摘要
为了预测复合型裂纹呈滑移型(Ⅱ型)的断裂,在此提出了复合型裂纹扩展的最大塑性区尺寸断裂判据。该准则成功地预测了金属材料复合型裂纹呈滑移型(Ⅱ型)断裂的裂纹开裂角和临界荷载,同时认为金属材料裂纹扩展的动力来源于形状改变比能的释放,与体积应变能无关。将其结果与最大剪应力准则相比,取得了较为一致的结果。因此,结果表明:该准则在预测复合型裂纹呈Ⅱ型断裂上是成功的。
In order to predict the mixed mode crack growth in sliding mode fracture, the fracture criterion of mixed mode crack growth is introduced here based on the maximum size of plastic zone near crack tip. It predicts successfully the crack initiation angle and the critical load for mixed mode growth of metal material in sliding mode fracture. Meanwhile,the motive force of crack growth in metal material comes from the deviator strain release, the volume strain energy does not contribute to crack growth. The results gained match well with those of the maximum shear stress criterion. Therefore, the present results denotes the criterion is success in predicting the mixed mode crack growth in mode-Ⅱ fracture.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2005年第4期11-14,共4页
Journal of Sichuan University (Engineering Science Edition)
关键词
复合型裂纹
滑移型断裂
塑性区尺寸
断裂准则
mixed mode crack
sliding mode fracture
size of plastic zone
fracture criterion
