韧性断裂的微孔损伤理论分析

在连续损伤、等效应力和热力学的基础上 ,建立了广义的微孔损伤理论模型 ,并用于微孔长大和聚集的分析 理论分析表明 :微孔体积分数与等效应变成指数关系 ,三向应力对微孔的长大和聚集有很大的影响 笔者建立实验的模型和理论相比较 ,可以得到 :随着S值的降低 ,模型由理论模型逐渐转化为实验模型 ,S反映空洞间的相互作用 ,当S <0 .6 5时 ,随着二相粒子体积分数的增加 ,S值增加

Theoretical Analysis on Micro-Void Damage for Ductile Fracture

A general model of isotropic ductile plastic void damage is established based on a continuum void damage variable f V , the effective stress concept, and thermodynamics. It is used to analyze the growth and coalescence of micro voids. It is shown that the damage is power exponent with equivalent strain, and the triaxial stresses have large influences on the growth and coalescence of micro voids. From the comparison of the theoretical results with experimental ones,it is concluded that the model changes to experimental model from the original theoretical model with the amount of S decreasing, which reflects the effect of interaction between voids. If the amount of S is lower than 0.65,the amount of S increases with the volume fraction of second phase particles.