Identification of the constitutive equation by the indentation technique using plural indenters with different apex angles
Identification of the constitutive equation by the indentation technique using plural indenters with different apex angles
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DOI：
10.1557/jmr.2001.0314
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发表时间：
2001-08-01
影响因子：
2.7
通讯作者：
Ioka, I
中科院分区：
文献类型：
--
作者：
Futakawa, M;Wakui, T;Ioka, I
本文介绍了一种利用多个不同顶角的压痕技术确定弹塑性材料本构方程的新技术。用有限元方法分析了屈服应力、加工硬化系数、加工硬化指数和压头顶角对压痕试验载荷-深度曲线的影响。建立了描述屈服应力、加工硬化系数和加工硬化指数之间关系的特征曲线。根据特征曲线与载荷-深度曲线所给出的硬度之间的关系，对本构方程的常数进行了识别。通过在Inconel600和铝合金上的实验，验证了该技术的有效性。将所确定的本构方程应用于有限元分析，模拟了单轴拉伸下的变形，包括颈缩行为。分析结果与实验结果吻合较好。
This paper describes a novel technique for determining the constitutive equation of elastic-plastic materials by the indentation technique using plural indenters with different apex angles. Finite element method (FEM) analyses were carried out to evaluate the effects of yield stress, work hardening coefficient, work hardening exponent, and the apex angle of indenter on the load-depth curve obtained from the indentation test. As a result, the characterized curves describing the relationship among the yield stress, work hardening coefficient, and the work hardening exponent were established. Identification of the constants of a constitutive equation was made on the basis of the relationship between the characterized curves and the hardness given by the load-depth curve. This technique was validated through experiments on Inconel 600 and aluminum alloy. The determined constitutive equation was applied to the FEM analyses to simulate the deformation including necking behavior under uniaxial tension. The analytical results are in good agreement with experimental results.