Eigenfunction Expansion and Higher Order Weight Functions of Interface Cracks

In this paper the properties of the eigenfunction expansion form in the interface crack problem of plane elasticity are discussed in detail. After using the Betti’s reciprocal theorem to the cracked dissimilar bonded body, several path-independent integrals are obtained. All the coefficients in the eigenfunction expansion form, including the K₁ and K₂ values, and the J-integral can be related to corresponding path independent integrals. Possibility for formulating the weight function is also suggested.