Multilayer materials have found extensive application within the aerospace industry due to their notable mechanical attributes. The operational longevity and dependability of such materials are substantially influenced by the performance characteristics of individual layers. In this study, an indentation method was established for employing a weighting function to simultaneously characterize the elastic modulus, hardness and film thickness of tri-layer materials. The results of numerical simulations indicate that incorporating the substrate effect in such an approach allows for precise assessment of the mechanical properties of tri-layer materials with diverse thicknesses. To validate the method, nanoindentation tests were performed using two tri-layer materials (i.e., Al/Cu/304SS and Cu/Al/304SS). Further, according to numerical and experimental data, the proposed model could be reduced to evaluate the mechanical properties of a bilayer material. The present findings demonstrate the effectiveness and applicability of the proposed indentation method in characterizing multilayer materials, facilitating reliable assessment in practical applications.

多层材料由于其显着的机械属性而在航空航天工业中得到了广泛的应用。此类材料的使用寿命和可靠性很大程度上受到各层性能特征的影响。本研究建立了一种利用加权函数同时表征三层材料的弹性模量、硬度和膜厚度的压痕方法。数值模拟的结果表明，将基底效应纳入这种方法可以精确评估不同厚度的三层材料的机械性能。为了验证该方法，使用两种三层材料（即 Al/Cu/304SS 和 Cu/Al/304SS）进行了纳米压痕测试。此外，根据数值和实验数据，可以简化所提出​​的模型来评估双层材料的机械性能。目前的研究结果证明了所提出的压痕方法在表征多层材料方面的有效性和适用性，有助于在实际应用中进行可靠的评估。