Abstract The study presents the analysis of the contour plots obtained from nanoindentation grids conducted on CuZn40Pb2 brass and W-Cu, which are heterogeneous materials having different microstructure and mechanical properties. The aim is to increase the detection capacity of the mechanical properties of the phases respect to the statistical analysis, but also to propose a formulation for the inverse analysis of nanoindentation data allowing the full elastoplastic characterization. Analysis of contour plots provides curves where the mean value of the phases and the bulk value can be read directly. In complex microstructures, this gives access to the predominant mechanical properties facilitating the interpretation of the results. The estimation of the phase fractions by this proposed method is better than the estimation performed with statistical analysis. The estimation of the standard deviation is equivalent to the statistical analysis in most cases; however the difference is large on skewed distributions. The formulation of the objective function for inverse analysis is able to manage large number of indentations, producing elastoplastic parameters with excellent accuracy compared to parameters identified by tensile test.

中文翻译：

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一种通过纳米压痕网格分析对异质材料进行机械表征的稳健方法

摘要 本研究介绍了对 CuZn40Pb2 黄铜和 W-Cu（具有不同微观结构和机械性能的异质材料）进行纳米压痕网格获得的等高线图的分析。目的是提高相机械性能在统计分析方面的检测能力，同时提出一种用于纳米压痕数据逆向分析的公式，以实现完整的弹塑性表征。等高线图的分析提供了可以直接读取相位平均值和体值的曲线。在复杂的微观结构中，这提供了主要的机械性能，有助于对结果的解释。通过这种提出的方​​法对相位分数的估计比用统计分析进行的估计要好。标准差的估计在大多数情况下相当于统计分析；然而，在偏态分布上差异很大。用于逆向分析的目标函数的制定能够管理大量压痕，与拉伸试验确定的参数相比，产生具有出色精度的弹塑性参数。