CAJ | 학술논문

对反映塑性的两个重要指标即等效塑性应变增量和体塑性应变增量进行了研究.首先采用正交流动法则,求得Tresca、Mises准则的塑性应变增量,再根据等效塑性应变增量的定义求得它们的相应等效塑性应变增量的值以及塑性体应变增量的值.对比研究发现,Tresca、Mises屈服面上均为某一常数;另外,两者的体应变增量均为零.若规定简单拉伸时两种屈服条件重合,则两者的等效塑性应变增量的相对偏差为15.5%;若规定在纯剪切时两种屈服条件重合,则两者相对偏差为零.
대반영소성적량개중요지표즉등효소성응변증량화체소성응변증량진행료연구.수선채용정교류동법칙,구득Tresca、Mises준칙적소성응변증량,재근거등효소성응변증량적정의구득타문적상응등효소성응변증량적치이급소성체응변증량적치.대비연구발현,Tresca、Mises굴복면상균위모일상수;령외,량자적체응변증량균위령.약규정간단랍신시량충굴복조건중합,칙량자적등효소성응변증량적상대편차위15.5%;약규정재순전절시량충굴복조건중합,칙량자상대편차위령.
The two important indexes characterizing plasticity of the materials i.e. the equivalent plastic strain increment and volumetric plastic strain increment were researched. First, based on rule of orthogonal flow, the plastic strain increments of Tresca and Mises criterlon were got respectively. Second, according to the definition of equivalent plastic strain increment, the corresponding values of equivalent plastic strain increments as well as the value of plastic body strain increment of them. Study indicated that /dεp/dλ was certain a constant on yield surface of Tresca and Mises, respectively; and that of the two yield criteria was zero, respectively. Their relative deviation of the equivalent plasticity strain increments was 15.5 %,assuming that the two conditions coincide under simple tension; and it was 0 assuming the two conditions coincide under pure shear.