Dynamic response of fully clamped sandwich pipes under transverse localized impulse

Abstract

The development of sandwich pipes is propelled by the demands of both submarine pipelines and lightweight energy absorbers. Because of the complexity of impulse related to the traveling of plastic hinges, the plastic behaviors of sandwich pipes under transverse localized impulse are still not well understood despite the structures are susceptible to underwater explosions caused by explosives and torpedoes. In the present paper, a theoretical model is proposed by dividing the entire response into three successive phases according to the traveling of the plastic hinges. Based on the yield loci for the cross-section of a sandwich pipe proposed in our previous work, the deflection histories and the maximum deflection of the sandwich pipe are predicted theoretically and compared with the numerical results. Well agreements are achieved between the theoretical predictions and the numerical results. It is demonstrated that the loading areas have remarkable effects on the dynamic response of the structure. The present work provides a basic understanding of the plastic behaviors of sandwich pipes threatened by transverse impulse.