Maculotti Giacomo, Giorio Lorenzo, Genta Gianfranco, Galetto Maurizio
Department of Management and Production Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Turin, Italy.
Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Turin, Italy.
Materials (Basel). 2025 Sep 19;18(18):4382. doi: 10.3390/ma18184382.
Area shape function and frame compliance are the most critical parameters in nanoindentation, as they control measurement accuracy and represent the largest contributions to measurement uncertainty. Despite the availability of direct calibration methods, indirect calibrations are the most practical and fast. Thus, the indirect calibration methods proposed in ISO 14577-2 are most typically applied in academic and industrial research, as well as in quality controls. Previous research has highlighted some criticalities, but a holistic metrological framework was missing. This work aims to compare the performances of indirect calibration methods for area shape function and frame compliance in the nano-range, considering different alternatives suggested in the standard and most recent literature. The comparison will be based on uncertainty estimation using bootstrap estimation, which will innovatively highlight and introduce the effect of the nanoindentation dataset in the uncertainty estimation. The results show that the optimization of accuracy and uncertainty in mechanical characterization is achieved by indenting pairs of certified reference materials, resulting in a more robust approach to calibration experimental conditions than methods that require a single sample to be indented.
面积形状函数和框架柔度是纳米压痕中最关键的参数，因为它们控制着测量精度，并且是测量不确定度的最大贡献因素。尽管存在直接校准方法，但间接校准最为实用和快速。因此，ISO 14577-2中提出的间接校准方法最常用于学术和工业研究以及质量控制中。先前的研究已经突出了一些关键问题，但缺少一个整体的计量框架。这项工作旨在比较纳米范围内面积形状函数和框架柔度的间接校准方法的性能，考虑标准和最新文献中提出的不同替代方法。该比较将基于使用自助估计的不确定度估计，这将创新性地突出并引入纳米压痕数据集在不确定度估计中的影响。结果表明，通过对成对的经认证参考材料进行压痕，可以实现机械表征中精度和不确定度的优化，与需要对单个样品进行压痕的方法相比，这是一种更稳健的校准实验条件的方法。
