有限体积法的实体结构疲劳可靠性分析  

Fatigue reliability analysis of structural system based on finite volume method

作　　者：于艳春 李建操[2] 陈卫东[3] 路胜卓[3] YU Yanchun LI Jiancao CHEN Weidong LU Shengzhuo(College of Water Conservancy and Architecture, Northeast Agricultural University, Harbin 150001, China College of Geograph- ical Information and Tourism, Chuzhou University, Chuzhou 239000, China College of Astronautics and Architectural Engineering, Harbin Engineering University, Harbin 150001, China)

机构地区：[1]东北农业大学水利与土木工程学院,黑龙江哈尔滨150030 [2]滁州学院地理信息与旅游学院,安徽滁州239000 [3]哈尔滨工程大学航天与建筑工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2017年第9期1413-1419,共7页Journal of Harbin Engineering University

基　　金：国家自然科学基金青年科学基金项目(51508123);安徽省高等学校自然科学研究项目(KJ2015B06);滁州学院科研基金项目(2014QD030;2014PY04)

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 failure 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 fatigue 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 continuously 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.

关 键 词：有限体积法 疲劳可靠性 结构系统 失效模式 累积损伤 分支限界法 实体结构 失效机理 

分 类 号：TB114.3[理学—概率论与数理统计]