粘塑性金属材料蠕变实验及流变模型研究  

RESEARCH ON CREEP EXPERIMENTS AND RHEOLOGICAL MODEL OF VISCO-PLASTIC METAL MATERIALS

作　　者：罗迎社[1] 杨柳[2] 余敏[1] 马敏伟[1] 

机构地区：[1]中南林业科技大学流变力学与材料工程研究所,长沙410004 [2]浙江农林大学园林学院,临安311300

出　　处：《固体力学学报》2011年第2期142-148,共7页Chinese Journal of Solid Mechanics

基　　金：人力资源与社会保障部留学回国人员科技活动择优资助项目(林才培字[2010]30号);高等学校博士学科点专项科研基金资助项目(200805380004);湖南省自科基金项目(03JJY3007);湖南省优秀博士学位论文专项奖励项目(湘财教指[2003]48号);湘潭大学"低维材料及其应用"教育部重点实验室项目(KF0607)资助

摘　　要：对固体金属材料Lc4铝合金、TC11钛合金及优质碳素结构钢(20#、35#)在高温下进行了多组蠕变实验,对电沉积镍薄膜在常温下进行了多组加、卸载和蠕变实验,根据实验曲线,采用修正的Burgers流变模型来描述这些材料的蠕变行为,建立了积分型蠕变本构方程和微分型应力应变本构关系,确定了蠕变积分核函数,并对由蠕变方程推导的理论结果和实验结果进行了比较,理论值与实验值吻合较好.同时,利用蠕变实验数据,求出了粘塑性材料本构方程中表征粘性性质的材料常数γ〈(F)〉,并对前者在高温下的粘性系数进行了比较;对后者在常温下的多组加、卸载和蠕变实验曲线进行了力学特征分析.The creep experiments have been done on Lc4 aluminum alloy,TC11 titanium alloy,the carbon constructional quality steels（20 steel,35 steel） under high temperature,and on electro deposited nickel thin film under room temperature.The integral creep constitutive equation and differential stress-strain constitutive relationship can be established according to relevant rheological model named revised Burgers and the integral core of the creep has been achieved through the experiments.Comparing the calculation results conducted from the model with the experiment results,they were in good agreement.Moreover,the coefficient γ〈（F）〉 related with viscosity of visco-plastic materials were obtained through creep experiments＇ datum.The viscosity coefficients under high temperature of the former three kind of materials were compared;and the mechanical characteristics of the loading,unloading and creep caves under room temperature of the electro deposited nickel thin film were also analyzed.

关 键 词：粘塑性材料 高温蠕变 金属 流变模型 粘性系数 

分 类 号：O345[理学—固体力学]