Fluid Structure Interaction During Shock Loading in a Compressible Fluid

Abstract

The compressibility of a fluid highly affects the fluid structure interaction during a shock loading. The currently available fluid structure interaction models all ignore the compressibility of a fluid; this is only valid for an underwater shock loading or a very weak air shock loading. In this paper, a new 1-D fluid structure interaction model based on the gas-dynamic theory (Rankine-Hugoniot relation) is proposed. This model considers the fluid compressibility and therefore is more accurate for a shock loading process in a compressible fluid, such as air. A series of well-designed 1-D shock wave loading experiments on free-standing monolithic metal plates using a shock tube apparatus are performed to verify the proposed model. The reflected pressure profile and the impulse imparted upon the specimens are all predicted. The results show that the current model can give a more accurate prediction on the reflected pressure profile and the imparted impulse on the specimen than that from the classic Taylor’s model, which does not consider fluid compressibility.KeywordsBlast resistanceBlast loadingFluid structure interaction