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Article

Representative Cell Analysis for Damage-Based Failure Model of Polymer Hexagonal Honeycomb Structure under the Out-of-Plane Loadings

1
School of Mechanical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Johor Bahru 81310, Malaysia
2
Institute for Nanomaterials, Advanced Technologies and Innovation (CXI), Technical University of Liberec (TUL), Studentska 2, 461-17 Liberec, Czech Republic
3
Department of Aerospace Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang 43400, Malaysia
*
Author to whom correspondence should be addressed.
Polymers 2021, 13(1), 52; https://doi.org/10.3390/polym13010052
Received: 20 November 2020 / Revised: 15 December 2020 / Accepted: 16 December 2020 / Published: 25 December 2020
(This article belongs to the Special Issue Damage Mechanics of Polymer Composites)
The honeycomb (HC) core of sandwich structures undergoes flexural loading and carries the normal compression and shear. The mechanical properties and deformation response of the core need to be established for the design requirements. In this respect, this article describes the development of the smallest possible representative cell (RC) models for quantifying the deformation and failure process of the Nomex polymer-based hexagonal HC core structure under the out-of-plane quasi-static loadings. While the hexagonal single and multi-cell models are suitable for the tension and compression, a six-cell model is the simplest RC model developed for shear in the transverse and ribbon direction. Hashin’s matrix and fiber damage equations are employed in simulating the failure process of the orthotropic cell walls, using the finite element (FE) analysis. The FE-calculated load–displacement curves are validated with the comparable measured responses throughout the loading to failure. The location of the fracture plane of the critical cell wall in the out-of-plane tension case is well predicted. The wrinkling of the cell walls, leading to the structural buckling of the HC core specimen in the compression test, compares well with the observed failure mechanisms. In addition, the observed localized buckling of the cell wall by the induced compressive stress during the out-of-plane shear in both the transverse and ribbon direction is explained. The mesoscale RC models of the polymer hexagonal HC core structure have adequately demonstrated the ability to predict the mechanics of deformation and the mechanisms of failure. View Full-Text
Keywords: finite element simulation; Hashin damage criteria; polymer hexagonal honeycomb core; out-of-plane behavior; representative cell model finite element simulation; Hashin damage criteria; polymer hexagonal honeycomb core; out-of-plane behavior; representative cell model
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MDPI and ACS Style

Khan, M.S.; Abdul-Latif, A.; Koloor, S.S.R.; Petrů, M.; Tamin, M.N. Representative Cell Analysis for Damage-Based Failure Model of Polymer Hexagonal Honeycomb Structure under the Out-of-Plane Loadings. Polymers 2021, 13, 52. https://doi.org/10.3390/polym13010052

AMA Style

Khan MS, Abdul-Latif A, Koloor SSR, Petrů M, Tamin MN. Representative Cell Analysis for Damage-Based Failure Model of Polymer Hexagonal Honeycomb Structure under the Out-of-Plane Loadings. Polymers. 2021; 13(1):52. https://doi.org/10.3390/polym13010052

Chicago/Turabian Style

Khan, Muhammad Salman, Ainullotfi Abdul-Latif, Seyed Saeid Rahimian Koloor, Michal Petrů, and Mohd Nasir Tamin. 2021. "Representative Cell Analysis for Damage-Based Failure Model of Polymer Hexagonal Honeycomb Structure under the Out-of-Plane Loadings" Polymers 13, no. 1: 52. https://doi.org/10.3390/polym13010052

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