The Dynamic Mechanical Behavior Of Double-layer Steel Tube Under Internal Blast-load

Steel tube not only has light weight, simple configuration, but also shows great mechanical properties under pressure, tension, torsion and bending force. And steel tube is more and more widely used. This kind structure can be divided into single steel tube, double-layer steel tube, sandwich steel tube. This article mainly investigates the dynamic response of double-layer steel tube and sandwich steel tube under internal blast-load.This article experimentally and numerically investigates the dynamic response of double-layer steel tube under internal blast-load. Experimental results show that the change of wall-thickness affects deformation pattern of double-layer steel tube, and with increasing of inner-tube or outer-tube’s wall-thickness, deformation region and deflection on outer-tube decrease. Coupling algorithm is used in numerical simulation. Mainly discuss how wall-thickness arrangement, charge mass and tube gap affect the structure’s deformation behavior and energy absorption. The results indicate that inner pipe thickness change does more significant effect on the shock resistance performance and energy absorption of double-layer steel pipes under the studied charge mass, but the effect reduces with the increasing of charge mass. Meanwhile, deflection on the outer pipe reduces with the increase of tube gap.For sandwich steel tube, this article also presents results of numerical research with ConWep algorithm on dynamic response and deformation pattern of sandwich steel tube under internal blast-load. Consider how density of core layer and tube material affect the structure’s deformation behavior and energy absorption. Contact force among tube-parts changes as the core’s relative density changes. With the increase of core’s relative density, deflection on inner pipe gradually reduces, the outer tube get its small deflection on a low core’s relative density. Sandwich steel pipe performs better than sandwich aluminum tube when subjected to internal blast-load. In addition, double-layer steel tube performs better than sandwich steel tube under small charge mass. While with the charge mass increase, sandwich steel tube performs better than some double-layer steel tube. Compared with coupling algorithm, the results using ConWep algorithm can get similar but smaller results.