Re-Examination of Correlation between Hardness and Tensile Properties by Numerical Analysis
Re-Examination of Correlation between Hardness and Tensile Properties by Numerical Analysis
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DOI：
10.1007/s11340-017-0272-4
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发表时间：
2017-06-01
影响因子：
2.4
通讯作者：
Noguchi, H.
中科院分区：
文献类型：
--
作者：
Hamada, S.;Nakanishi, M.;Noguchi, H.
接触，奇异场，和大变形的数值分析进行重新检查硬度和拉伸性能之间的相关性。材料具有单一的硬度值，但在应力-应变图中连续变化;原则上，不可能将硬度与一个应力-应变值相关联。因此，必须存在一个应用限制，这是在这项研究中进行了讨论。由于离散化误差是不可避免的，在这种分析，一个方法，无论分析条件的离散化误差的水平。此外，为了概括分析结果，用于此分析的应力-应变图被认为是一个无量纲表达式在安排的结果。根据分析结果，得出以下结论。硬度和抗拉强度之间的经验公式适用的范围仅取决于加工硬化指数的值。此外，对于0.05-0.2范围内的加工硬化指数的一般钢，从硬度的抗拉强度的预测是可能的，在110度和136度之间的压头面角的情况下的楔形压痕的10%的误差。
Contact, singular-field, and large-deformation numerical analyses were performed to re-examine the correlation between hardness and tensile properties. Materials have single hardness values, but continuous changes in stress-strain diagrams; it is impossible, in principle, to correlate the hardness to one stress-strain value. Therefore, there must exist an application limit, which is discussed in this study. Because discretization error is unavoidable in such analyses, a method for leveling the discretization error regardless of the analysis condition was introduced. Moreover, in order to generalize the analysis results, the stress-strain diagram used for this analysis was considered as a dimensionless expression in arranging the results. From the analytical results, the following conclusions were deduced. The range in which the empirical equation between hardness and tensile strength is applicable depends on only the value of the work hardening exponent. Moreover, for the 0.05-0.2 range of the work hardening exponent for general steel, the prediction of tensile strength from the hardness is possible with 10% error at indenter face angles between 110 degrees and 136 degrees in case of the wedge indentation.