| 李世民,马德军*.压入硬度与材料单轴强度的关系研究[J].实验力学,2008,23(3):263~270 |
| 压入硬度与材料单轴强度的关系研究 |
| Investigation of Relationship between Material Indentation Hardness and Uniaxial Strength |
| 投稿时间：2007-09-25 修订日期：2008-04-17 |
| DOI： |
| 中文关键词: 压入硬度 屈服强度 强度极限 |
| 英文关键词:indentation hardness yield strength strengths limit |
| 基金项目:国家自然科学基金资助项目（10672185） |
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| 中文摘要: |
| 通过量纲分析和有限元数值计算，对弹塑性材料在Berkovich压头作用下的压入响应进行了分析，揭示了Oliver与Pharr压入硬度与材料屈服强度和单轴强度之和间存在简单的近似函数关系。据此，材料的屈服强度和强度极限之和可以由压入测试获得，铝合金的拉伸与压入实验证实了上述近似函数关系的正确性。基于这一关系，不仅可以利用压入技术对材料强度水平进行直接比较，而且可以预测中低强度结构钢的疲劳极限。多种碳钢和热处理钢的疲劳实验数据验证了利用压入技术预测中低强度结构钢的疲劳极限的有效性。 |
| 英文摘要: |
| Dimensional analysis and FEM （Finite Element Method）were employed to analyze indentation of elastic-plastic materials with Berkovich indenter. Results reveal that there is a simple approximate relation between Oliver and Pharr indentation hardness and the sum of the engineering yield strength and tensile strength. According to this relationship, the sum of the engineering yield strength and tensile strength can be obtained by indentation test. This argument is supported by the experimental data of stress-strain tests and indentation tests of aluminum alloys. Based on this argument, it is not only possible to compare the strength levels of two materials directly based on indentation technique, but also can be further adopted to estimate the fatigue limits of some middle or low strength structure steels. The validity of predicting fatigue limit of middle or low strength structure steel based on indentation test is supported by fatigue experiment data of some heat-treated steel and carbon steel. |
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