摘要
本文对抽油杆材料20CrMo钢近门槛区疲劳裂纹的扩展规律进行了实验研究。同时进行了概率分析。认为Paris公式中的c服从对数正态分布,n服从正态分布,裂纹深度a原从正态分布,循环次数N服从对数正态分布,并求出了与剩余寿命有关量的点估计和区间估计。
In this paper, the extending law of the endurance crack approaching threshold hasbeen researched experimentally, and meanwhile the probability analysis has been accom-plished. We think that, in Paris formula, c obeys log-normal distribution, n and thecrack depth a obey normal distribution, the circulating time N obeys log-normal distri-bution. The point estimation and interval estimation of the quantities related to residuallifetime have been solved.
出处
《大庆石油学院学报》
CAS
北大核心
1993年第1期78-83,共6页
Journal of Daqing Petroleum Institute
关键词
抽油杆
疲劳裂纹
材料
概率分布
sucker rods
fatigue crack
extending law
residual lifetime
