关键词: strain energy release rate, non-principal directions of elasticity, central through crack, skew-symmetric loading, orthotropic composites

Abstract: In this paper, the fracture problem in non-principal directions of elasticity for a simple layer plate of linear-elastic orthotropic composite materials is studied.The formulae of transformation between characteristic roots, coefficients of elastic compliances in non-principal directions of elasticity and corresponding parameters in principal directions of elasticity are derived.Then, the computing formulae of strain energy release rate under skew-symmetric loading in terms of engineering parameters for principal directions of elasticity are obtained by substituting crack-tip stresses and displacements into the basic formula of the strain energy release rate.

Key words: strain energy release rate, non-principal directions of elasticity, central through crack, skew-symmetric loading, orthotropic composites