不同加载路径对铸钢材料损伤累积效应的影响  

Effect of Different Loading Paths on Damage Accumulation in Cast Steel Materials

作　　者：芦燕 郝光钦[2] 韩庆华 黄倩文[2] 黄进 Lu Yan;Hao Guangqin;Han Qinhua;Huang Qianwen;Huang Jin(Key Laboratory of Coast Civil Structure and Safety of Ministry of Education(Tianjin University),Tianjin 300072,China;School of Civil Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]滨海土木工程结构与安全教育部重点实验室(天津大学),天津300072 [2]天津大学建筑工程学院,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2019年第A02期114-119,共6页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金资助项目(51525803,51778411)

摘　　要：为了研究铸钢材料G20Mn5QT在不同循环荷载下的力学性能,进行了不同加载路径下铸钢材料的滞回性能试验,并利用ABAQUS通过调用编写的材料本构用户子程序VUMAT对铸钢材料滞回性能试验进行数值模拟,结果表明:铸钢材料G20Mn5QT在应变幅增加的加载路径下体现出Masing特性,在应变幅下降的加载路径下体现出非Masing特性,应变幅循环交替增加对铸钢材料G20Mn5QT损伤累积的影响比应变幅逐渐增加的影响大;应变幅循环交替下降对铸钢材料G20Mn5QT损伤累积的影响比应变幅逐渐下降的影响大.加载前期较小应变幅加载对铸钢材料G20Mn5QT损伤累积影响小,加载前期较大应变幅加载对铸钢材料G20Mn5QT损伤累积影响大.In order to study the mechanical behavior of cast steel G20Mn5QT under different cyclic loadings,hysteretic behavior tests of individual specimens were carried out.Using ABAQUS,the hysteretic behavior of the cast steel was numerically simulated by calling the user subroutine VUMAT.Results showed that cast steel G20Mn5QT exhibits the Masing property under an increased-strain amplitude loading path.Under a reduced-strain amplitude loading path,cast steel G20Mn5QT exhibits a non-Masing property.The effect of alternating strain amplitude cycles on the cumulative damage of the material was greater than the gradual increase in strain amplitude.The effect of an alternate decrease of strain amplitude on the cumulative damage of the material was greater than that of a gradual decrease in strain amplitude.The smaller cumulative strain amplitudes in the early stages had little effect,while the earlier,larger strain amplitudes had a great effect on the cumulative damage of cast steel G20Mn5QT.

关 键 词：铸钢 加载路径 滞回性能试验 滞回曲线 损伤累积 VUMAT子程序 

分 类 号：TG115.5[金属学及工艺—物理冶金]