Fracture Mechanics for an Interfacial Crack Between Adhesively Bonded Dissimilar Materials

摘要

A plate composed of two dissimilar materials, bonded together along a straight line with a center crack was studied. This problem represents an idealization of an adhesive joint or a composite structure with an interfacial flaw or crack caused by faulty joining techniques. Common examples are imperfections, voids, or broken bonds on the composite interface. Combined with the finite element technique, the strain energy method and the J-intergral method have been extended to a bi-material problem to calculate the value of the strain energy rate. The numerical analysis concentrated on three categories of composite materials with moduli ratio, E sub 2/E sub 1 = 1,20, and 120. These results provide a complete crack-tip stress analysis. Lastly, the compliance method was employed for experimental verification of the numerical results. (Author)