Stress field near crack close to bonding interface in explosion clad plate

Tensile tests are carried out using rectangular plate specimens extracted from the explosion clad plate. An artificial through-the-thickness edge crack or parallel cracks are made in each specimen. The cracks are close and perpendicular to the explosive interface. Stress field near cracks, stress intensity factor and crack opening displacement are examined by experiment as well as elasto-plastic finite element analysis. The stress field and stress intensity factor are evaluated by an infrared stress imaging system. The effects of the material inhomogeneity, residual stress, the change of material characteristics and the interaction of parallel cracks on the stress field, the stress intensity factor and the deformation behavior are revealed. The lower strength material ahead of the bonded interface increases the stress intensity factor and the crack opening displacement. The higher strength material ahead of the bonded interface decreases the stress intensity factor and the crack opening displacement.