摘要
针对连续管在作业中易出现疲劳失效等问题,进行了连续管在内压、弯扭耦合加载下疲劳寿命评估。首先分析了耦合加载下连续管低周疲劳失效机理,基于 Brown-Miller 疲劳寿命模型建立了连续管疲劳寿命数值计算模型,开展了内压和弯曲加载下连续管疲劳实验,实验结果证实该数值模型是可行的。计算了内压和弯曲耦合加载下连续管低周疲劳寿命,以及内压和弯扭耦合加载下连续管低周疲劳寿命。计算结果表明,连续管最大塑性应变和疲劳敏感区出现在轴向拉伸面和压缩面,与现场连续管失效情况是一致的。通过计算得到了连续管安全服役的临界扭矩值和内压值。
It is necessary to evaluate the fatigue life of coiled tube (CT) under the coupled load of internal pressure, bending load and torsion. First, the failure mechanism of low cycle fatigue of CT under coupling loading is analyzed. Based on Brown-Miller fatigue life model, a numerical calculation model of CT fatigue life is established. The low cycle fatigue life of CT under the coupling load of internal pressure and bending load is calculated. And also the low cycle fatigue life of CT under the load of internal pressure, bending load and torsion is calculated. The calculation results show that the maximum plastic strain and fatigue sensitive areas of CT appear on the axial tensile surface and compression surface, which is consistent with the failure of CT on oil field. The critical torque value and internal pressure of CT are obtained by calculation for CT safety service.
作者
周浩
刘少胡
管锋
ZHOU Hao;LIU Shaohu;GUAN Feng(School of Mechanical Engineering, Yangtze University, Jingzhou 434023, China)
出处
《高压物理学报》
EI
CAS
CSCD
北大核心
2019年第4期90-96,共7页
Chinese Journal of High Pressure Physics
基金
国家自然科学基金(51604039)
长江大学长江青年科技创新团队基金(2016CQT01)
长江大学青年基金(2015CQN44)
关键词
连续管
扭矩
塑性变形
疲劳寿命
耦合载荷
coiled tube
torsion
plastic deformation
fatigue life
coupling load
