| 1. |
- Lindgren, Lars-Erik, et al.
(author)
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Automatic remeshing for three-dimensional finite element simulation of welding
- 1997
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In: Computer Methods in Applied Mechanics and Engineering. - 0045-7825 .- 1879-2138. ; 147:3-4, s. 401-409
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Journal article (peer-reviewed)abstract
- Three-dimensional finite element simulation of electron beam welding of a large copper canister has been performed. The use of an automatic remeshing algorithm, based on a graded hexahedral element was found to be effective. With this algorithm the strongly nonlinear thermomechanical effects locally close to the moving heat source can accurately be modelled using a dense element mesh that follows the heat source.
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| 2. |
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| 3. |
- Svoboda, Ales, et al.
(author)
-
The effective stress function algorithm for pressure‐dependent plasticity applied to hot isostatic pressing
- 1998
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In: International Journal for Numerical Methods in Engineering. - 0029-5981 .- 1097-0207. ; 43:4, s. 587-606
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Journal article (peer-reviewed)abstract
- An algorithm for unconditionally stable and accurate integration of elasto-viscoplastic pressure-dependent constitutive model is presented. Rate form constitutive equations of thermal-elastoviscoplastic type with compressibility take into account the changes in relative density. The algorithm computes the deviatoric and volumetric creep strains by finding the value of the effective stress which satisfies the functional relationship, the effective stress function. Thus, one non-linear scalar equation is solved to find the unknown volumetric and deviatoric components of creep strain tensor. The tangent modulus is evaluated consistent with the integration algorithm. The application of the method to the simulation of hot isostatic pressing of metal powder is shown. The paper presents the solution of the verification problem and comparison with the experimental result.
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| 4. |
- Wikander, Lars, et al.
(author)
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Plane thermo-mechanical finite element modelling of welding with special reference to the material behaviour
- 1994
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In: International conference proceedings on modeling and control of joining processes. - Miami, Fla : American Welding Society. - 087171440X ; , s. 517-524
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Conference paper (peer-reviewed)abstract
- The influence of phase changes on the residual strains in a welded hollow steel beam were investigated. A D-section beam is fabricated by U-bending 6 mm thickness SS142712 plate and welding in 10 mm thickness SS142132 plate under restraint at 0.993 MJ/m heat input. Finite element analyses were used to determine residual stresses due to cold bending and for thermomechanical welding analysis. Previously published modelling was modified to include the effect of transformation induced plasticity; cross weld residual strain distribution predicted by the two models and measured experimentally were compared; discrepancies are discussed
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