In this work, finite element modeling (FEM) and experimental test were combined to study the scratch damage behaviors of poly(methyl methacrylate) (PMMA) side of alternating multi-layered PMMA/polyvinylidene fluoride (PVDF) materials. Firstly, FEM was conducted to uncover the effect of layer thickness on critical normal load of material removal (F_cr) of the PMMA side, and the optimal thickness was determined. Then scratch tests were performed on PMMA side of the multi-layered materials, the layer thickness of which was controlled by changing layer numbers. It was found that 8-layer material possessed the highest F_cr on PMMA side (even 25% higher than pure PMMA), which was consistent with the FEM results. A more uniform deformation occurring at the surface layer was ascribed to decreasing the von Mises stress and ultimately preventing localized large deformation of PMMA, which therefore opened a new strategy to improve the scratch resistance of rigid polymers by introducing soft components.

在这项工作中，有限元建模（FEM）和实验测试相结合，以研究交替使用的多层PMMA /聚偏二氟乙烯（PVDF）材料的聚甲基丙烯酸甲酯（PMMA）侧的划痕损伤行为。首先，进行有限元分析以揭示层厚度对PMMA侧材料去除的临界法向载荷（F _cr）的影响，并确定最佳厚度。然后在多层材料的PMMA侧进行刮擦测试，该多层材料的层厚度通过更改层数来控制。发现8层材料具有最高的F _cr在PMMA方面（甚至比纯PMMA高25％），这与FEM结果一致。在表面层发生的更均匀的变形归因于降低了冯·米塞斯应力，并最终防止了PMMA的局部大变形，因此开辟了一种通过引入软组分来提高刚性聚合物的耐刮擦性的新策略。