Dynamic Response of Dome‐Shaped Sealing Parts With Different Structures Under Explosion Load in Finite Flow Field

The resin sealing parts obtained by 3D printing have been widely used in underwater sealing due to the ease of adjustment of size. To ensure the successful separation of seals, the blasting line separation technology is used. Numerical simulation and validation experiments are needed to investigate the damage law of resin sealing parts separated underwater. In the separation process of sealing parts, it is necessary to consider the influence of shock wave and hydrodynamic phenomenon generated by initial explosion in finite flow field. In this process, the aspects that need to be focused are the propagation process and damage mechanism of the blast shock wave in the sealed parts, the damage form, and damage mechanism of the hydrodynamic phenomenon on the sealing parts. Numerical simulation of the damage process was carried out using the fluid coupling algorithm in Autodyn, and the damage effects of sealing parts were obtained. The damage effects of the sealing parts were recorded by experiments. The damage effects fit well, verifying the credibility of the simulation. The damage process of sealing parts with different structures (conventional structure and structure with blast isolation groove) was compared, and the influence of structure on damage effect was analyzed. Finally, after validation experiments and simulations, we obtained and verified the damage law of the resin specimen. Besides, we also obtained the effect of the structure of the blast isolation groove on the impact resistance of the specimen.