X80管道环焊缝GTN损伤模型参数标定及应用  

Parameter calibration and application of GTN damage model for girth weld in X80 pipeline

作　　者：崔忠浩 刘艳贺 王海涛[1] 罗艳龙 张新军 李仕力 周少坤 CUI Zhonghao;LIU Yanhe;WANG Haitao;LUO Yanlong;ZHANG Xinjun;LI Shili;ZHOU Shaokun(China Special Equipment Inspection&Research Institutel/Technology Innovation Center of Oil and Gas Pipeline and Storage Equipment Safety for State Market Regulation;College of Mechanical and Transportation Engineering,China University of Petroleum(Beijing))

机构地区：[1]中国特种设备检测研究院·国家市场监管技术创新中心(油气管道与储存设备安全),北京市100029 [2]中国石油大学(北京)机械与储运工程学院

出　　处：《油气储运》2024年第9期1022-1030,共9页Oil & Gas Storage and Transportation

基　　金：中国特种设备检测研究院科研基金研究项目“高钢级天然气管道焊接及检测评价研究”2020内02。

摘　　要：【目的】数值模拟方法在研究高钢级油气管道的损伤演化行为方面发挥了重要作用。然而,模拟结果的准确性往往受损伤模型参数精确度制约,确定准确的损伤参数既是保证模拟结果准确性的必要条件,也是分析工作的难点所在。【方法】通过材料拉伸试验、数值模拟、响应面法相结合的有限元反向标定法,建立不同孔洞体积分数与反映材料弹塑性变形以及损伤断裂行为的特征参数之间的拟合关系,实现对X80管道环焊缝GTN(Gurson-Tvergaard-Needleman)损伤模型参数的有效标定;利用该参数标定结果对材料的拉伸试验过程进行数值反演,通过比较仿真与试验结果的断口特征及应力-应变曲线完成对模型参数精度的验证;同时,基于上述GTN损伤模型对X80管道环焊缝的单边缺口拉伸和单边缺口弯曲试验过程进行数值模拟及结果分析,从而完成针对该GTN损伤模型的适用性验证。【结果】在参数标定结果精度验证方面,完成参数标定后的仿真呈现出的断口位置以及断裂特征与试验结果相符合,其应力-应变曲线在整个损伤断裂过程中存在良好的一致性,通过对比抗拉应力、抗拉应变、断裂应力及断裂应变4个特征点的差值后发现,两者存在的最大误差不超过10%;在模型适用性验证方面,单边缺口拉伸试样、单边缺口弯曲试样所对应表观韧性值分别为0.3993、0.3242,两者所对应的最终转化率约为1.23。【结论】参数验证结果证实了所提出GTN模型及其参数标定方法在X80管道环焊缝损伤演化行为预测方面的有效性,同时,基于该GTN模型所搭建的小尺寸断裂韧性试验模型数值模拟结果验证了不同试样之间由于裂尖拘束度影响所造成的断裂韧性的差异性问题,试验结果进一步说明了该GTN模型在X80高钢级油气管道损伤断裂领域具有较强的应用价值。(图9,表3,参28)[Objective]Numerical simulations represent an important approach to studying the damage evolution behaviors of oil and gas pipelines constructed using high-grade steel.However,the accuracy of simulation results is often restricted by the precision of damage model parameters.Accurately determining damage parameters,being a challenge in the analysis process,is vital to ensure the accuracy of simulation results.[Methods]This study established a fitting relationship between different pore volume fractions and characteristic parameters reflecting material behaviors upon elastic-plastic deformations and damage fractures,through a finite element inverse calibration method integrating material tensile experiments,numerical simulations,and the response surface method,to effectively calibrate the parameters of the Gurson-Tvergaard-Needleman(GTN)damage model for the girth welds in X80 pipelines.The tensile experiment process was numerically inverted,using the calibrated parameters,and the precision of this model was subsequently verified by comparing the fracture characteristics and stress-strain curves between simulation and experimental results.Based on the above-mentioned GTN damage model,numerical simulations and result analysis were conducted for the single edge notch tensile and single edge notch bending experimental processes for the girth welds in X80 pipelines,verifying the applicability of this GTN damage model.[Results]The accuracy verification of calibrated parameters indicated alignment between the fracture positions and fracture characteristics presented by simulations after parameter calibration and the experimental results,and high consistency of their stress-strain curves throughout the damage and fracture process.A comparison of the four characteristic values of tensile stress,tensile strain,fracture stress,and fracture strain resulted in a maximum error not exceeding 10%.In the applicability verification for the model,the apparent toughness values of single edge notch tensile and single edge notch bending

关 键 词：X80管线钢 环焊接头 损伤模型 响应面法 断裂韧性 

分 类 号：TE88[石油与天然气工程—油气储运工程]