Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.11851/7032
Title: Mechanical modeling of thin films and cover plates bonded to graded substrates
Authors: Güler, Mehmet Ali
Keywords: thin film
contact stress
functionally graded material
cover plate
stress intensity factor
Issue Date: 2008
Publisher: Asme
Abstract: In this study, the contact problems of thin films and cover plates are considered. In these problems, the loading consists of any one or combination of stresses caused by uniform temperature changes and temperature excursions, far field mechanical loading, and residual stresses resulting from film processing or welding. The primary interest in this study is in examining stress concentrations or singularities near the film ends for the purpose of addressing the question of crack initiation and propagation in the substrate or along the interface. The underlying contact mechanics problem is formulated by assuming that the film is a "membrane" and the substrate a graded elastic continuum, and is solved analytically by reducing it to an integral equation. The calculated results are the interfacial shear stress between the film and the graded substrate, the Mode II stress intensity factor at the end of the film, and the axial normal stress in the film. The results indicate that grading the material properties of the substrate helps to decrease the film stresses and the stress intensity factors at the free edges and to lower the axial normal stresses at the midsection where the film is most likely to crack.
URI: https://doi.org/10.1115/1.2936237
https://hdl.handle.net/20.500.11851/7032
ISSN: 0021-8936
1528-9036
Appears in Collections:Makine Mühendisliği Bölümü / Department of Mechanical Engineering
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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