损伤材料的无屈服粘塑性本构模型

利用Ｓｈｉｍａ和Ｏｙａｎｅ给出的一套塑性热函数，修正了经典粘塑性本构研究的Ｂ－Ｐ模型，新的模型计入了损伤的影响，此外，由该模型自然可以得到损伤材料的塑性可压缩性，由于采用了简洁的塑性势子数，无屈服Ｂ－Ｐ模型形式简洁，便于工程应用，作了例子，计算了单轴拉伸时流动应力的率敏感性，其计算结果与以往的工作十分吻合。

Non-yielding Viscoplastic Constitutive Model for Damaged Materials

The classical viscoplastic nonyielding B - P model is modified by employing a set of plastic potential developed by Shima and Oyane. The plastic damage is taken into account in the present model. Moreover, the plastic compressibility of damaged materials can be naturally obtained from the present model. It is brought about in the model that the expression is quite simple for engineering use. As an example, the uniaxial tensile yielding stress Versus strain rate is computed at various strain rate sensitivities. The results are in good agreement with available da- ta.