Stress State Dependent Failure Loci of a Talc-filled Polypropylene Material under Static Loading and Dynamic Loading
A set of stress state dependent failure loci of a talc-filled Polypropylene material under static loading and dynamic loading was obtained by using a combined experimental-numerical approach.Uniaxial tension,simple shear,notched tension and punching tests were carried out to identify fracture locus under nonnegative stress triaxiality.Corresponding finite element analysis was performed to obtain the evolution of stress triaxiality of each failure element in each type of test.Different fracture prediction techniques were applied in static loading and dynamic loading,respectively.Under dynamic loading,an average value of the stress triaxiality was identified to determine stress triaxiality of critical point during the whole loading process in each type of test. By comparing force-displacement curves from both test and modeling,equivalent plastic strain in identified stress triaxiality can be obtained.Under static loading,damage evolution rule was utilized to optimize failure locus,and quadratic function was selected to optimize fracture locus.Significant difference of fracture locus between static loading and dynamic loading was observed.
Failure locus Stress triaxiality
Shaoting Lin Yong Xia Chin-Hsu Lin Jingyi Wang Gongyao Gu
Department of Automotive Engineering,Tsinghua University,Beijing 100084,China Vehicle Systems Research Laboratory,GM R&D,Michigan,USA
国际会议
北京
英文
1-16
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）