Investigation of the failure mechanisms of photocurable resins under explosive shock loads

Resin components produced by photocuring technology and 3D printing are commonly utilized as seals across various media owing to their flexible molding, precise structure, and excellent watertightness. Under certain specific conditions, it is necessary to detach the photocurable resin seals from the main body using explosive cord blasting. However, the mechanical performance of photocurable resins under explosive shock loads remains underexplored. This study aimed to explore the mechanisms underlying the destruction of photocurable resins by explosive cords in different environments. We conducted explosive shock experiments on photocurable resin specimens both in air and underwater and employed explicit dynamics software to simulate the damage process of the resin material. The experiments showed that a 10 mm thick specimen in air reached a critical fracture state under the equivalent explosive shock of the explosive cord, leading to adjustments in the constitutive parameters of the photocurable resin model in the simulations. In addition, the JH-2 strength and failure model was applied in AUTODYN explicit dynamics software to characterize the mechanical properties of the resin materials. The fluid–structure interaction method was utilized for modeling and simulating the shock process on photocurable specimens in air and water, clarifying the role of groove shape in the fracture state of the specimens and the failure mechanisms of the photocurable resin materials under explosive shock.