Effect of crack face contact on dynamic stress intensity factors for a hole-edge crack  

作　　者：盖秉政 王立清 

机构地区：[1]School of Astronautics,Harbin Institute of Technology

出　　处：《Journal of Harbin Institute of Technology(New Series)》2009年第2期194-197,共4页哈尔滨工业大学学报（英文版）

基　　金：Sponsored by the National Natural Science Foundation of China(Grant No.10272036)

摘　　要：In order to determine the dynamic stress intensity factors(DSIFs)for a single edge crack at the center hole of a finite plate under a compressive step loading parallel to the crack,the finite element method was employed to solve the cracked plate problem.The square-root stress singularity around the crack tip was simulated by quarter point singular elements collapsed by 8-node two-dimensional isoparametric elements.The DSIFs with and without considering crack face contact situations were evaluated by using the displacement correlation technique,and the influence of contact interaction between crack surfaces on DSIFs was investigated.The numerical results show that if the contact interaction between crack surfaces is ignored,the negative mode I DSIFs may be obtained and a physically impossible interpenetration or overlap of the crack surfaces will occur.Thus the crack face contact has a significant influence on the mode I DSIFs.In order to determine the dynamic stress intensity factors （DSIFs） for a single edge crack at the center hole of a finite plate under a compressive step loading parallel to the crack, the finite element method was employed to solve the cracked plate problem. The square-root stress singularity around the crack tip was simulated by quarter point singular elements collapsed by 8-node two-dimensional isoparametric elements. The DSIFs with and without considering crack face contact situations were evaluated by using the displacement correlation technique, and the influence of contact interaction between crack surfaces on DSIFs was investigated. The nu- merical results show that if the contact interaction between crack surfaces is ignored, the negative mode I DSIFs may be obtained and a physically impossible interpenetration or overlap of the crack surfaces will occur. Thus the crack face contact has a significant influence on the mode I DSIFs.

关 键 词：CRACK contact interaction dynamic stress intensity factors （DSIFs） finite element method 

分 类 号：O346.1[理学—固体力学] TG356.45[理学—力学]