Numerical simulation of cylindrical shell loaded by explosive rods (I): Fluid-structure interaction simulation

A loading test by explosive rods to simulate mechanical effects of pulsed X-ray was numerically simulated by fluid-structure interaction method. The 2-D numerical model including a cylindrical shell, two layers of rubbers, nineteen explosive rods and a layer of air was built. Therein, the two rubber materials were described by Ogden hyperelastic models, the explosive rods and their explosion product were described by High Explosive Burn model and JWL equation of state, and the air was described by polynomial equation of state. The numerical simulation was performed by the multi-material ALE method. The physical images, load transmission and structural responses were obtained. The results show that, in the loading test of Ø265 mm cylindrical shell by 19 explosive rods to simulate a cosine-distributed load induced by X-ray, the stress responses at typical locations are basically equivalent. Furthermore, the additive two rubber layers can affect the response characteristics of the shells, and tightly glued interactions can distort the structural responses of shells with small mass and/or low stiffness.