Gleeble3500热模拟试验构建本构方程的速率及温度修正研究  

Rate and temperature correction for constructing constitutive equation by Gleeble3500 thermal simulator

作　　者：田伟[1,2] 李红斌[1,2] 郑明月[1,2] 徐树成[1,2] 

机构地区：[1]河北联合大学冶金与能源学院,河北唐山063009 [2]河北省现代冶金技术重点实验室,河北唐山063009

出　　处：《兵器材料科学与工程》2014年第1期90-94,共5页Ordnance Material Science and Engineering

摘　　要：利用Gleeble3500热模拟试验机进行材料的高速(应变速率大于1 s-1)试验时,由于采用的stroke模式导致速率偏离目标速率以及塑性功转化热在短时间内散发不出去,使试样温度偏离设置温度、材料变形偏离目标变形条件。为构建材料真实变形条件下的本构方程,通过分析速率及温升与应变之间的关系,在传统本构方程的基础上构建了带有速率修正和温度弹跳的本构方程模型。结果表明,修正后的本构方程具有较高的预测精度。The high speed hot compression experiment was carried out using Gleeble3500 thermal simulator. The rate deviates from the target rate due to the stroke model and the heat from plastic energy does not circulate out in a short time, which leads to the specimen temperature deviating from the set temperature, so the material conditions deviate from the target deformation conditions. In order to construct the material constitutive equation of real deformation condition, the relationship among the actual strain rate and deformation temperature and strain was analyzed. The material constitutive equation was constructed with rate correction and temperature compensation on the basis of conventional constitutive equations. The experimental results indicate that the accuracy of constitutive equation is improved.

关 键 词：热压缩变形 本构方程 速率修正 温度弹跳 

分 类 号：TG142[一般工业技术—材料科学与工程]