Interface Fracture and Delaminations in Composite Materials

1 Introduction.- References.- Part I Interface Fracture.- 2 Fundamentals of interface fracture mechanics.- 2.1 Stress and displacement field in the neighborhood of an interface crack tip.- 2.2 Interface energy release rate.- 2.3 Fracture criterion.- References.- 3 Calculation of stress intensity factors - an interface crack.- 3.1 Finite element method.- 3.2 Displacement extrapolation method.- 3.3 M-integral.- 3.4 Virtual crack closure technique.- References.- 4 Testing-interface crack between two isotropic materials.- References.- Part II Delaminations in Composites.- 5 Mathematical treatment of delaminations.- 5.1 The 0^o/90^o interface.- 5.2 The +45°/ - 45° interface.- 5.3 The +30°/ - 60° and -30°/ + 60° interfaces.- 5.4 An interface between two woven plies.- 5.5 Afterword.- References.- 6 Methods of calculating stress intensity factors- Delaminations.- 6.1 Displacement extrapolation.- 6.2 M-integral.- 6.3 Virtual crack closure technique.- References.- 7 Testing-delamination between two dissimilar plies.- 7.1 Failure of a delamination in a cross-ply.- 7.2 Beam type specimens.- References.- Appendix A. Stress and displacement functions for the flrst term of the asymptotic expan on of an interface crack between two linear elastic, homogeneous and isotropic materials.- Appendix B. Matricesfor different anisotropic material pairs.- B.1 The 0^o/90^o pair.- B.2 The +45°/ - 45° pair.- B.3 The +30°/ - 60° pair and the -30°/ + 60° pair.- B.4 Multi-directional woven material.- References.- Appendix C. Stress and displacement fiinctions for the first term of the asymptotic expansion of an interface crack between two amsotropic materials-the 0^o /90^o pair.- References.- Index.