Experimental and Numerical Investigation into the Effect of Core Density on the Energy Absorption of Sandwich Panels with Aluminum Face Sheets and Polyurethane Foam Core

Document Type : Research Article

Authors

1 Department of Mechanical Engineering faculty of Engineering Imam Hossein Comprehensive University

2 Mechanical Engineering Department, Faculty of Engineering, Imam Hossein Comprehensive University, Tehran, Iran

3 PhD student Guilan University

Abstract

Sandwich panels with metallic face-sheets and foam core are of great importance in aerospace, naval and automotive industries due to high strength to weight ratio and high energy absorption characteristics. In this article, several aluminum sandwich panels with polyurethane foam core with different densities were designed and tested using a shock tube facility. Some of blast tests were defined in order to determine the effects of foam density on the back face-sheet displacement and energy absorption of sandwich structures. Also using the results of compression test performed on different foams, numerical simulation using Autodyn software was performed. There was a good agreement between experimental investigation and numerical results. The results show that increasing foam density can lead to reducing the back face-sheet displacement of the sandwich panel, but the energy absorption of the panel also decreases. Moreover, increasing the density of the foam, in addition to reducing the shape of the back face of the panel, leads to more uniform profile. So, if the sandwich panel is the main structure, it is advisable to use high-density foam, but if the panel is to be installed as an absorber structure on another structure, lower density foam should be used to reduce the pressure transferred to the back face of the panel. Also, the results show that the changes of the back face[1]sheet displacement versus impulse are linear and increasing impulse can lead to increasing the energy absorption of the core and decreasing the energy absorption of the face-sheets.

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Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 52, Issue 10
January 2021
Pages 2839-2858

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