【摘要】 基于随机有限元,将材料和载荷等影响结构疲劳寿命的不确定因素视为随机变量,分别对结构的裂纹形成寿命和裂纹扩展寿命进行可靠性分析。将结构的疲劳寿命看成由裂纹形成寿命和裂纹扩展寿命组成的串联系统,并由此确定结构的检修周期。通过随机有限元得到的分析结果与Monte Carlo模拟结果的比较,表明此方法能给出合理的结构检修周期,具有较强的适用性。更多还原

【Abstract】 A structure economical life model based on stochastic finite element method was presented.The uncertainties such as material and loading which affect the fatigue fracture of structure were regarded as random variables.Reliability analysis was made respectively for crack initiation life and crack propagation life.The maintenance period is got when the fatigue life of structure is treated as a series system for crack initiation life and crack propagation life.From the comparisons of the outcomes of stochastic finite element method with Monte Carlo simulation results,this method proved to be feasible and applicable.更多还原