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- Johansson, Håkan, 1979, et al.
(författare)
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Error-Controlled Identification of Viscoelastic Relaxation Spectra
- 2007
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Ingår i: Proceedings of the 20th Nordic Seminar on Computational Mechanics NSCM 20 R. Larsson and K. Runesson (eds.). - 1652-8549. - 9788496736313 ; , s. 2p abstract-
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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- Olsson, Pär, et al.
(författare)
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Atomistic simulations of elastic properties of metallic nanowires
- 2007
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Ingår i: [Host publication title missing]. - 1652-8549.
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Konferensbidrag (refereegranskat)abstract
- In this paper, we report the results of a systematic study of the scaling effects of Young's modulus of nanowires of body-centered cubic iron. The investigation is performed by employing molecular statics tensile simulations. Two different crystallographic orientations are studied. The simulations show that there is a size dependence in Young's modulus, where the different crystallographic orientations display completely different behaviors.
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| 5. |
- RAZANICA, SENAD, 1988, et al.
(författare)
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Ductile fracture modeling based on a mesh objective element removal technology
- 2014
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Ingår i: 14th European Mechanics of Materials Conference - EMMC14, 27-29 Aug. 2014, Gothenburg, Sweden. - 1652-8549.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The phenomenological Johnson-Cook continuum and failure models constitute a simple ap-proach to the modelling of ductile fracture in metals. Even though the model is simple, it catchesthe material behavior at high speed/temperature with a relatively few material parameters. Thisis an obvious advantage, in addition to its widespread use in commercial softwares, which makesit so often used in many applications, and, in particular, machining simulations of metal cuttingprocesses. Even though there are advantages with the model, a major drawback from our expe-rience1 is that the JC–material model exhibits a significant mesh size dependence in orthogonalmachining simulations.In order to overcome this difficulty a mesh objective element removal technology is devisedbased on a smeared out type of dissipation concept to represent the fracture energy. The tech-nology is investigated for the ductile failure modeling of the pearlite phase in a cast iron mi-crostructure with the objective to obtain a mesh size independent computational tool. In orderto obtain mesh objective element deletion, an element removal criterion is defined on the plasticstrain energy prior to fracture state is considered as fracture energy. A fracture state is achievedin a gauss-point when the accumulated effective plastic strain equals the fracture strain, com-puted with the Johnson-Cook fracture model. Then a total scaled fracture dissipation energy iscomputed based on the current accumulated dissipation. The figures below show the model setup, a shear loaded plate, and the computed reaction force, where vertical displacements are pre-scribed, for different mesh sizes. Indeed, our experience is that the model exhibits a significantmesh size dependence without the proper scaling of the energy dissipation.
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- Tillberg, Johan, 1980, et al.
(författare)
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On the Role of Material Dissipation for the Crack-Driving Force
- 2007
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Ingår i: 20th Nordic Seminar on Computational Mechanics, 23-24 November, Göteborg. - 1652-8549.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The crack-driving force may be defined in the context of a material force, which is the measure of the energy release rate due to a virtual extension of the crack tip. In this contribution the global energy dissipation due to crack extension in inelastic media is considered in establishing the pertinent material force.
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- Yarmohamadi, Hoda, 1980, et al.
(författare)
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Modeling of elastomeric engine mounts for commercial vehicles
- 2007
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Ingår i: Proceedings of the 20th Nordic Seminar on Computational Mechanics, NSCM 20, R.Larsson and K. Runesson (eds.), 23-24 November, 2007, Göteborg, Sweden. - 1652-8549.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- In this paper, a model of the conventional engine mount is developed and the nonlinear behavior of dynamic stiffness and damping of the engine mounts of commercial vehicles are investigated. The model comprises elastic, viscous and friction functional components and expresses the stiffness and damping of the mount as a function of frequency and amplitude of harmonic excitation. Optimization is done to identify model parameters using measurements for real elastomeric engine mounts.
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