Ⅰ型裂纹尖端无位错区近场的断裂与损伤研究

A Study on the Fracture and Damage near DFZ of Model Ⅰ Crack Tip

在Ａｌ单晶Ⅰ型裂纹扩展的透射电镜观察基础上，运用微观位错理论及宏观连续损伤力学，建立了无位错区（ＤＦＺ）附近塑性区的微观断裂模型与损伤线场，并进行了数值计算．结果表明：位错密度最大处与损伤值最大处与实验观察到的微孔洞萌生位置非常接近．

Basod upon aluminium crystal dynamic observation of propagation of model Ⅰ crack tip ,with the aid of micro dislocation theory and macro continuum damage mechanics, micro fracture model and linear field of damage for plastic zone near DFZ were established and calculated numerically .Numerical calculation shows that the position where dislocation density and damage value become maximum is the same as where the void nucleated.