硬化材料平面应变Ⅰ型裂纹尖端塑性损伤场

Mode I Crack-Tip Plastic Damage Field in Harding Materials

用损伤力学和断裂力学相结合的方法，研究了硬化材料平面应变Ⅰ型裂纹尖端的塑性损伤场。首先引入了一个新的能同时反映变形和三轴应力约束对破坏影响的一般韧性损伤模型。然后用非耦合算法，求得了Ⅰ型裂纹损伤区的形状和大小，给出了裂尖损伤分布的解析表达式，并以Ｃ－Ｍｎ钢和ＤＥ３６钢为例做了具体分析，获得了一些有意义的结果。

Damage mechanics and fracture mechanics are used to study the mode I crack-tip plasticdamage field of harding materials. A new continuum damage model for ductile fracture is introduced first,which can describe the effects of deformation and triaxial stress constraint onfailure.Then Crack-tip damage zone and the solution of crack-tip damage field are derived byuse of uncoupled approach. Typical examples for C -Mn and DE36 steels are presented, andsome interesting results are obtained.