摘要
基于稳定循环应力下构件疲劳的σ-N曲线及不稳定循环应力下的Palmgren-Miner疲劳线性累积法则,讨论了窄带平稳随机应力环境下构件疲劳寿命的计算方法,利用给定应力谱的随机应力作用下应力峰值的概率分布导出了累积疲劳的计算公式,并指明了其适用范围和应用意义。
On the basis of σN curve of the fatigue of component under stable circulative stress and the rule of Palmgren- Miner linear fatigue accumulation under unstable circulative stress, a computation method of fatigue life of components un- der the circumstance of narrow banded stable stochastic stress was discussed. Utilizing the possibility distribution of the peak value of stress under the effect of stochastic stress of a given stress spectrum the calculation formula for accumulated fatigue was derived and its suitability range and significance of application were pointed out.
出处
《机械设计》
CSCD
北大核心
2005年第11期29-31,共3页
Journal of Machine Design
基金
湖北省自然科学基金计划资助项目(2003ABA023)
关键词
疲劳寿命
随机应力
应力谱密度
峰值分布
fatigue life
stochastic stress
density of stress spectrums distribution of peak value
