硬质合金残余热应力的理论计算与数值模拟  

Theoretical Calculation and Numerical Simulation for Thermal Residual Stresses of Cemented Carbides

作　　者：黄自谦[1] 贺跃辉[1] 武从海[2] 张丽娟[1] 肖逸锋[1] 黄伯云[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083 [2]河南科技大学,河南洛阳471003

出　　处：《稀有金属材料与工程》2009年第A01期303-307,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金专项基金资助项目(50323008)

摘　　要：采用Eshelby理论计算与数值模拟相结合的方法分析了均质硬质合金内部微观应力,得到以下结论:根据Eshelby理论模型,当夹杂为椭球状时,夹杂内得到均匀的应力-应变场,且得到的结果为三轴应力,而当夹杂非理想形状时,由数值计算得出夹杂内的应力-应变场是不一致的,且夹杂内出现大的等效应力;当不考虑温度相关的材料参数时,数值模型和理论模型的结论一致,然而,当考虑温度相关的材料参数时,数值模型的结果远小于理论计算。因此,采用数值计算方法得到的结果更为精确。Microstresses of cemented carbides were analyzed by Eshelby theory calculation and numerical simulation. The calculation results show when the inclusion is ellipsoidal, the stress-strain field in inclusion is even according to Eshelby theory; however when the inclusion is not ellipsoidal, the stress-strain field in inclusion is not even according to numerical simulation; when material parameter is independent of temperature, the results of Eshelby model agree with numerical results, but when material parameter is dependent of temperature, the numerical result is less than the results of Eshelby model greatly. Thus the numerical result is more precise than that of Eshelby model.

关 键 词：硬质合金 残余应力 Eshelby模型 有限元方法 

分 类 号：TG135.5[一般工业技术—材料科学与工程]