Modeling of additively manufactured materials using gradient-enhanced crystal plasticity

Kergassner, A., Mergheim, J. and Steinmann, P. (2019) Modeling of additively manufactured materials using gradient-enhanced crystal plasticity. Computers and Mathematics with Applications, 78(7), pp. 2338-2350. (doi: 10.1016/j.camwa.2018.05.016)

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Abstract

Additively manufactured metals possess a particular grain structure – ranging from equiaxed grains to columnar grains – which is strongly influenced by the manufacturing process. The grain structure determines the material behavior and therefore influences the mechanical behavior of additively manufactured parts. In the present contribution a mesoscopic model, based on gradient-enhanced crystal plasticity, is developed and used to simulate the behavior of additively manufactured Inconel 718. The gradient-enhanced crystal plasticity model is extended to account for relative misorientations of the grain boundaries. Representative Volume Elements of the material are generated using a Voronoi tessellation based method. Computational homogenization is used to identify the macroscopic elastic and plastic mechanical behavior, such as the anisotropic Young’s moduli and the yield locus diagram. The numerical results are validated against experimental data.

Item Type:Articles
Additional Information:The authors gratefully acknowledge the financial support by the German Science Foundation (DFG) within the Collaborative Research Center 814: Additive Manufacturing (subproject C5).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Steinmann, Professor Paul
Authors: Kergassner, A., Mergheim, J., and Steinmann, P.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:Computers and Mathematics with Applications
Publisher:Elsevier
ISSN:0898-1221
ISSN (Online):1873-7668
Published Online:14 June 2018

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