有限体积法的实体结构疲劳可靠性分析

摘要

为了提高实体结构系统疲劳可靠性的计算效率,本文采用有限体积法研究了实体结构系统的疲劳可靠性问题.通过依据累积损伤模型对结构元件的疲劳可靠性进行分析,建立了实体结构系统的分析模型,分析了实体结构系统疲劳失效机理和判别方法.本文利用改进的分支限界法搜索了结构系统的主要失效模式,采用简化的疲劳可靠性分析方法计算了结构系统的疲劳可靠度.通过算例分析,得到的结构系统疲劳可靠度的计算结果在简单界值法的估算范围内,且随着疲劳载荷循环次数的增加可靠度不断减小.该计算结果的趋势是正确的、符合客观实际的,证明了提出方法的正确性,为结构系统疲劳可靠性分析提供理论基础.%In this study, the finite volume method was adopted to analyze the fatigue reliability of a solid structure system and to optimize its computational efficiency.The fatigue reliability of structural elements was analyzed on the basis of the cumulative damage model.The analytical model of a solid structure system was established, and the fatigue failure mechanism of a solid structure system was analyzed.In addition, the recognition of fatigue fail-ure was explored, and the main failure modes of the structural system were investigated through the improved branch-and-bound method.The fatigue reliability of the structural system was calculated through the simplified fa-tigue reliability analysis method.The analysis of calculation examples revealed that the fatigue reliability of the structure system is within the estimation range of the simple bound-value method.In addition, reliability continu-ously decreases with increasing fatigue load cycles.The trend of the calculation results was correct and valid, thus validating the method.The proposed method provides a theoretical basis for the fatigue reliability analysis of structural systems.