多级载荷作用下剩余强度模型的结构元件疲劳可靠性分析  

Analysis of the Fatigue Reliability for Structural Element under Multi-level Loads Based on the Residual Strength Model

作　　者：李少宏[1,2] 陈建军[1] 方永锋[1] 

机构地区：[1]西安电子科技大学机电工程学院,西安710071 [2]榆林学院能源动力学院,榆林719000

出　　处：《机械科学与技术》2013年第6期791-795,共5页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金项目(51175398)资助

摘　　要：对于多级载荷作用下的结构元件,利用剩余强度模型分析其疲劳可靠性问题。首先运用等强度退化量原理推导出多级载荷下的剩余强度模型公式,并从此公式出发利用矩法得到剩余强度随载荷循环数下的均值和方差,其中考虑了等效作用次数的随机性。最后利用得到的剩余强度的数字特征,基于其满足正态分布的假设,根据一次二阶矩法计算出结构元件的疲劳可靠度。通过算例考察了本文方法的可行性和有效性。For structural element under multilevel loads, the fatigue reliability has been analyzed based on the re sidual strength model. Firstly, residual strength formula considered multilevel loads is derived by principle of equal strength degradation, and from this formula using moments method the mean and variance of residual strength with load cycles can be obtained, when takes into account the randomness of the number of equivalent role. Final ly, using the numerical characteristics of residual strength, based on the assumptions of normal distribution, fatigue reliability can be calculated by FOSM method. The feasibility and effectiveness of method is investigated, through an example.

关 键 词：多级载荷 剩余强度 矩法 疲劳可靠性 一次二阶矩法 

分 类 号：TH12[机械工程—机械设计及理论]