| 热载荷下梯度结构硬质合金的弹塑性响应 |
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| 引用本文： | 黄自谦,李传新.热载荷下梯度结构硬质合金的弹塑性响应[J].东南大学学报,2013(4):463-466. |
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| 作者姓名： | 黄自谦 李传新 |
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| 作者单位： | [1]东南大学物理系,南京211189 [2]广西师范学院物理系,南宁530001 [3]荆楚理工学院数理学院,荆门448000 |
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| 基金项目： | The National Natural Science Foundation of China （ No. 50323008, 31070517）, Scientific Research Foundation of Guangxi Education Department （ No. 201203YB097）. |
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| 摘 要： | 采用有限元方法模拟了热载荷下梯度结构硬质合金的弹塑性响应．样品几何模型为二维梯度结构的轴对称圆柱体．通过引入约束因子构建了梯度材料的弹塑性本构方程．数值模拟表明：当材料温度从初始无应力的800℃下降到0℃时，在样品表面出现了压应力而在富钴区出现了拉应力；表面压应力的最大值为254MPa，富钴区拉应力的最大值为252MPa；在钴相浓度差等于或大于0．3时，钴相梯度区出现了明显的塑性流动；当温度从0℃上升到800℃时，总的塑性应变达到0．0014．塑性流动有利于降低材料内部的热应力集中．
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| 关 键 词： | 梯度结构硬质合金 有限元方法 约束因子 弹塑性响应 |
Elastoplastic response of functionally graded cemented carbides due to thermal loading |
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| Huang Ziqian Li Chuanxin.Elastoplastic response of functionally graded cemented carbides due to thermal loading[J].Journal of Southeast University(English Edition),2013(4):463-466. |
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| Authors: | Huang Ziqian Li Chuanxin |
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| Institution: | Huang Ziqian Li Chuanxin ( 1 Department of Physics, Southeast University, Nanjing 211189, China) (2College of Physics and Electronic Engineering, Guangxi Teachers Education University, Nanning 530001, China) (3 College of Mathematics and Physics, Jingchu University of Technology, Jingmen 448000, China) |
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| Abstract: | Finite dement formulations are used to simulate the evolution of the elastoplastic response of functionally graded cemented carbides （FGCC） due to thermal loading. The geometry of specimens is an axisymmetric solid cylinder with a two-dimensional gradient. The elastoplastic constitutive relationship is developed by constraint factors. Numerical results show that compressive stresses occur in the surface zone and tensile stresses in the cobalt rich zone when the temperature drops from the initial stress-free temperature of 800 to 0℃. The maximum value of the surface compressive stress is 254 MPa and the maximum value of the tensile stress is 252 MPa in the cobalt rich zones. When the cobalt concentration difference in the specimens is equal to or greater than 0.3, there is pronounced plastic flow in cobalt rich zone. When the temperature heats up from 0 to 800 ℃, the total plastic strain reaches 0.001 4. Plastic flow has a significant effect on the reduction of thermal stress concentration. |
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| Keywords: | functionally graded cemented carbides finite element method constraint factors elastoplastic response |
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