球压痕法评价材料拉伸性能的有限元分析

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The ball indentation technique is widely used for nondestructive evaluation of the tensile prop- erties of devices and materials, such as plastic stress - strain curve, yield strength and tensile strength. It has potential to monitor the progressive changes in the tensile properties to ensure the structural integrity of in - service components. In this paper, ball indentation test was performed by using a FEM （ finite ele- ment model） in both 16MnR and 17 -7PH. To verify effectiveness of the FEM, the load -depth curves of 16MnR measured by the FEM and testing machine were compared. It confirms that the FEM is reliable. Two indenters of different rigidity were used in the FEM to study the effect on indentation load -depth curve and tensile properties. The results from the FEM were verified by comparison with those from tensile test at ambient temperature. It shows good agreement between ball indentation test and tensile test.球压痕法被广泛应用于设备材料真应力应变曲线、屈服强度和抗拉强度等拉伸性能的无损测试。它有望实现对在役设备材料拉伸性能的连续性监控，用于评估在役设备的结构完整性。建立了带有两种不同刚度压头的球压痕试验有限元模型，用于研究不同刚度压头对压痕载荷深度曲线和拉伸性能结果的影响。为了验证模型的有效性，将模拟16MnR材料获得的加载曲线和试验机获得的加载曲线进行对比，对比结果表明，模型能有效地实现球压痕试验的模拟。最后取16MnR和17―7PH两种材料做球压痕试验的有限元模拟，把模拟获得的结果与在试验机上进行常规室温拉伸试验获得的结果进行对比，对比结果表明，球压痕法可以有效测量材料的拉伸性能。