A study of the effect of impact loading on DSIFs and crack propagation in plate

Abstract

In this work, a study of the effect of impact loading on dynamic crack propagation in thin and isotropic thick plates for two types of material, stainless steel, and aluminum, are investigated analytically and numerically to give a complete study of 3D crack growth of simply supported plate with internal crack at the center of plate. The dynamic stress intensity factor (DSIFs), the velocity of dynamic crack propagation, and the deep of the crack normal to the crack face for different angles from the crack tip have been calculated when the Contact of a cylindrical impactor on isotopic plates is considered, to support the analytical result for DSIFs with a numerical package result (Ansys-10). This is based on the finite element method used to investigate the stress and the values of dynamic stress intensity factors at the crack tip by full transient dynamic Analysis using 3D (element, Solid-90). The results from the Airy stress function method give good agreement with the results of Ansys for a long time duration in impact loading while the energy method is in agreement with the Ansys package for some time and then becomes limited. In addition, the DSIFs and crack propagation velocity are increasing with an angle from the crack tip and velocity impact increasing.