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Dynamic analysis of an elasto‐plastic sandwich subjected to low velocity impact

Mondher Wali (Research Unit of Dynamics of Mechanical Systems, National School of Engineers of Sfax, Sfax, Tunisia)
Moez Abdennadher (Research Unit of Dynamics of Mechanical Systems, National School of Engineers of Sfax, Sfax, Tunisia)
Tahar Fakhfakh (Research Unit of Dynamics of Mechanical Systems, National School of Engineers of Sfax, Sfax, Tunisia)
Mohamed Haddar (Research Unit of Dynamics of Mechanical Systems, National School of Engineers of Sfax, Sfax, Tunisia)

Multidiscipline Modeling in Materials and Structures

ISSN: 1573-6105

Article publication date: 9 August 2011

Abstract

Purpose

The purpose of this paper is to analyse the dynamic behaviour of an elasto‐plastic sandwich subjected to low velocity impact.

Design/methodology/approach

A numerical model is developed with the assumption that the plastic deformation is confined under the contact area. The structure is analyzed using the in‐house finite element code with an appropriate contact law. During the impact progression, two phases (elastic and plastic) related to the impact intensity are considered in the dynamic model. The proportional viscous damping is incorporated in the model. An elasto‐plastic impact algorithm is established to determine the impact force, the sandwich structure displacement and indentation.

Findings

The numerical results are validated by experimental dropping weight impact tests. The influences of the impactor radius, the core material variation and the impactor initial velocity on the dynamic behaviour of the impacted structure are studied.

Originality/value

In order to study the low velocity impact problems by considering the caused plastic deformations, a simple numerical elasto‐plastic impact model of sandwich structure is proposed.

Keywords

Citation

Wali, M., Abdennadher, M., Fakhfakh, T. and Haddar, M. (2011), "Dynamic analysis of an elasto‐plastic sandwich subjected to low velocity impact", Multidiscipline Modeling in Materials and Structures, Vol. 7 No. 2, pp. 184-206. https://doi.org/10.1108/15736101111157118

Publisher

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Emerald Group Publishing Limited

Copyright © 2011, Emerald Group Publishing Limited