基于SMCS模型高强度管线钢韧性失效的预测  

Prediction of ductile failure of high-strength pipeline steel based on SMCS model

作　　者：任鹏[1] 李轩[1] 周智[1] 

机构地区：[1]大连理工大学土木工程学院,辽宁大连116024

出　　处：《油气储运》2014年第9期956-962,共7页Oil & Gas Storage and Transportation

基　　金：国家重点基础研究发展计划(973计划)资助项目"深海工程结构的极端环境作用与全寿命服役安全/深海平台结构全寿命性能监测;原型验证与安全评定";2011CB013705;国家"十二五"科技支撑重大专项"城市基础设施安全监测控制物联网技术研究及应用示范";2011BAK02B00;教育部新世纪优秀人才支持计划项目;NCET-100290

摘　　要：为确保高强度管线钢油气管道的输运安全,韧性断裂的设计与评估至关重要,考虑微结构孔洞损伤演化并有效结合宏观有限元结构分析的应力修正临界应变(SMCS)模型适用于韧性失效的预测。借鉴X80管线钢缺口试件拉伸实验数据,采用Gurson损伤模型有限元模拟了该试件的韧性起裂,结果表明:韧性起裂位置发生在试件中心;构成孔洞体积比增加的主要贡献来自孔洞扩张,孔洞形核对韧性起裂影响较小,由此验证了SMCS模型的相关假设。在此基础上,得到了该型管线钢的韧性失效指标与失效准则,该失效准则形式简单,便于工程应用。In order to ensure the transportation safety of high-strength steel oil and gas pipeline, the design and evaluation of ductile fracture is crucially important. The stress modified critical strain（SMCS） model that considers microstructure void damage evolution and effectively combines macro finite element structure analysis is applicable for ductile failure prediction. Based on the tensile experiment data of X80 pipeline steel notch specimen, its ductile cracking is simulated by finite element with Gurson damage model. The results show that ductile cracking appears at the center of the specimen, the major contribution of void volume ratio increase is from void expansion and void nucleation has low impact on ductile cracking, which verifies the related hypothesis of SMCS model. Accordingly, the ductile failure index and the failure criterion of this pipe steel are obtained. The failure criterion is formally simple and convenient for engineering application.

关 键 词：管线钢 SMCS模型 韧性失效 有限元模拟 Gurson损伤模型 

分 类 号：TE88[石油与天然气工程—油气储运工程]