摘要
讨论随机载荷下构件寿命分析时的一种材料损伤计算方法。与通常采用恒幅数据计算变幅疲劳寿命的循环计数统计方法不同 ,这里针对载荷变程进行损伤计算。作为更一般性的技术 ,可以对载荷的任一变化即时计算材料发生的损伤结果。为构件局部材料的寿命分析和裂纹行为计算提供一种有效的方法 ,因为在进行逐个载荷变化的损伤模拟计算时 ,处于这些部位的应力与构件总体受力情况往往不同 。
A random fatigue damage counting method is proposed. The method is used for various fatigue life predictions under random loading with constant amplitude material fatigue data. As a more general method, reverse counting is used instead of cycle counting. The damage is counted for any changing of load level. The consideration of load serial effect and other calculations are not affected, for the counting is performed with the course of load generation and damage accumulation. It can be used for both crack propagation and lower cycle fatigue calculations reverse by reverse.
出处
《机械强度》
CAS
CSCD
北大核心
2004年第z1期32-35,共4页
Journal of Mechanical Strength
关键词
疲劳
谱载
寿命预测
雨流计数法
低周疲劳
Fatigue
Spectrum load
Life prediction
Rainflow method
Lower cycle fatigue
