作者：石新正, 孙亮, 马德军

作者单位：陆军装甲兵学院机械工程系, 北京 100072

关键词：金属材料;压痕;塑性参数;无量纲函数关系

摘要：

在传统压入实验中引入压痕中边距与名义中边距之比d/dl，并利用量纲分析及有限元数值仿真方法确定Vickers压入硬度HV及压痕中边距与名义中边距之比d/dl与材料弹塑性参数间的无量纲函数关系，提出一种基于Vickers压痕的金属材料塑性参数压入测试方法。对已知弹性模量的金属材料，该方法可对应变硬化指数n、条件屈服强度0.2及强度极限b进行测试，对4种金属材料的压入实验结果表明，该方法对金属材料塑性参数的测试精度满足工程需要，验证方法的有效性。

Indentation test method for plastic properties of metals based on Vickers indentation impression

SHI Xinzheng, SUN Liang, MA Dejun

Department of Mechanical Engineering, Academy of Army Armored Force, Beijing 100072, China

Abstract: A method for determining the plastic parameters of Vickers indentation metals was proposed by introducing the ratio of the center-to-border distance of indentation impression to the nominal center-to-border distance d/d_l in traditional indentation test. Based on the dimensional analysis and finite element simulation, the dimensionless relationships between two independent indentation response parameters (the ratio of the center-to-border distance of indentation impression to the nominal center-to-border distance and the Vickers indentation hardness) and the elastic-plastic parameters were established. As for metals with known elastic modulus, this method can determine the strain hardening exponent n, offset yield strength σ_0.2 and ultimate strength σ_b. Indentation tests on 4 metals showed that, the test accuracy of this method on plastic parameter of metals satisfied the engineering demand, thus manifesting the validity of the proposed method.

Keywords: metals;indentation impression;plastic properties;the dimensionless relationships

2018, 44(9): 141-147  收稿日期: 2018-01-14;收到修改稿日期: 2018-03-01

基金项目: 

作者简介: 石新正(1993-),男,山东日照市人,硕士研究生,专业方向为材料力学性能测试

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