预置裂纹靶板在水下冲击波作用下的动态响应研究

The ship structure is inevitable to be scratched, grooved or damaged in the processes of manufacturing and use, which may reduce the damage-resistant capability of ship structure to some extend. An equivalent underwater explosion impact loading device was used for the impact experiments on the pre-cracked target plate, and the deformation of target plate was recorded by using high-speed camera. The dynamic response mechanism of the pre-cracked plate under underwater impact load was studied through experiment and ABAQUS simulations, and the "three-stage" dynamic response result was acquired. The results show that the dynamic responses of target plates which have pre-cracks with different shapes are different in the final failure stage. The target plates tend to release all the energy with fewest cracks. The crack parameters are studied. The displacement of pre-cracked target plate has approximately linear relationship with the loading impulse. With the increase in the crack depth or length, the residual impact resistance of target plate decreases.