摘要
齐次马尔可夫模型可以用于描述伪随机谱载荷下的裂纹扩展的随机过程。文中导出了用初始裂纹长度的分布及马尔可夫转移概率密度函数计算给定时刻裂纹长度分布的积分公式。建立了由实验数据估计马尔可夫转移概率密度函数的计算方法。在此基础上建立了计及裂纹检出概率的可检结构的可靠性模型。
the fatigue crack growth under the random loads is described by a time discrete Markoff process. The distribution function of crack length at given time can be calculated by integration of the initial crack length distribution and the transition function of Markoff process. The transition function can be identified with experience crack growth data. The structure reliability is calculated by intersection of the probability density function of crack length and distribution function of critic crack length. A time-dependent reliability model accounting the crack inspected probability for inspectable structure is established.
出处
《航空学报》
EI
CAS
CSCD
北大核心
1992年第3期A232-A235,共4页
Acta Aeronautica et Astronautica Sinica
关键词
结构可靠性
裂纹扩展
马尔可夫过程
reliability of structure, fatigue crack growth, Markoff process
