摘要
为保障隔水管在海上安全作业,需要对含缺陷隔水管进行安全评估,使其在作业过程中不发生压溃、泄漏、断裂等安全事故。基于弹塑性线性硬化模型及Von Mises屈服准则,考虑拉弯内压载荷和缺陷几何尺寸的影响,建立含体积缺陷隔水管的三维有限元计算模型,分析含体积缺陷隔水管在复合载荷作用下的力学特性和安全作业区间,评价隔水管的安全性。结果表明:缺陷深度越大,含缺陷隔水管越易达到屈服;隔水管安全作业区间随着缺陷深度的增加而减小;较大的内压载荷会明显减小含缺陷隔水管安全区间范围,但是内压载荷较小时,缺陷深度对隔水管安全区间范围影响较小;弯矩载荷过大时,隔水管安全区间所承受的极限轴向载荷明显下降,但所承受的极限内压载荷变化不大。
In order to ensure safe operation of risers at sea,it is necessary to evaluate safety of those with defects so as to avoid crushing,leakage and fracture accidents.Based on elastic-plastic linear hardening model and Von Mises yield criterion,a three dimensional finite element calculation model of risers with volume defects was constructed considering influence of internal pressure load from stretch bending and geometric defect size.Then,mechanical characteristics of safety working range of these defected risers were analyzed under combined load,and their safety was assessed.The results show that the greater defect depth,the more likely these risers will yield,and along with increase of defect depth,its safety range decreases.Heavier internal pressure load would cause an obvious decrease in safety range which,however,will be slightly impacted by defect depth in case of lighter load.Moreover,when bending load is too heavy,limit axial load in riser safety zone decreases remarkably while limit internal load does not change much.
作者
方永
夏成宇
何宇航
王旭东
陈锟
黄壮
FANG Yong;XIA Chengyu;HE Yuhang;WANG Xudong;CHEN Kun;HUANG Zhuang(School of Mechanical Engineering,Yangtze University,Jingzhou Hubei 434023,China;Shale Gas Research Institute of Petro China Southwest Oil&Gasfield Company,Chengdu Sichuan 610057,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2020年第7期101-106,共6页
China Safety Science Journal
基金
国家自然科学基金资助(51405032)
西南石油大学油气藏地质及开发工程国家重点实验室资助项目(PLN201605)。
