摘要
构件中裂纹产生和发展的过程实质上也是抗力衰减的过程。本文首先在断裂力学的基础上确定了剩余抗力与裂纹扩展尺寸的关系。然后，在随机振动理论和裂纹扩展随机模型的基础上，分别考虑载荷的随机性、裂纹扩展的随机性以及综合考虑这两种随机性，相应地导出了裂纹扩展尺寸与剩余抗力的统计矩计算公式。最后，通过适当的假设，可以确定构件剩余抗力的分布，从而为结构的服役可靠度分布和结构的维修与巩固决策提供了初步的基础。
The generation and propagation process of crack in a member is in fact the reducing process ofmember resistance。In this paper,by means of the method of fracture mechanics,a relationship between residualresistance and crack length was established Then,on the basis of random vibration theory and stochastical modelof crack propagation,the formulas for statistical moments of crack length and residual resistance were derived byrespeclively taking the randomness of dynamic Ioad,randomness of crack propagation and both together into con-siderat ion。 Finally,the probability distribution of residual resistance was obtained under a suitable hypothesis。Therefore. this paper will provide a preliminary basis for the service reliability analysis and making decision ofmaintenance and strengthening of structures.
出处
《机械强度》
CAS
CSCD
北大核心
1994年第3期46-51,共6页
Journal of Mechanical Strength
基金
国家自然科学基金
