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  Experimental and numerical studies of coupling size effects on material behaviors of polycrystalline metallic foils in microscale plastic deformation

Zhang, H., & Dong, X. (2016). Experimental and numerical studies of coupling size effects on material behaviors of polycrystalline metallic foils in microscale plastic deformation. Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing, 658, 450-462. doi:10.1016/j.msea.2016.01.116.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-B858-D Version Permalink: http://hdl.handle.net/21.11116/0000-0001-B859-C
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: Copper; Dislocations (crystals); Grain size and shape; Metal forming; Plastic deformation; Plasticity; Single crystals, Crystal plasticity; Crystallographic orientations; Experimental and numerical studies; Geometrically necessary dislocations; Micro tension; Nonlocal material models; Size effects; Statistically stored dislocations, Size determination
 Abstract: A more comprehensive investigation of size effects is essential for the design and optimization of micro-metal forming processes. In this work, the micro-tension of polycrystalline copper foils with different thicknesses and grain sizes is investigated using both experimental and numerical techniques. A nonlocal physically based crystal plasticity (CP) FEM using the densities of statistically stored dislocations and geometrically necessary dislocations as the internal state variables is applied to simulate the micro-tensile operations. The micro-tensile experiments show that the mechanical properties of copper foils are affected synthetically by the grain size, sample size, and crystallographic orientation. The simulation results show good agreement with the experimental results in terms of flow stress. In addition, the first order and second order size effects are well captured. The research finds that the number of grains across the thickness is a prominent factor to affect the intergranular and intragranular deformation heterogeneities, which play a key role in controlling the formation of shear bands, the strength, and failure modes of materials at microscale. The modeling gives access to more physically based details about the microscale plastic deformation, and shows the potential of using nonlocal physically based CPFEM in the investigation of micro-metal forming. © 2016 Elsevier B.V..

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Language(s): eng - English
 Dates: 2016-03-21
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.msea.2016.01.116
BibTex Citekey: Zhang2016450
 Degree: -

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Title: Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing
  Abbreviation : Mater. Sci. Eng. A: Struct. Mater. Prop. Microstruct. Process.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: New York, NY : Elsevier
Pages: - Volume / Issue: 658 Sequence Number: - Start / End Page: 450 - 462 Identifier: ISSN: 0921-5093
CoNE: https://pure.mpg.de/cone/journals/resource/954928498465_1