Dynamics analysis of al plate subjected to underwater impulsive loads based on 3D DIC

A three-dimensional dynamic digital image correlation (DIC) test system is set up based on the digital image correlation (DIC) method. The dynamic response experiment of AL1060 plate with speckles is conducted using the underwater impact loading device, and the out-of-plane displacement of Al target is obtained. The pressure-time histories of shock wave are measured by dynamic high-pressure transducers mounted on an anvil. A two-dimensional axisymmetric simulation model is established, and the formation and propagation of shock wave in water and the deformation process of Al plate are analyzed. The investigation shows that the deformation growth of the target presents an annulus expanding from the boundary to the center, and a shear cracking phenomenon easily appears at the constraint boundary. The calculated real-time deformation of target and the shock wave-pressure history are well in agreement with the experimental data, which confirms that it is feasible to study the underwater shock of plate structure using the underwater impact loading device in combination with 3D DIC.