PREDICTION OF EARING IN TEXTURED ALUMINIUM SHEETS BASED ON CRYSTAL PLASTICITY |
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Authors: | Chen Yiping Dong Xianghuai Xie Chunlei ENakamachi Li Zhigang |
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Institution: | (1) State Key Lab of Plastic Forming Simulation and Die & Mould Technology, Huazhong University of Science and Technology, 430074 Wuhan, China;(2) Department of Mechanical Engineering, Osaka Institute of Technology, Osaka, Japan |
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Abstract: | The phenomenon of earing is investigated in the present study based on the theory of crystal plasticity with the dynamic explicit
finite element program developed. Firstly texture analysis is carried out of rolled aluminium alloy Al5052 by means of X-ray
technique. Then from the texture coefficients an analytical expression for the orientation distribution function (ODF) is
derived making use of the computer algebraic language Mathematica4.0, which makes it easier to discretize the ODF into a series
of Eulerian angles representing the distribution of lattices and further the preferred orientation (texture) of crystals of
the original sheets. For the polycrystal model, the material is described using crystal plasticity where each material point
in grains with each grain modelled as an FCC crystal with 12 distinct slip systems. The modified Taylor theory of crystal
plasticity is used and only the initial texture is taken into consideration during large plastic deformation. Numerical simulation
of earing has been performed for an aluminium sheet with texture and one with crystals exhibiting random distribution to demonstrate
the effect of texture of materials on their plastic anisotropy and formability.
Project supported by the National Natural Science Foundation of China (No. 59875025). |
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Keywords: | earing texture orientation distribution function(ODF) crystal plasticity |
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