposed.
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| 44. |
- Tersing, Henrik, et al.
(author)
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Simulation of manufacturing chain of a titanium aerospace component with experimental validation
- 2012
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In: Finite elements in analysis and design (Print). - : Elsevier BV. - 0168-874X .- 1872-6925. ; 51, s. 10-21
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Journal article (peer-reviewed)abstract
- Manufacturing of advanced components like aeroengine parts is performed in a global network. Different manufacturers deliver individual components to the engine and even different manufacturing steps for a given component may be performed at different companies. Furthermore, quality is of utmost importance in this context. Simulations are increasingly used to assure the latter. The current paper describes the simulation of a chain of manufacturing processes for an aeroengine component. Different partners have performed the simulations of the different steps using a variety of finite element codes. The results are discussed in the paper and particularly the lessons learned regarding the modelling process.
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| 45. |
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| 46. |
- Unosson, Mattias, et al.
(author)
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Failure modelling in finite element analyses : Element erosion with crack-tip enhancement
- 2006
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In: Finite elements in analysis and design (Print). - : Elsevier. - 0168-874X .- 1872-6925. ; 42:4, s. 283-297
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Journal article (peer-reviewed)abstract
- A method to better handle fracture using element erosion in finite element analyses is proposed. It is assumed that the crack-tip is blunt and that the solution in the vicinity of the crack-tip is separable when described in local polar co-ordinates. The numerical solution is enhanced by scaling strain rates at integration points to better match the state at the crack-tip. This material specific scaling function is empirically determined for modus I steady-state propagation and is applied to two problems. The results show that the method reduces mesh dependency such that the chosen fracture energy can be better matched for different element sizes.
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| 47. |
- Flodén, O., et al.
(author)
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Predicting structure-borne noise in cross-laminated timber buildings during conceptual design
- 2023
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In: Finite Elements in Analysis and Design. - 0168-874X. ; 225
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Journal article (peer-reviewed)abstract
- In this study, we investigate the feasibility of using a vibration-based metric for predicting low-frequency structure-borne noise in cross-laminated timber (CLT) buildings. The overall aim here is to facilitate the conceptual design for CLT buildings in terms of estimating noise levels. Since noise levels are inherently sensitive to architectural or mechanical design changes, in the low frequency regime, the problem of predicting these as a metric is well-known as a “high in computational cost” but “low in confidence solution” problem. Here, a reduced and robust prediction metric offers a way forward in estimating intrusive noise levels while capturing the effect of conceptual design changes. The degree of correlation between the vibration-based metric and the predicted noise levels was investigated by performing linear regression on datasets generated from a parameterised finite element model of a CLT building structure. A generally high degree of correlation between the vibration-based metric and the noise levels is observed. The effect of employing various frequency bands and sets of vibration evaluation points are investigated, and it is concluded that a high degree of correlation is obtained using only 3 × 3 vibration evaluation points per CLT panel.
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| 48. |
- Leppänen, Joosef, 1970, et al.
(author)
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On the dynamic response of reinforced concrete beams subjected to drop weight impact
- 2020
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In: Finite Elements in Analysis and Design. - : Elsevier BV. - 0168-874X. ; 180
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Journal article (peer-reviewed)abstract
- To improve the impact resistance of reinforced concrete structures, a detailed understanding of the dynamic response is required. This study investigates this impact resistance using experiments in combination with 3D non-linear finite element (FE) simulations. The experiments made use of high-speed photography and digital image correlation (DIC), while a damage-plasticity constitutive model for concrete was used in the FE simulations. Drop weight impact tests of simply supported reinforced beams made of plain concrete and fibre reinforced concrete were made, and it was shown that the addition of fibres reduced crack spacing, crack widths and midpoint deflections. For the FE approach, tetrahedral elements were shown to be well suited for capturing inclined shear cracks and the structural response obtained in experiments and analyses agreed very well. The FE analyses showed that the reinforcement strains were more localised for concrete with fibres, and hence predicted an increased risk of reinforcement rupture.
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| 49. |
- Ljustina, Goran, 1971, et al.
(author)
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A FE based machining simulation methodology accounting for cast iron microstructure
- 2014
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In: Finite Elements in Analysis and Design. - : Elsevier BV. - 0168-874X. ; 80, s. 1-10
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Journal article (peer-reviewed)abstract
- In the present paper the effect of graphite nodularity in the microstructure of cast iron is assessed with respect to its machinability at orthogonal cutting. A micro-structure based model of the cast iron material has been developed based on analyses of micro-graph images. The image analysis combines pearlitic grains with graphite nodules to produce the micro-structures. Continuous deformation behavior of pearlite and graphite phases is described using the Johnson-Cook (JC) viscoplasticty model including temperature dependence. Of particular concern is the modeling of the chip formation, induced by the micro-structure morphology and the mechanical behavior of the work piece material in the vicinity of the insert. This is described by the element deletion methodology along with the Johnson-Cook failure criterion to realize the fracture kinematics. A parametric study is carried out by varying the nodularity of the graphite. To validate the model, the finite element results are compared to machining test results carried out on a Compacted Graphite Iron (CGl) material in a related paper It turns out that the FE-simulated and experimentally observed cutting force and chip formation compare fairly well.
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| 50. |
- Mahal, Mohammed, et al.
(author)
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A two-scale damage model for high-cycle fatigue at the fiber-reinforced polymer-concrete interface
- 2016
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In: Computers and Concrete. - : Elsevier BV. - 1598-8198. ; 116, s. 12-20
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Journal article (peer-reviewed)abstract
- This paper presents a new two-scale damage model of the fiber-reinforced polymer (FRP)-concrete bond under high-cycle fatigue. The material behavior is modeled as elastic-plastic coupled with damage for the microscale analysis and as elastic for the mesoscale analysis. A new damage law for the interface joint is described. The two-scale damage model has been implemented as a material model for a three dimensional an eight-node interface element of zero thickness and used to simulate a double shear joint specimen under high cycle fatigue. The numerical calculations were performed with a full incremental cycle solution and a new cycle jump approach. Comparing the results from the finite element method (FEM) model with experimental data shows that the model is capable of accurately predicting the cyclic fatigue loading slip response of the joint interface.
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