应变硬化指数取值模型及其对钢质管道失效压力影响分析  

STRAIN HARDENING EXPONENT MODEL AND ITS INFLUENCE ON FAILURE PRESSURE OF STEEL PIPELINE

作　　者：孙明明[1,2,3] 方宏远 王念念 薛冰寒[2,3,4] 李斌 SUN Ming-ming;FANG Hong-yuan;WANG Nian-nian;XUE Bing-han;LI Bin(School of Hydraulic and Civil Engineering,Zhengzhou University,Zhengzhou,He’nan 450001,China;National Local Joint Engineering Laboratory of Major Infrastructure Testing and Rehabilitation Technology,Zhengzhou,He’nan 450001,China;Collaborative Innovation Center of Water Conservancy and Transportation Infrastructure Safety,Zhengzhou,He’nan 450001,China;Yellow River Laboratory,Zhengzhou University,Zhengzhou,He’nan 450001,China)

机构地区：[1]郑州大学水利与土木工程学院,河南郑州450001 [2]重大基础设施检测修复技术国家地方联合工程实验室,河南郑州450001 [3]水利与交通基础设施安全防护河南省协同创新中心,河南郑州450001 [4]黄河实验室(郑州大学),河南郑州450001

出　　处：《工程力学》2025年第4期197-205,共9页Engineering Mechanics

基　　金：2023年度河南省高等学校重点科研项目(23A560013);国家自然科学基金项目(52278378,52208375);“十四五”重点研发计划项目(2022YFC3801001)。

摘　　要：该文依据钢材料应变强化效应和变形失稳理论,得到了应变硬化指数数值解并明确了其对管道极限内压承载力的影响。根据完好管道实际爆破压力数据,给出了应变硬化指数适应范围。结果表明:应变硬化指数可通过屈强比和屈服应变求解得到,且数值解略小于真实值。管道硬化性能随着硬化指数n和强化系数K的增加而增强。钢材强度等级越高,硬化指数数值越小,失效应力越小。管道失效应变等于抗拉强度对应的真实应变的1/2。是否考虑钢材料应变硬化情况下,失效压力误差相差2.24%~6.08%,其中vonMises屈服对应变硬化指数取值模型更为敏感。Based on the strain hardening effect of steel materials and deformation instability theory,the numerical solution of strain hardening exponent is obtained and its influence on the ultimate internal pressure bearing capacity of pipes is clarified.According to the actual burst pressure data of intact pipeline,the applicable range of strain hardening index is developed.The results show that:the strain hardening exponent can be obtained by solving the yield ratio and yield strain,and the numerical solution is slightly smaller than the true value.The hardening performance of pipelines enhances with the increase of strain hardening exponent n and hardening coefficient K.The higher the strength grade of steel,the smaller the hardening exponent n and the lower the failure stress.The failure strain of the pipeline is equal to half of the true strain corresponding to the tensile strength.Whether or not to consider the strain hardening of steel materials,the difference between failure pressure errors is 2.24%~6.08%,in which von Mises yield is more sensitive to the computational model of strain hardening index.

关 键 词：应变硬化指数 硬化性能 失效模式 失效压力 试验数据 

分 类 号：TE973[石油与天然气工程—石油机械设备]