A surface crack in a graded coating bonded to a homogeneous substrate under general loading conditions

Abstract

The elastostatic problem of a surface crack in a graded coating bonded to a homogeneous substrate under general loading conditions is considered. The coating is graded along the thickness direction and modeled as a nonhomogeneous medium with an isotropic stress-strain law. The problem is solved under the assumption of plane strain or generalized plane stress conditions. The crack surfaces are subjected to arbitrary loadings which give rise to mixed fracture modes which can be uncoupled due to the fact that the crack axis is parallel to the material gradient. Therefore, the opening and sliding mode problems may be formulated separately. For each problem, the solution of the composite medium may be determined by obtaining the solution of the homogeneous substrate and that of the graded layer. The latter solution may be expressed as the sum of two solutions, namely an infinite graded medium with a crack and a graded strip without a crack. The resulting mixed-boundary value problem is reduced to a set of two uncoupled singular integral equations which are solved numerically using Jacobi polynomials. The main objective of the paper is to study the effect of the layer thickness and nonhomogeneity parameter on the crack tip mixed-mode stress intensity factors for the purpose of gaining better understanding on the behavior of graded coatings.

Cracking of a functionally graded coating due to sliding contact with heat generation

“…A coupled type crack and contact problem for functionally graded halfplane involving a surface crack was solved by Dag and Erdogan. 25 El-Borgi et al 26 analyzed the surface crack problem in a graded coating/substrate system. The main purpose of that study was to investigate the influence of coating layer thickness and non-homogeneity parameter on the crack tip SIFs in a mixed-mode.…”

Oblique surface cracking and crack closure in an orthotropic medium under contact loading

“…El-Borgi et al [28] and Dag et al [29] work on surface crack problem in graded coatings bonded to a homogeneous substrate. El-Borgi et al [28] choose to examine this problem under general loading conditions. On the other hand, the solution is done with a two-stage method for the sliding contact case by Dag et al [29].…”