考虑材料特性的管道环焊缝缺陷评估方法  

Evaluation method of defect in pipe girth considering specific material

作　　者：王旭[1] 帅健[1] 王宇[1] 罗雨菲 单克 WANG Xu;SHUAI Jian;WANG Yu;LUO Yufei;SHAN Ke(College of Safety and Ocean Engineering,China University of Petroleum-Beijing,Beijing 102249,China;Shenzhen Gas Corporation Ltd,Shenzhen Guangdong 518049,China)

机构地区：[1]中国石油大学(北京)安全与海洋工程学院,北京102249 [2]深圳市燃气集团股份有限公司,广东深圳518049

出　　处：《中国安全科学学报》2020年第7期78-84,共7页China Safety Science Journal

基　　金：国家重点研发计划项目(2016YFC0802105);中国石油化工股份有限公司科研基金资助(318022-8)。

摘　　要：为评估管道环焊缝缺陷评价方法的适用性,处理不同等级钢管拉伸性能数据,获取对应的Ramberg-Osgood模型参数,得出基于材料特性的不同等级钢管的失效评定曲线;开展拉伸试验,并结合数字图像相关法(DIC),获取跨焊缝材料不同区域的材料性能,形成基于实测数据的适用于管道环焊缝缺陷评估的失效评定曲线。研究结果表明:当载荷比小于等于0.7时,随着载荷比的增大,不同等级钢管的失效评定曲线接近重合;当载荷比介于0.7和1.0之间时,随着载荷比的增大,高等级钢管的失效评定曲线的安全区域增大,即钢管等级的提升能够提高含缺陷管道的安全裕度;基于实测数据形成的失效评定曲线更能反映材料的性能差异,特别是在管道焊接的低匹配情况下,宜优先采用焊接材料的实测拉伸性能绘制失效评定曲线。In order to evaluate the applicability of the evaluation method of pipeline girth weld defects,the Ramberg-Osgood model parameters were obtained by processing the data of tensile test for different grades of pipeline steel.The failure assessment curves of pipeline steels with different grades based on material properties was established.The stress-strain curves of the girth welds were drawn by the digital image correlation(DIC)technique applying.The failure assessment curves evaluating the girth weld defected pipelines was formed.The research shows that,when the load ratio is less than 0.7,the failure assessment curves of pipeline steels of different grades are basically the same with load ratio increasing.When load ratio is between 0.7 and 1.0,the acceptable zone of failure assessment curve of high grade pipeline steel is larger.In other words,the improvement of pipeline steel grade can promote the safety margin of defected pipelines.The failure assessment curves based on test data can better reflect the performance difference of the material,which should be prior used in the assessment of low matched welded joint of pipeline.

关 键 词：管道 材料特性 失效评定图(FAD) 环焊缝缺陷 安全评估 

分 类 号：X944.4[环境科学与工程—安全科学]