摘要
借助于大型有限元计算软件ANSYS,根据雨流计数原理,分别采用Goodman、Soderberg、Gerber、Mean Stress Curve和无平均应力理论对含有裂纹的油气集输管道进行了疲劳寿命数值模拟。Mises等效应力结果表明了最大应力集中于裂纹扩展方向的尖点位置,该处的疲劳可靠性最差,其次为裂纹周边的其他区域。五种平均应力理论的疲劳计算结果表明,Goodman和Soderberg在疲劳寿命计算方面的结果一致性较好,偏安全;Gerber和平均应力曲线理论的疲劳计算结果接近,不考虑平均应力的疲劳计算结果偏非保守。
With the help of large-scale finite element calculation software ANSYS,and in accordance with the rain flow counting principle, Goodman,Soderberg, Gerber, Mean Stress Curve and none-mean stress theory were respectively adopted to make a numerical simulation of the fatigue life of cracked oil-gas gath- ering and transmission pipeline mises equivalent tress result indicated that the maximum stress concentrat- ed on the cuspidal point of cracks＂ spreading direction where the fatigue reliability is the worst, then fol- lowed by other regions around the cracks. According to the fatigue results calculated based on the five aver- age stress fatigue theories,it was indicated that Godman and Soderherg have better result consistency and are much safer in fatigue life calculation;Gerder and Mean Stress Curve theory have close results in fatigue calculation,without taking the non-conservative fatigue result of mean stress into consideration.
出处
《甘肃科学学报》
2015年第6期64-67,78,共5页
Journal of Gansu Sciences
基金
国家质检公益项目(201210026
201310152)
甘肃省高等学校基本科研业务费(1205ZTC067)
关键词
疲劳
管道
裂纹
雨流
应力
Fatigue
Pipeline
Cracks
Rain flow
Stress
