循环荷载下奥氏体不锈钢的本构关系试验研究  

Experimental study on constitutive relationship in austenitic stainless steel under cyclic loading

作　　者：王元清[1,2] 常婷[1,2] 石永久[1,2] 

机构地区：[1]清华大学土木工程安全与耐久教育部重点实验室,北京100084 [2]清华大学土木工程系,北京100084

出　　处：《东南大学学报（自然科学版）》2012年第6期1175-1179,共5页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51108007);高等学校博士学科点专项科研基金资助项目(20110002130002);北京市自然科学基金资助项目(8112018)

摘　　要：为了研究不锈钢在循环荷载作用下的本构关系,对不锈钢S31608试件进行了多种循环加载试验,分析了不锈钢试件在单调荷载和循环荷载作用下的应力-应变关系.采用Ramberg-Os-good模型对循环骨架曲线进行拟合,通过试验标定得到循环强化参数,并利用有限元软件ABAQUS对试验过程进行数值模拟.试验结果表明:不锈钢材料在循环荷载作用下滞回曲线饱满,具有良好的滞回性能;随着循环次数的增加,循环硬化出现,循环后期应力提高较明显;Ram-berg-Osgood模型能够较好地对循环骨架曲线进行拟合;有限元分析得到的滞回曲线与试验结果吻合较好.因此,不锈钢在循环荷载作用下的本构关系不同于单调荷载作用下的本构关系,通过循环加载试验标定得到的循环强化参数可用于数值模拟.In order to study the constitutive relationship of the stainless steel under cyclic loading,specimens of stainless steel S31608 were tested under a variety of loading systems.The stress-strain relationships of the stainless steel under monotonic and cyclic loading were studied.The cyclic skeleton curves were fitted by using the Ramberg-Osgood model.The parameters of the hardening model of cyclic plasticity were calibrated from test data and the tests were simulated by ABAQUS.The experimental results show that the hysteretic curves of stainless steel are plump,which indicates the excellent cyclic behavior.With the increase of the cyclic loops,stainless steel exhibits cyclic hardening behavior and the stress turns greater.The Ramberg-Osgood model fits the cyclic skeleton curves well.The simulated curves obtained by ABAQUS agree well with the test curves.Therefore,the constitutive relationship of stainless steel under cyclic loading is different from that under monotonic loading and the parameters of the hardening model of cyclic plasticity which are calibrated from tests can be used in the numerical simulations.

关 键 词：不锈钢 循环加载 滞回性能 有限元分析 

分 类 号：TU391[建筑科学—结构工程]