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《Journal of Wuhan University of Technology》 2004-04
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Research and Progress of Yield Criterion for Sintered Powder Materials

HUA Lin 1,2 ,QIN Xun-peng 1 (1.School of Materials Science and Engineering, WUT, Wuhan 430070, China; 2.State Key Laboratory of Plastic Forming Simulation and Die & Mould Technology, HUST, Wuhan 430074, China)  
The basic form of yield criterion and its research situation for sintered powder materials is briefly introduced. Several typical yield criterions for sintered powder materials are analyzed, the physical property of yield is explained from point of view of critical elastic deformation energy ratio. The effects of hydrostatic stress, deviatoric stress, matrix material property, initial and instant densities, and deformation strengthening on following yield of sintered powder material are revealed based on the physical law of yield and deformation, and a unified form of function for initial and following yield of sintered powder materials is derived. A simplified yield criterion and its application are discussed, and the special case of yield criterion for sintered powder materials, which expresses the yield criterion of fully dense material, is pointed out. The deformation pressures corresponding to isotropic pressing and pure shearing processes are calculated from the yield criterion for sintered powder materials. Furthermore the yield criterion for sintered powder materials is extended to the cases of loosely piled powder and fully dense material, it is in according with the fact of yield of loosely piled copper powder and fully dense copper.
【Fund】: 国家自然科学基金项目 (5 0 175 0 86 ) ;; 塑性成形模拟及模具技术国家重点实验室开放基金 (0 2 - 3)
【CateGory Index】: TF12
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