Study on the Wall Pressure Generated by Detonation Products on the Inner Panel of a Double-layer Structure with a Hole

To investigate the characteristics of wall pressure generated by detonation products on the inner panel of a double-layer structure with a hole, we conducted theoretical and experimental studies were conducted. The evolution process of the underwater contact explosion bubble and detonation product jet was divided into three stages: 1) bubble expanding and detonation products entering through the hole, 2) detonation product jet moving in the structure, and 3) detonation product jet impacting the inner panel. Dynamic equations of the detonation products passing through the hole were constructed, the attenuation laws of the velocity and density of detonation products moving in the structure were derived, and a theoretical calculation model for wall pressure on the inner panel of the double-layer structure was established. The effects of charge weight, break radius, and cabin width on bubble motion and wall pressure were analyzed. Additionally, an underwater contact explosion test on a double-layer structure was conducted. The evolution process of the explosion bubble and detonation product jet was photographed using a high-speed camera and the time history of wall pressure on the inner panel was recorded. The results indicate that the deviation in the peak pressure and impulse between the theoretical calculation results and test measurement results were -5.84% and 9.71%, respectively. The accuracy of the theoretical calculation model can meet the requirements of engineering applications, thereby providing a theoretical basis for the damage assessment and shock-resistant design of ship structures.