Dynamic responses of corrugated cylindrical shells subjected to nonlinear low-velocity impact

Abstract

Owing to high capacity of energy absorption, high compressive strength, high stiffness to weight ratio, good ductility and other excellent characteristics, corrugated structures are widely used in aerospace, civil, petrochemical engineering and other industries. These structures are often subjected to low-velocity impact during operation, which has a destructive effect on the strength and stiffness of engineering structures. However, since the process of low-velocity impact is a strongly nonlinear time-varying process, it is difficult to obtain the impact force. The present study proposes a novel computational method for nonlinear impact force in the local contact area, and analyzes the dynamic response of corrugated structures. Firstly, a new equivalent shell model of corrugated cylindrical shells is established. Afterwards, the governing equations are obtained by using the Love thin shell theory and Hamilton principle, and then turned into ordinary differential equations by the Galerkin procedure, upon which numerical solutions are achieved by the Duhamel integration and small-time increment technique. Then, numerical examples are given to illustrate validity and efficiency of the proposed method. Finally, the influence of key parameters on impact response of different types of corrugated shells is analyzed. (c) 2022 Elsevier Masson SAS. All rights reserved.