Wrinkling of a Thin Film-Substrate with Non-Uniform Thickness

سال انتشار: 1396
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 267

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شناسه ملی سند علمی:

WMECH04_119

تاریخ نمایه سازی: 11 خرداد 1397

چکیده مقاله:

Wrinkling of thin films is an important issue in various fields such as skin aging, mechanics of scars,meteorology of the material properties of thin layers, coating of the surfaces, detaching and fracture of the boundedfilms, civil and military unmanned aerial vehicles and etc. Wrinkles lead to the failure or inappropriate operation ofthe system in gossamer space structures, optical mirrors, stretchable electronics and wound healing in surgery.Compressive stresses on the film may develop different patterns of wrinkles on the film‒substrate system. Thewrinkling of uniform film-substrate systems has been studied by many researchers with a sinusoidal pattern along thefilm span; while considering the effect of the non-uniformity of the geometry or material properties of the system hasnot yet well understood. In this work, a thin film is modeled like a strip on an elastic foundation and the wrinklingpattern and critical loads are determined numerically by using a finite difference method. The effect of the nonuniformthickness on the wrinkling pattern is sought for a film with finite length. Unlike the film with uniformthickness, for the film with non‒uniform thickness, the wrinkles accumulate around the location with lower bendingrigidity (i.e. thinner regions of the film). The results of the analysis bring more insights into the physics of wrinkling inscience and provide effective tools for development of the wrinkling applications in technology.

نویسندگان

M Noroozi

Assistant Professor, Faculty of Mechatronic, Karaj Islamic Azad University, Karaj, Alborz, Iran