考虑高温蠕变损伤的2.25Cr1Mo钢的弹塑性本构模型  

Elasto- plastic Constitutive Model of 2. 25Cr1Mo Steel Considering Initial Creep Damage

作　　者：王宁[1] 刘洪起 涂善东[1] 

机构地区：[1]华东理工大学承压系统与安全教育部重点实验室,上海200237

出　　处：《压力容器》2014年第1期1-9,14,共10页Pressure Vessel Technology

基　　金：国家自然科学基金重点项目(50835003);国家863重点项目(2009AA044803)

摘　　要：考虑造成蠕变损伤的物理机制,结合损伤力学理论,利用Ramberg-Osgood弹塑性本构方程,推导了含有蠕变损伤的材料弹塑性本构模型。对2.25Cr1Mo钢进行了相同条件不同时长的蠕变试验以得到不同蠕变损伤的材料,并对这些材料进行高温短时拉伸,得到不同损伤对应的应力应变曲线。并用试验数据及文献数据对模型进行了验证。Based on Ramberg - Osgood elasto - plastic constitutive equation and creep damage mechan- ics,the creep damage coupled elasto- plastic constitutive model of 2.25CrlMo steel was derived. Creep tests were performed on 2.25CrlMo steel to the same condition and different time periods to yield differ- ent creep damages. High temperature tensile tests were then can＇ied out on the damaged materials to ob- tain the stress - strain curves eon＇esponding to different damages. Literature data and test data are used to validate the model,and they are in reasonable agreement.

关 键 词：蠕变 损伤 弹塑性本构 应力应变曲线 

分 类 号：TH142.2[一般工业技术—材料科学与工程] TG111.8[机械工程—机械制造及自动化]