一种用于材料高温蠕变分析的统一粘塑性损伤本构模型

A UNIFIED VISCOPLASTIC DAMAGE CONSTITUTIVE MODEL FOR CREEP ANALYSIS

通过应变等效假设在本文提出的具有过应力特征的统一粘塑性本构模型［５］中引入了描述材料损伤的内变量。并且给出了一个基于组合功密度概念的新的损伤模型。同以往的唯象模型相比，该损伤模型具有较明确的细观物理意义，能反映应变率和应力状态对损伤演化发展的影响。

By means of strain effective hypothesis,a damage internal variable was included the unified viscoplas-tic constitutive model possessing overstress characteristics proposed by the authOrs in this paper , and anew damage model based on combinatory work density concept has been suggested. Compared with otherphenomenal model,it has a clearer micro physical meaning, can reflect the effect of strain rate and stressstate on the damage,and can be used to describle the three phase of creep.