机构地区: 山东大学机械工程学院
出 处: 《山东大学学报(工学版)》 2004年第6期1-3,8,共4页
摘 要: 基于断裂力学的能量释放率理论 ,研究了平面应变条件下梯度功能材料的Ⅰ ,Ⅱ型复合裂纹问题 .讨论了裂纹尖端附近的应力场和应力强度因子 ,建立了具有一般性的梯度功能材料的断裂准则即能量释放率判据 . Based on the theory of strain energy release rate of fracture mechanics, the crack problem of mixed mode Ⅰ and mode Ⅱ crack for functionally gradient materials under plane strain is investigated. Stress fields near the crack tip and stress intensity factors are discussed, and consequently a universal fracture criterion, i.e. critical strain energy release rate criterion for functionally gradient materials is presented.