YIELD SURFACES AND PLASTIC FLOW OF 45 STEEL UNDER TENSION-TORSION LOADING PATHS

An experimental analysis on the subsequent yield-surfaces evolution using multiple specimens is presented for a 45 steel after a prescribed pre-strain loading in three different directions respectively, and the yielding is defined by a designated offsetting strain. The size of the subsequent yield s...

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Bibliographic Details
Published inActa mechanica solida Sinica Vol. 25; no. 4; pp. 348 - 360
Main Authors Hu, Guijuan, Zhang, Keshi, Huang, Shihong, Ju, Jiann-Wen Woody
Format Journal Article
LanguageEnglish
Published Singapore Elsevier Ltd 01.08.2012
Springer Singapore
Subjects
45钢
Classical Mechanics
Deviation
Engineering
Evolution
Mathematical models
multiple specimen methods
offset strain
Offsets
Plastic flow
plastic flow direction
Plastic strain
Steels
Strain
subsequent yield surface
Surfaces and Interfaces
Theoretical and Applied Mechanics
Thin Films
加载路径
塑性应变
塑性流动
实验分析
屈服表面
屈服面
流动方向
multiple specimen methods
subsequent yield surface
offset strain
plastic flow direction
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Summary:An experimental analysis on the subsequent yield-surfaces evolution using multiple specimens is presented for a 45 steel after a prescribed pre-strain loading in three different directions respectively, and the yielding is defined by a designated offsetting strain. The size of the subsequent yield surface is found smaller than the initial yield surface; the negative cross effects are observed in the normal loading direction, its shape is not a Mises circle but has a rather blunt nose in loading direction and flat in the opposite. These results strongly depend on the loading path and the prescribed offset plastic strain. The plastic flow direction to the subsequent yield surface is investigated, and it is found that the plastic flow direction deviates from the normal flow rule. The deviation differs from preloading case to preloading case. And the plastic flow direction would have a larger deviation from the normal of the yield surface, if the subsequent yield was defined by a smaller offset strain. Furthermore, the experiments are simulated using the Chaboche model, and the results show that it can rationally predict yield-surface only when yield is defined by a fairly large offset strain.
Bibliography:An experimental analysis on the subsequent yield-surfaces evolution using multiple specimens is presented for a 45 steel after a prescribed pre-strain loading in three different directions respectively, and the yielding is defined by a designated offsetting strain. The size of the subsequent yield surface is found smaller than the initial yield surface; the negative cross effects are observed in the normal loading direction, its shape is not a Mises circle but has a rather blunt nose in loading direction and flat in the opposite. These results strongly depend on the loading path and the prescribed offset plastic strain. The plastic flow direction to the subsequent yield surface is investigated, and it is found that the plastic flow direction deviates from the normal flow rule. The deviation differs from preloading case to preloading case. And the plastic flow direction would have a larger deviation from the normal of the yield surface, if the subsequent yield was defined by a smaller offset strain. Furthermore, the experiments are simulated using the Chaboche model, and the results show that it can rationally predict yield-surface only when yield is defined by a fairly large offset strain.
Guijuan Hu,Keshi Zhang,Shihong Huang,Jiann-Wen Woody Ju（ 1 Key Laboratory of Disaster Prevention and Structural Safety, Guangxi University, Nanning 530004, China） （ 2 Guangxi Polytechnic of Construction, Nanning 530004, China） （ 3 Department of Civil and Environmental Engineering, University of California, Los Angeles, CA 90095-1593, USA）
subsequent yield surface; plastic flow direction; multiple specimen methods; offsetstrain
42-1121/O3
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0894-9166
1860-2134
DOI:10.1016/S0894-9166(12)60032-9