【摘要】 本文在定义对数损伤变量和相应的有效应力之后,引入了一种考虑材料内部空穴演变的裂尖损伤演变方程.随后分析了损伤对Dugdale 模型塑性区尺寸(r_?)和COD（δ）的影响,并给出了数值结果.分析表明,r（?）和δ随损伤的增加而增大.更多还原

【Abstract】 After defining a logarithm damage variable and effective stress,we introduce a damage evolution equation at crack tip bytaking into account the physical mechanism of the development ofcavities.We conclude that damage can modify the plastic zone size(r_p)and COD(δ)in the Dugdale model Numerical results are alsogiven.It is shown that the damage increases r_p and δ.更多还原