首先对材料的非连续屈服现象(Jerky流或PLC效应)进行解释,随后给出了材料的应变率灵敏度和材料失稳准则。对恒定应力速率试验结果的分析表明:PLC效应的非连续性被证明是在应力-应变曲线中以应变脉冲的形式体现出来的。最后,采用COLSYS软件模拟试件在高温失稳下的动力行为。 Firstly, we explain the discontinuous yielding of materials (Jerky flow or PLC effect), and then give the strain rate sensitivity and material instability criterion of the material. The analysis of the results of the constant stress rate test shows that the discontinuity of the PLC effect proves to be manifested as a strain pulse in the stress-strain curve. Finally, COLSYS software was used to simulate the dynamic behavior of specimens under high temperature instability.