Wrinkling behavior of variable thickness films bonded to elastic substrates

材料科学 屈曲 复合材料 润湿 基质(水族馆) 波长 曲面(拓扑) 不稳定性 旋转(数学) 形态学(生物学) 机械 几何学 数学 光电子学 生物 海洋学 物理 地质学 遗传学
作者
Hui Zheng,Peijian Chen,Hao Liu,Yingying Zhang,Juan Peng
出处
期刊:Mechanics of Advanced Materials and Structures [Taylor & Francis]
卷期号:29 (28): 7316-7328 被引量:1
标识
DOI:10.1080/15376494.2021.1995797
摘要

The wrinkling morphologies in film–substrate systems are formed spontaneously, which provides a promising way to introduce novel functions on material surfaces. However, wrinkling behavior of variable thickness films bonded to elastic substrates is still unclear, which restricts the blooming applications of tunable wetting, tunable optical and antifouling surfaces. In the present paper, critical strain and wrinkling morphology affected by various parameters for two typical cases of variable film–substrate systems, that is, films with thickness gradient and films with periodic surface morphologies, are studied first. Theoretical analysis is then conducted to uncover the mechanism of different wrinkling patterns. And the wrinkling behavior of some extended designs based on the two typical cases is finally explored. It is found that the critical loading and wrinkling morphologies for the two typical cases are quite different. Three buckling modes are found, that is, sinusoidal buckling, Euler buckling and rigid rotation for periodic surface topologies of different scale compared with the wrinkling wavelength, which agrees well with theoretical prediction. Wrinkling morphologies can be well tuned by adjusting the thickness difference, the lengths of thick and thin regions, as well as surface morphologies of local regions of the upper film. The findings should be useful for the design of film–substrate systems in engineering practices, and improve the knowledge of elastic instability.
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