高强度管线钢裂纹扩展速度的计算  

Calculation of crack extension rate of high-strength pipeline steel

作　　者：涂圣文[1] 帅健[1] 

机构地区：[1]中国石油大学(北京),北京102249

出　　处：《油气储运》2015年第4期383-387,共5页Oil & Gas Storage and Transportation

摘　　要：裂纹扩展速度是预测管线钢止裂韧性的重要参数。根据目前世界各国全尺寸爆破试验分析总结的裂纹扩展速度计算模型,即BTCM模型、HLP模型和Sumitomo模型,对X80管线钢的裂纹扩展速度进行了计算,研究了管径、壁厚和强度对裂纹扩展速度的影响。分析发现,HLP模型和Sumitomo模型计算裂纹扩展速度与高强度钢全尺寸爆破实测数据较为一致,而BTCM模型预测数据较实测结果偏离程度较大。采用3种模型的计算结果表明:当管道壁厚和强度增加时,最大裂纹扩展速度均减小,因而有利于管道止裂;管径增加,最大裂纹扩展速度增大,管道所需止裂韧性也相应增大。Crack extension rate is one of the important parameters to predict arrest toughness. Based on the calculation models of crack extension rate worked out through full-size explosion tests in the world, that is, BTCM model, HLP model and Sumitomo Model, the crack extension rate of X80 pipeline steel has been calculated, and the influences of diameter, wall thickness and strength on crack extension rate have been studied. The results show that the crack extension rates calculated by HLP model and Sumitomo model are consistent with the measured data through full-size explosion of high-strength steel, while the predicted data of BTCM model deviated greatly from such measured data. The calculation results with BTCM model, HLP model and Sumitomo model indicate that along with the increase of wall thickness and strength, the maximum crack extension rate decreases, thereby helping to stop the cracking of pipeline; when pipeline diameter increases, the maximum crack extension rate increases, which accordingly demands higher arrest toughness.

关 键 词：裂纹扩展速度 高强度管线钢 BTCM模型 HLP模型 Sumitomo模型 

分 类 号：TE89[石油与天然气工程—油气储运工程]