Materials

ABSTRACT In this investigation, J-integral for the cracked panel with stiffeners is studied considering the finite ele-ment models. In the first case, the panel with two stiffeners is examined where in position of the stiffeners is increased. The crack length is varied keeping the stiffener at one inch from the crack tip is presented as case two. Isotropic (steel and aluminum) and orthotropic materials (glass epoxy and graphite epoxy) are selected for the whole stiffened panel. The finite element models for different stiffener and crack configurations are generated using ANSYS11 and the non dimensional value of the J- integral is calculated and is plotted against position of the stiffener for case one and crack length for case two. The presence of stiffeners made significant contribution in the reduction of J-integral when compared with the sample without stiffeners