Ordered ring-shaped cracks induced by indentation in metal films on soft elastic substrates.,Physical Review E

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Ordered ring-shaped cracks induced by indentation in metal films on soft elastic substrates.
Physical Review E ( IF 2.2 ) Pub Date : 2020-08-03 , DOI: 10.1103/physreve.102.022801
Senjiang Yu ₁ , Long Ma ₂ , Linghui He ₂ , Lingwei Li ₁ , Yong Ni ₂

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Ordered crack patterns contain plentiful physical mechanisms and are useful for technological applications such as lithography, template, and biomimicry. Here we report on ordered multiple ring-shaped cracks induced by indentation in metal films on soft elastic polydimethylsiloxane (PDMS) substrates. It is shown that the indentation triggers the deformation of PDMS substrate and generates a radial tensile stress in the film, leading to the formation of ring-shaped cracks with a nearly uniform spacing. The morphological characteristics and evolution behaviors of the multiple ring-shaped cracks are revealed by optical microscopy, atomic force microscopy, and scanning electron microscopy. Their formation mechanisms are discussed by theoretical analysis based on the fracture mechanics. The report in this work can promote better understanding of the indentation-induced stress anisotropy and mode competition in rigid-film–soft-substrate systems and provide a facile strategy to control the crack patterns by simple mechanical loading.

中文翻译：

在软弹性基材上的金属膜中的压痕引起的有序环状裂纹。

有序的裂纹模式包含丰富的物理机制，可用于光刻，模板和仿生技术等技术应用。在这里，我们报告了由在软弹性聚二甲基硅氧烷（PDMS）基底上的金属膜中的压痕引起的有序的多个环形裂纹。结果表明，该压痕触发了PDMS基板的变形，并在薄膜中产生了径向拉伸应力，导致形成了几乎均匀间距的环形裂纹。通过光学显微镜，原子力显微镜和扫描电子显微镜揭示了多个环形裂纹的形态特征和演化行为。通过基于断裂力学的理论分析讨论了它们的形成机理。

更新日期：2020-08-03

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