Yield criterions of metal plasticity in different stress states

作     者：Fengping YANG Qin SUN Wei HU 

作者机构：School of Aeronautics Northwestern Polytechnical University Xitan 710072 China Institute of Orthopedic Oncology Tangdu Hospital Fourth Military Medical University Xi＇an 710038 China 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2009年第22卷第2期

页      面：123-130页

核心收录：

学科分类：0709[理学-地质学] 081803[工学-地质工程] 07[理学] 08[工学] 0818[工学-地质资源与地质工程] 09[农学] 0901[农学-作物学] 

基　　金：express their thanks to Chinese Aircraft Strength Research Institute for financial support Dynamics and Strength Laboratory of NWPU for theirhelp in the experiments 

主　　题：Yield strength Lode stress parameter Hydrostatic pressure Finite element method (FEM) 

摘      要：Five types of tensile tests were conducted to study the yield .behavior of 2A12-T4 aluminum alloy. Parallel finite element models were built for each test and solved with ABAQUS with different yield criterions. The result shows that any of the four criterions： von Mises yield criterion, Tresca criterion, Twin-Shear criterion and yon Mises criterion with hydrostatic pressure correction, overestimates the yield strengths of the specimens. Rather than hydrostatic pressure, Lode stress parameter is the key factor that affects the differences between experimental and simulation results. Based on this concept, a new yield model with Lode dependence modified from yon Mises criterion is postulated. Although one more parameter needs to be confirmed, the simulation results of this yield model are better than those of other criterions.