作者：马德军¹, 王家梁¹, 肖富君², 孙亮¹, 黄勇¹

作者单位：1. 装甲兵工程学院机械工程系, 北京 100072;
2. 总装备部南京军事代表局, 江苏 南京 210024

关键词：仪器化压入;维氏硬度;有限元数值分析;理论准确度

摘要：

针对仪器化压入测试识别材料维氏硬度的精度问题,该文采用有限元数值分析方法获得不同材料的维氏硬度理论计算值,以此为基础,分别对仪器化压入识别材料维氏硬度的3种代表性方法ISO方法、Kang方法和Ma方法进行理论精度分析,并进行实验验证。结果表明:1)3种方法识别的维氏硬度理论误差均随材料比功We/Wt增加呈先减小后增大的趋势;其中,ISO方法识别的维氏硬度值相比理论值普遍偏大,Kang方法识别的维氏硬度值相比理论值均偏小。2)Ma方法基于仪器化压入识别材料维氏硬度的理论误差最小,理论准确度相对较高。3)当被测材料的材料比功在0.01 We/Wt 0.3时,对应和n不同取值下的3种方法各自识别的维氏硬度误差值较为离散;当0.3 We/Wt 0.85时则较为集中。该文工作,为下一步研究维氏硬度仪器化压入新方法提供一定的理论基础。

Study on the accuracy problems for identifying the vickers hardness by instrumented indentation method

MA Dejun¹, WANG Jialiang¹, XIAO Fujun², SUN Liang¹, HUANG Yong¹

1. Department of Mechanical Engineering, Academy of Armored Force Engineering, Beijing 100072, China;
2. Nanjing Military Representative Bureau, General Armament Ministry, Nanjing 210024, China

Abstract: To analyize the accuracy in identifying the material's Vickers hardness by instrumented indentation, the finite element analysis method was adopted to obtain the theoretical values of Vickers hardness of different materials. The theoretical accuracy of three representative instrumented indentation methods (ISO method, Kang method and Ma method) for identifying material's Vickers hardness were analyzed respectively and verified experimentally. The results show that, 1)The theoretical errors of the three methods in identifying material's Vickers hardness have all been decreased at first and then increased with W_e/W_t. Among them, the Vickers hardness identified by the ISO method is generally larger than the theoretical value, and that identified by the Kang method is generally smaller than the theoretical value. 2)The theoretical error in Vickers hardness identified by the Ma method is the smallest but its theoretical accuracy is relatively higher compared with the other two methods. 3)When 0.01< W_e/W_t< 0.3, the theoretical errors in Vickers hardness indentified by these three methods are different as different η and n values are taken. When 0.3< W_e/W_t< 0.85, the theoretical errors are closer to each other. The analytic comarision of this paper has served as a theory basis for studying the new instrumented indentation for identifying Vickers hardnesses.

Keywords: instrumented indentation;vickers hardness;numerical analysis of finite element;theoretical accuracy

2015, 41(10): 6-12  收稿日期: 2014-12-16;收到修改稿日期: 2015-02-17

基金项目: 军队科研计划项目(2014CJ011)

作者简介: 马德军(1964-),男,山东烟台市人,教授,博士生导师,主要从事机械力学性能测试方法研究。

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