Dynamic Analysis of Double-Skin Composites

Document Type : Original Article

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Egyptian Armed Forces.

Abstract

Abstract Double skin composite (DSC) is the term used to describe a structural system of steel plates connected to a sandwiched concrete core with welded stud shear connectors. In the present paper a non-linear three-dimensional finite element models for Double Skin Composite (DSC) panels subjected to dynamic loading, using a general purpose finite element package ABAQUS version 6.4, is introduced. Pilot model was used to investigate the failure pattern in the composite panel when subjected to Impact loads by rigid penetrator, while the other models were used to analyze the energy absorption capacity of such system when perforated. These models include variation of upper and lower plate thicknesses as well as increasing number of shear connectors in upper or lower plates. Moreover, the last model includes concentrating the distribution density of stud shear connectors in the middle of the upper plate. These models were checked first against quasi static, experimental and finite element results. Results showed that such elements have great ability of absorbing energy when subjected to perforation due to ductility of lower plate skin and vertical stiffness of lower shear studs. Effect of increasing lower plate thickness as well as number of shear connectors, to face impact loading has a great role in controlling the amount of energy absorbed by such structures due to its ability to prevent concrete scabbing from impact rear face which relaxes strain rate of concrete while resisting penetration due to the presence of lower shear studs

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