Controlled wrinkling analysis of thin films on gradient substrates

doi:10.1007/s10483-017-2199-9

Abstract

Abstract:

The paper investigates continuously changing wrinkle patterns of thin films bonded to a gradient substrate. Three types of gradient substrates including exponential, power-law, and symmetry models are considered. The Galerkin method is used to discretize the governing equation of film bonded to gradient substrates. The wavelength and the normalized amplitude of the wrinkles for substrates of various material gradients are obtained. The numerical simulation based on the finite element method (FEM) is used to evolve the wrinkle patterns. The result agrees well with that of the analytical model. It is concluded that localization of wrinkle patterns strongly depends on the material gradient. The critical membrane force depends on both the minimum value of wrinkle stiffness and the gradient of wrinkle stiffness when the wrinkle stiffness is at its minimum. This work provides a better understanding for local wrinkle formation caused by gradient substrates.

Key words: coupled oscillators system, attractor, cone, horizontat curve, material gradient, thin film, wrinkle, Galerkin method, gradient substrate

2010 MSC Number:

O343.9

Jianzhong ZHAO, Xingming GUO, Lu LU. Controlled wrinkling analysis of thin films on gradient substrates. Applied Mathematics and Mechanics (English Edition), 2017, 38(5): 617-624.

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