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

M. Gharbi, Sami El-Borgi, M. Chafra

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The elastodynamic problem of a surface crack in a graded coating bonded to a homogeneous substrate under dynamic loading 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 dynamic loadings which give rise to mixed fracture modes which turn out to be uncoupled due to the fact that the crack axis is parallel to the material gradient. Using integral transforms, the resulting mixed-boundary value problem is reduced to a set of two uncoupled singular integral equations which are solved numerically to obtain the crack-tip stress intensity factors. The main objective of the paper is to study the effect of the coating thickness and nonhomogeneity parameter on the crack tip dynamic stress intensity factors for the purpose of gaining better understanding on the behavior of graded coatings.

Original languageEnglish
Pages (from-to)677-693
Number of pages17
JournalInternational Journal of Engineering Science
Volume49
Issue number7
DOIs
Publication statusPublished - Jul 2011
Externally publishedYes

Fingerprint

Cracks
Coatings
Substrates
Stress intensity factors
Crack tips
Boundary value problems
Integral equations

Keywords

  • Dynamic loading
  • Graded coating
  • Mixed-mode loading
  • Singular integral equations
  • Stress intensity factor
  • Surface crack

ASJC Scopus subject areas

  • Engineering(all)

Cite this

A surface crack in a graded coating bonded to a homogeneous substrate under dynamic loading conditions. / Gharbi, M.; El-Borgi, Sami; Chafra, M.

In: International Journal of Engineering Science, Vol. 49, No. 7, 07.2011, p. 677-693.

Research output: Contribution to journalArticle

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