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  Physically based crystal plasticity FEM including geometrically necessary dislocations: Numerical implementation and applications in micro-forming

Zhang, H., & Dong, X. (2015). Physically based crystal plasticity FEM including geometrically necessary dislocations: Numerical implementation and applications in micro-forming. Computational Materials Science, 110, 308-320. doi:10.1016/j.commatsci.2015.08.046.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-BAD6-C Version Permalink: http://hdl.handle.net/21.11116/0000-0001-BAD7-B
Genre: Journal Article

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 Creators:
Zhang, Haiming1, 2, Author              
Dong, Xianghuai3, Author              
Affiliations:
1Institute of Forming Technology and Equipment, Shanghai Jiao Tong University, 1954 Hua Shan Road, Shanghai, China, ou_persistent22              
2Theory and Simulation, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863392              
3Institute of Forming Technology and Equipment, Shanghai Jiao Tong University, 1954 Hua Shan Road, Shanghai, China, persistent22              

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Free keywords: Deep drawing; Dislocations (crystals); Drawing (forming); Microfabrication; Plasticity; Plasticity testing; Single crystals; Size determination, Crystal plasticity; Dislocation densities; Micro forming; Physically based modeling; Size effects, Forming
 Abstract: Due to size effects, the conventional material constitutive models are no longer valid in the investigation of micro-forming processes. In this work, a nonlocal physically based crystal plasticity FEM is developed to investigate the size effects of micro-forming. Except for statistically stored dislocations, geometrically necessary dislocations on the slip systems are introduced and calculated via the mesh-free paradigm. The micro-tensile and micro-deep drawing experiments of polycrystalline copper foils with different thicknesses and grain sizes are used to calibrate the presented nonlocal model. The comparison between simulations and experiments shows that the nonlocal physically based crystal plasticity FEM is capable of describing both the first order and the second order size effects of the micro-forming processes, and providing more microstructural clues for the interpretation of these size effects. Furthermore, the simulations of micro-deep drawings demonstrate that the presented nonlocal method is robust in the simulations with complex contact boundary conditions. © 2015 Elsevier B.V.

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Language(s): eng - English
 Dates: 2015-12
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.commatsci.2015.08.046
BibTex Citekey: Zhang2015308
 Degree: -

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Title: Computational Materials Science
  Abbreviation : Comput. Mater. Sci.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 110 Sequence Number: - Start / End Page: 308 - 320 Identifier: ISSN: 0927-0256
CoNE: /journals/resource/954925567766