Dynamic response analysis of a small-scaled ACLNG storage tank under penetration and explosion loadings

The all-concrete liquefied natural gas (ACLNG) storage tank promises a great prospect for development. The process of the storage tank being impacted by the oval projectile is a transient, strong nonlinear and strong coupling complex dynamic problem. In this paper, a fluid-solid coupling numerical analysis model was established for the dynamic response and damage of a small-scaled domed ACLNG storage tank under penetration and explosion loadings. The effectiveness of the self-programmed Lagrange-Euler grid mapping algorithm and ghost-fluid Eulerian-Lagrangian algorithm (GEL) and the accuracy of the simulation results were verified by comparing with the experimental data of existing researches. Then the explosion shock wave propagation law under different explosives and different detonation points was explored. The relative relationship of pressures at different positions of the fluid field was compared and analyzed. In addition, the damage characteristics of the storage tank under different conditions were investigated. The results show that: (1) the shock wave will attenuate in a very short time after detonation, resulting in large differences between the pressure peaks at different positions; (2) the broken hole caused by penetration has an effect on pressure release when the same explosive detonates at the same position; (3) the connections between the sidewall and the top and bottom plates are susceptible to damage and failure due to the aggregation of shock waves and stress concentration and hence should be protected in priority.[Figure not available: see fulltext.]