Mechanical modeling of Thin Films Bonded to Functionally Graded Materials

Date

2008-09-25

Author

GÜLER, MEHMET ALİ
Gulver, Yusuf Fuat
Dağ, Serkan

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

219
views

0
downloads

In this study the contact problems of thin films bonded to Functionally Graded Materials (FGM) 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 in the manufacturing process of the graded coating. 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 FGM an 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, mode II stress intensity factor at the end of the film and the axial normal stress in the film.

Subject Keywords

Contact mechanics, Thin films, Friction, Functionally graded materials

URI

https://hdl.handle.net/11511/38774

DOI

https://doi.org/10.4028/www.scientific.net/msf.631-632.333

Collections

Department of Mechanical Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Modeling of thin films and cover plates bonded to graded substrates GÜLER, MEHMET ALİ; Erdogan, Fazil; Dağ, Serkan (2006-10-18) In this study the contact problems for thin films and cover plates will be 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...
Contact mechanics of graded orthotropic coatings Arslan, Onur; Aksel, Mehmet Haluk; Dağ, Serkan; Department of Mechanical Engineering (2015) Analytic and computational studies are performed for contact problems of orthotropic functionally graded material (FGM) coatings which are bonded to isotropic homogeneous substrates without any interfacial defects. The orthotropic FGM coatings possess orhotrophic stiffness gradations through the coating thickness direction. The variations of each orthotropic stiffness constants are assumed to behave as exponential functions. In the analytical procedure, the problems of orthotropic graded coatings which are ...
Mixed-mode fracture analysis of orthotropic FGM coatings under mechanical and thermal loads İlhan, Küçük Ayşe; Dağ, Serkan; Department of Mechanical Engineering (2007) In this study, it is aimed to investigate the mixed-mode fracture behavior of orthotropic functionally graded material (FGM) coatings bonded to a homogeneous substrate through a homogeneous bond-coat. Analytical and computational methods are used to solve the embedded cracking problems under mechanical or thermal loading conditions. It is assumed that the material property gradation of the FGM coating is in the thickness direction and cracks are parallel to the boundaries. The principal axes of orthotropy a...
Crack problem for a functionally graded layer on an elastic foundation Kadıoğlu, Fevzi Suat; Yahşi, Selçuk (1998-01-01) In this paper internal and edge crack problems for an FGM layer attached to an elastic foundation are considered. This model can be used to simulate circumferential crack problem for a thin walled cylinder. It is assumed that the mechanical properties of the layer are varying in thickness direction. Crack is assumed to be perpendicular to the surfaces. For this geometry stress intensity factors are calculated for a number of different crack surface tractions. By using the calculated stress intensity factors...
Contact mechanics of graded materials: Analyses using singular integral equations Dağ, Serkan (2006-10-18) Contact stress distribution at an FGM surface is evaluated using an analytical technique based on the singular integral equations. An FGM half-plane is assumed to be in sliding contact with a rigid stamp of an arbitrary profile. The functionally graded medium is assumed to possess two-dimensional material property variations. Two independent nonhomogeneity constants are used to derive the governing partial differential equations. By using the integral transform techniques, all boundary conditions are satisf...

Citation Formats

M. A. GÜLER, Y. F. Gulver, and S. Dağ, “Mechanical modeling of Thin Films Bonded to Functionally Graded Materials,” 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38774.