【摘要】 引入参数不确定性概念,采用概率统计方法研究了疲劳裂纹扩展过程中的可靠性问题,建立了以疲劳寿命N和J积分为随机变量的疲劳裂纹扩展可靠性模型,即N J可靠性分析模型,并用Monte Carlo法模拟了J积分的分布.与已有可靠性分析模型相比较,N J模型更适合于描述疲劳裂纹扩展的可靠性问题.更多还原

【Abstract】 After introducing the concept of uncertainty, the reliability of fatiguecrack growth is investigated with the method adopted in the probabilisticstatistic calculation. Moreover, a reliabilityanalysis model named as NJ model is established by taking fatigue life N and Jintegral as random variables and the distribution of Jintegral is simulated with MonteCarlo method. In conclusion, the NJ reliabilityanalyzing model is more suitable for describing the fatiguecrack growth than other models.更多还原