Numerical Simulation of Contact Explosion on Reinforced Concrete Slabs Based on Different Algorithms

The explosion dynamics process is complex and difficult to carry out accurate analytical analysis. Numerical simulation with controllable boundary conditions and initial conditions can continuously and repeatedly display the explosion development process over time. In this paper, we take a single-layer reinforced concrete slab contact explosion as an example and use Lagrange method, Arbitrary Lagrangian-Eulerian (ALE) method, and smoothed particle hydrodynamics (SPH) method in LS-DYNA software to simulate the explosion of explosives. The results show that Lagrange method can display a clear material interface, but the explosives elements in the simulation of explosion process could cause serious distortion easily leading to the termination of the calculation; the explosives and air in the ALE method are Eulerian materials, there is no element distortion, but the number of the explosives and air elements that need to be established is relatively large; SPH algorithm can simulate the large deformations caused by explosion, making it more realistic in simulating the splashing of explosive materials. In the comparison of three algorithms, the ALE algorithm matches the experimental results the best.