对加速随机疲劳试验方法的研究

A Study on the Methods of Accelerating Random Fatigue Testing

本文结合基于局部应力—应变法的疲劳寿命估算提出一种在“相对”意义上对野外实测应变信号进行删“小量”(即对疲劳影响不大的小信号分量)处理,获得用于室内随机疲劳试验的浓缩信号的方法,其中以损伤滞回环为删除单元,以相对疲劳损伤比为删除的门槛值。

Related to the fatigue life prediction based on local stress-strain theory, a new method is presented in this paper to obtain condensed signals for indoor random fatigue testing by eliminating the small events contributing little to fatigue damage from the field measured strain signals. Here, the damage hysteresis loops are taken as the eliminated elements, and the relative damage ratio as the eliminating threshold value.