The Effect of Fatigue on Crack Propagation in Flat Plates under Buckling Bending and Shear

Many works have been carried out to determine expressions for critical loads of crack propagation in flat plates under elementary load cases of shear, compression, bending and combination of theme. In this new solution, the analytical work must take into consideration the effect of fluctuating the buckling load for panels under various types of bending and shear loading. The effect of combined buckling shear and bending stresses on the crack propagation has been considered in this research. The analytical solution is based on a combination of maximum strain under mixed mode, Paris and Sih equation with Forman et al. equation. Different boundary conditions must be included in the flat plates, and new stress intensity factors for combined modes I and II have been developed for the crack growth. Also the results show the effect of crack length on the stress distribution and the direction of crack propagation.