CRYSTAL PLASTICITY NUMERICAL ANALYSIS ON YIELD AND SUBSEQUENT YIELD OF POLYCRYS-TALLINE COPPER UNDER COMBINED TENSION–TORSION LOADING

doi:10.3724/SP.J.1037.2009.00752

Acta Metall Sin

2010, Vol. 46

Issue (4): 466-472 DOI: 10.3724/SP.J.1037.2009.00752

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CRYSTAL PLASTICITY NUMERICAL ANALYSIS ON YIELD AND SUBSEQUENT YIELD OF POLYCRYS-TALLINE COPPER UNDER COMBINED TENSION–TORSION LOADING

HU Guijuan^1;2; ZHANG Keshi ¹; SHI Yanke ¹; SU Li ³

1. Key Laboratory of Disaster Prevention and Structural Safety; Guangxi University; Nanning 530004
2. Guangxi Polytechnic of Construction; Nanning 530004
3. Institute No. 210 of the Second Academy of the CASIC; Xi’an 710065

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HU Guijuan ZHANG Keshi SHI Yanke SU Li . CRYSTAL PLASTICITY NUMERICAL ANALYSIS ON YIELD AND SUBSEQUENT YIELD OF POLYCRYS-TALLINE COPPER UNDER COMBINED TENSION–TORSION LOADING. Acta Metall Sin, 2010, 46(4): 466-472.

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Abstract

Combined tension–torsion test under pre–tension and pre–torsion deformation, the yield characteristics of polycrystalline copper in grain scale was investigated by crystal plasticity theory associated with polycrystalline aggregate model. Through a sub–model method, the cross–scale analyses of mechanical behavior of polycrystalline copper by the calculations using a representative volume element (RVE) and a specimen under tension and torsion were carried out. Based on the research on the shape and the evolution of a subsequent yield surface, the effects of different loading paths and yield definitions on the subsequent yield surface were explored. The heterogeneous statistical nlysis of the polycrystalline copper under different loading paths was also performed. And further more, the effects of loading history on the subsequent yield surface, and on the micro heterogeneous distribution were estimated. The numerical results show that the shape of the subsequent yield surface and the appearance of yield surface corner are related to the pre–loading direction and the different yield definitions, the heterogeneous deformation in polycrystal under different loading paths is very various. The results by the analyibased on crystal plasticity calculation combined with the sub–model method are compared with experimental results and they are in reasonable agreement.

Key words: crystal plasticity subsequent yield surface sub-model method polycrystal Cu

Received: 11 November 2009

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Supported by National Natural Science Foundation of China (Nos. 90815001 and 10662001), Natural Science Foundation of Guangxi Province (No.0832024) and Science Foundation of Guangxi University

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	HU Gui-Juan
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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2009.00752 OR https://www.ams.org.cn/EN/Y2010/V46/I4/466

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