复合型裂缝应力强度因子与能量释放率的关系  

Relationship Between Stress Intensity Factor and Strain Energy Release Rate of Ⅱ- Ⅲ Mixed Mode Cracks

作　　者：吴京[1] 王向东[1] 朱小婷[1] 

机构地区：[1]河海大学力学与材料学院,江苏南京210098

出　　处：《济南大学学报（自然科学版）》2014年第6期425-428,共4页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金(50878077);"十一五"国家科技支撑计划(2008BAB29B03)

摘　　要：基于断裂力学理论和最大应力准则,结合单一型裂缝应力强度因子K与能量释放率G之间的关系和能量法,推导出Ⅱ-Ⅲ复合型裂缝K与G的关系公式;通过有限元软件对Ⅱ-Ⅲ复合型裂缝进行模拟,计算出Ⅱ-Ⅲ复合型裂缝的应力强度因子和能量释放率。模拟值与理论值之间的相对误差为4.44﹪,在允许范围内,验证了公式的合理性。In order to research the relationship between stress intensity factor and strain energy release rate of mixed model （ Ⅱ-Ⅲ） cracks, a formula is derived according to the relationship between stress intensity factor and strain energy release rate of the single mode fracture, which is based on the theory of fracture mechanics and the maximum stress criterion. Ⅱ-Ⅲ mixed mode fracture cracks are simulated using the finite element software and their stress intensity factors and strain energy release rates are obtained. It is shown that the difference between the simulated value and the theoretical value is only 4.44% ,which is in the allowed range. The result shows that the formula is reasonable.

关 键 词：Ⅱ-Ⅲ复合型裂缝 应力强度因子 能量释放率 

分 类 号：TV313[水利工程—水工结构工程]