摘要
运用断裂力学方法和逐次循环法计算含初始缺陷金属结构的腐蚀疲劳裂纹扩展寿命;考虑裂纹尺寸、载荷、材料等参数的随机性,基于金属结构裂纹扩展理论,提出了一种以疲劳累积损伤ψ(a2,a1)代替裂纹长度a(N)作为功能函数的腐蚀疲劳可靠性分析方法,建立了等幅载荷谱作用下金属结构基于累积损伤的腐蚀疲劳裂纹扩展可靠性评估模型和基于Monte-Carlo法的可靠度计算方法。结合金属连接件耳片结构进行具体计算,探讨了LY12CZ和30CrMnSiA两种材料腐蚀疲劳可靠性的差异,可为工程设计提供有益参考。
Aimed at calculating alloy structure fatigue life and reliability in corrosive environment, fracture mechanics is applied for studying fatigue crack propagation of alloy structure which contains defects, and corrosion fatigue crack propagation life is calculated by cumulating method. Using structural reliability analysis method, considering the randomness of crack size, load and material parameters with probabilistic method, evaluation model for corrosion fatigue crack propagation reliability based on cumulative damage function and calculation method based on Monte-Carlo is given for metal structure under amplitude load. Taking alloy lug as an example, its corrosion fatigue life and reliability are calculated using above-mentioned method. Furthermore, different materials（LY12CZ and 30CrMnSiA） are discussed to discover the influence of material for corrosion fatigue reliability. The method has certain reference value for engineering practice.
出处
《机械设计》
CSCD
北大核心
2014年第8期97-100,105,共5页
Journal of Machine Design
基金
航空基金资助项目(2008ZA53006
2006ZD53050)
关键词
腐蚀疲劳
裂纹扩展
剩余寿命
可靠性
连接件
corrosion fatigue
crack propagation
residual life
reliability
joint
