作者：薛河, 李萌, 李富强, 侯鹏飞

作者单位：西安科技大学机械工程学院，陕西 西安 710054

关键词：压入试验;载荷位移曲线;材料力学特性;力学性能测试

摘要：

为深入研究压入实验在测量材料局部力学性能上的应用，采用ABAQUS有限元模拟结合压痕理论，以R-O关系为材料本构模型获得通过压痕响应获得材料硬化指数以及弹性模量的经验公式。通过结合有限元数值模拟，避免物理实验在数据测试阶段的误差，通过研究压入实验卸载段得到能够表征弹性模量的独立参量，另外新引入载荷-位移曲线在对数坐标系的表达，在压痕响应中提取出以硬化指数为单一变量的特征量，将弹性模量的计算与硬化指数独立，得到更加精确的计算结果。经过对理想数学模型以及实验数据进行验证，均能够在有效误差范围内得到合理的硬化指数及弹性模量数值。

Hardening index and elastic modulus calculation method of material based on indentation test
XUE He, LI Meng, LI Fuqiang, HOU Pengfei
School of Mechanical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China
Abstract: In order to further study the application of pressure-in experiments in the local mechanical properties of materials, using ABAQUS finite element simulation combined indentation theory, the R-O relationship as the material-based model obtained the empirical formula of material hardening index and elastic modulus obtained by indentation response. By combining finite element numerical simulation, the formula avoids the error of physical experiment in the data test stage, and obtains an independent parameter that can characterize elastic modulus by studying the unloading segment of the pressure-in experiment. In addition, the expression of the load-displacement curve in the logarithmic coordinate system is introduced, and the characteristic quantity with hardening index as a single variable is extracted in the indentation response. This method separates the calculation of elastic modulus from the hardening index, and can obtain more accurate results. After the verification of the ideal mathematical model and experimental data, a reasonable hardening index and elastic modulus value can be obtained within a reasonable error range.
Keywords: indentation test;load-displacement curve;material mechanical properties;mechanical property test
2020, 46(3):26-31,83  收稿日期: 2019-07-15;收到修改稿日期: 2019-09-18
基金项目: 国家自然基金委员会与英国皇家学会合作交流项目（5171101952）
作者简介: 薛河(1961-),男,江苏扬州市人,教授,博士生导师,主要从事重要机械结构完整性评价方面的工作
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