Compression Properties and Its Prediction of Wood-Based Sandwich Panels with a Novel Taiji Honeycomb Core

Jingxin Hao,Jingxin Wang,Gregory Dahle,Xinfeng Wu,Gloria Oporto-Velasquez

doi:10.3390/f11080886

Abstract

The transverse compression property is one of most important aspects of the mechanical performance of a sandwich structure with a soft core. An experiment, analytical method and three digital strain measurement systems were applied to investigate the compression behavior and the failure mechanism for a wood-based sandwich structure with a novel Taiji honeycomb core. The results show that the structure of the Taiji honeycomb can improve dramatically on compression strength and modulus of composite compared to that of a traditional hexagonal one. There was no obvious deflection in the transverse direction detected by the three digital images before the buckling of the honeycomb occurred. An analytical equation between the key structure parameters and properties of the composite were applied to predict its threshold stresses and modulus. The properties of the core determine the strength of the entire structure, but the compression strength decreases slightly with an elevated core thickness, and its effect on the compression modulus can be neglected. Both the surface sheets and loading speed have little impact on the compression strength and modulus, respectively.

Highlights

Wood-based panels, such as medium density fiber board, particle board, and plywood, are extensively used in the furniture, interior furnishing and packaging product industries, etc
A new type of Taiji honeycomb was fortified on the basis of the traditional hexagonal ones, where in new atype of inside
TimesThere and 2.7 times, respectively, thatin ofthe thetransverse traditionaldirection hexagonal one. by three digital images before was no obvious deflection detected the buckling of the honeycomb occurred

Summary

Introduction

Wood-based panels, such as medium density fiber board, particle board, and plywood, are extensively used in the furniture, interior furnishing and packaging product industries, etc. Those materials fabricated based on formaldehyde-containing glue are harmful to human health and difficult to handle and recycle after usage [1]. The composite can reduce the usage of formaldehyde-containing materials, which would only be applied as face sheets Because of their high stiffness-to-weight and strength-to-weight ratios, sandwich composites have been recently receivinggreat attention [2,3,4,5,6]

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Methods

Discussion

Conclusion