Recent studies on the saturated impulse for ship structures under pressure pulse loading

Abstract

The impulse saturation of ship structures subjected to pressure pulse in blast and slamming has been taken into account recently in terms of the development of mechanical principles and phenomena. This article reviews the recent studies of the saturated impulse for ship structures under pressure pulse loading, including the modal approximation technique, the effect of transient response phase, membrane factor method, and so on. A newly proposed tool by combined membrane factor method (MFM) and saturation analysis (SA), which considers the transient response phase and exact yield condition, can provide more accurate predictions. In addition, based on the Youngdahl Equivalent Method (Y-EM) and Saturated Equivalent Method (S-EM) proposed earlier, a more effective and wide applicable method, named Progressive Equivalent Method (P-EM), is proposed. These studies have demonstrated that for long-duration pulse loaded structures, saturation analysis and pulse-equivalent method would be a superior option in structural design for performance improvement.