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Investigating the crumpling effect in honeycomb sandwich panels under bending loads using FEA technique

Published online by Cambridge University Press:  12 September 2023

N. Saqib Open the ORCID record for N. Saqib [Opens in a new window] ,
T. Jamil Open the ORCID record for T. Jamil [Opens in a new window]  and
B.A. Zai
N. Saqib
Affiliation:
Department of Mechanical Engineering, NED University of Engineering and Technology, Karachi, Pakistan
T. Jamil*
Affiliation:
Department of Mechanical Engineering, NED University of Engineering and Technology, Karachi, Pakistan
B.A. Zai
Affiliation:
Department of Engineering Sciences, PN Engineering College, National University of Sciences and Technology (NUST), Karachi, Pakistan
*
Corresponding author: T. Jamil; Email: tariqjamil@neduet.edu.pk
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Abstract

In this study a representative sandwich panel is investigated statically in two different configurations under similar bending loads. In one configuration serrations are introduced in the honeycomb core while the other one has un-modified core. Three-point bend test (TPBT) has been performed on both configurations through Finite Element Analysis (FEA) technique using ANSYS Workbench considering American Society for Testing and Materials (ASTM) standards. In both configurations the same aluminium honeycomb core is modelled having an adhesive layer in between adjacent foils to simulate actual scenario instead of relying on the block properties. Honeycomb core offers highest strength in its thickness (T) direction or the z-direction by virtue of its shape. Any distortion in the shape of the honeycomb adversely affects its strength. During bending the honeycomb core witnesses multidirectional forces consequently leading to distortion or crumpling. The serrations in the structure allow bending of the honeycomb core with minimal loss of strength by limiting the deformation to a specific region consequently preserving the shape as well as the strength of the honeycomb core. The results of both samples are compared with respect to deflection, strain and reaction force. It proves that serrated core is more favourable to be used in bent or curved sandwich panels.

Keywords

aluminium honeycomb sandwich structuressandwich panelscarbon fibre prepregthree point bend testbendingadhesiveFEA
Type
Research Article
Information
The Aeronautical Journal , Volume 128 , Issue 1322 , April 2024 , pp. 725 - 738
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Copyright
© NED University of Engineering and Technology, 2023. Published by Cambridge University Press on behalf of Royal Aeronautical Society

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