Factors influencing the resistance of bolt-connected structures to explosion shock based on explosion simulation

In this paper, the explosion impact resistance of bolt-connected structures is explored, and ALE explosion simulation algorithm is used to simulate and analyze bolt-connected platforms under explosion environment, and the accuracy of the finite element model is verified by comparison with the platform explosion test. Different modeling methods were used to explore the influence of different bolt models on the simulation results. It was found that the solid bolt model had the best effect and the error was the smallest, 1.5%, compared with the experiment. The other parameters of the bolt were kept unchanged, and only the bolt strength grade was changed. The influence of different bolt strength levels on the simulation results was explored. It was found that the maximum displacement of the target plate continued to decrease with the increasing of bolt strength level, and the anti-knock performance continued to improve. The effects of different bolt models and bolt strength grades on the explosion impact resistance of bolt-connected structures are summarized and analyzed, and some theoretical basis and reference are provided for bolt-connected body design of protected vehicles.