| Ceramic materials are an attractive choice in many applications in the automotive and aerospace industries. However, due to the high cost of manufacturing and fabrication of ceramics, metallic materials are an integral part of most typical ceramics based engineering applications. In order to take advantage of the strength of both materials, the bonding between these components should guarantee the combined performance.; Composite structures comprised of layers of different materials may be subjected to stresses due to external loads and thermal misfit of these materials. These stresses may cause cracking and delamination of the layers, or debonding of the coatings. Cracks may initiate at the interface and propagate towards the inner layers. In these types of problems interface toughness is an important parameter in helping engineers determine the stability of the interface crack. In order to ascertain the interface toughness, the strain energy release rates at the tips of the interface crack needs to be evaluated.; The present study is intended to find the stress intensity factors (SIF) and strain energy release rates (SERR) at the tips of an interface crack in a nonhomogeneous medium. In the considered boundary-value problem, a three-phase concentric cylinder model was used to analyze annular interfacial crack problems with Love's strain functions. The complex form of the second kind of singular integral equation was formulated using Bessel's functions in Fourier domain. The (SIF) and (SERR) were calculated by use of Jacobi polynomials.; An axisymmetric finite element model was generated and SERR was obtained by modified crack closure technique to verify analytical results. |
