CAJ | 학술논문

为了评估周期性疲劳载荷作用下的结构可靠度,设结构初始强度为服从任意分布的随机变量,推导出周期性疲劳载荷作用下的结构剩余强度表达式.利用通用生成函数法对结构剩余强度和疲劳载荷构成函数的概率特征进行计算,从而建立了周期性疲劳载荷作用下的应力-强度干涉模型.利用45#钢疲劳试验数据对提出模型的有效性进行验证和分析.结果表明,该模型能够有效地评估周期性疲劳载荷作用下的结构可靠度.
위료평고주기성피로재하작용하적결구가고도,설결구초시강도위복종임의분포적수궤변량,추도출주기성피로재하작용하적결구잉여강도표체식.이용통용생성함수법대결구잉여강도화피로재하구성함수적개솔특정진행계산,종이건립료주기성피로재하작용하적응력-강도간섭모형.이용45#강피로시험수거대제출모형적유효성진행험증화분석.결과표명,해모형능구유효지평고주기성피로재하작용하적결구가고도.
@@@@The conventional stress-strength interference (SSI) model is a basic model for reliability analysis of mechanical components. In this model, the component reliability is defined as the probability of the strength random variable larger than the stress random variable. But for a component under circular fatigue loads conditions, its reliability can not be calculated directly by using the SSI model. To evaluate the structural reliability under circular fatigue loads, an expression of residual strength under circular fatigue loads is derived firstly in the assumption that the initial strength is a random variable which follows any distribution. Then, a stress-strength interference model under circular fatigue loads is proposed by employing the universal generating function to calculate the probability characteristics of a function constituted by residual strength and fatigue loads. Finally, the fatigue experimental data of 45# steel is used to testify and analyze the proposed model. The results indicate that the proposed model can be used to evaluate the structural reliability under circular fatigue loads.