Structural analysis and strength-to-weight optimization of wood-based sandwich composite with honeycomb core under three
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ORIGINAL
Structural analysis and strength‑to‑weight optimization of wood‑based sandwich composite with honeycomb core under three‑point flexural test Jingxin Hao1,2 · Xinfeng Wu1 · Gloria Oporto2 · Wenjin Liu3 · Jingxin Wang2 Received: 3 May 2019 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Wood-based sandwich composite with a paper honeycomb core, especially for thick boards, has the advantage of high strength-to-weight ratio for the use in lightweight furniture products, interior walls etc. Employing both theoretical and experimental methods, this study investigated the influencing factors of various failure modes and its transition to obtain optimized structural parameters after a quasi-static load was applied. The results reveal that the skins of MDF are too strong for the paper honeycomb core. Both failure modes are caused by weak core properties. If the thickness or strength of the skins could be reduced or the core strength could be reinforced, then optimal failure mode of simultaneous core and skin failure could be reached. The intersection point of three transition lines is the best combination of structural parameters, meaning highest strength-to-weight ratio. At this point, failure of core shear, indentation and face fracture occurs simultaneously. The distance from a structural parameter to intersection is an effective index to express the degree of optimization for the strength-to-weight ratio of composites. Specimens close to the intersection point have optimal structural parameters and high strength-to-weight ratio. On application level, the optimum strength-to-weight ratio could be obtained easily by adjusting the surface or core thickness, if the materials were fixed first.
1 Introduction
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00107-020-01574-1) contains supplementary material, which is available to authorized users. * Wenjin Liu [email protected] * Jingxin Wang [email protected] Jingxin Hao [email protected] 1
College of Material Science and Engineering, Central South University of Forestry and Technology, Changsha, Hunan, China
2
Division of Forestry and Natural Resources, West Virginia University, Morgantown, WV, USA
3
College of Furniture and Art Design, Central South University of Forestry and Technology, Changsha, Hunan, China
A sandwich composite is constructed of two rigid face sheets on either side of a thick, lightweight core. Common materials used for face sheets include metal, plastic, and wood, while the core can be aluminum, plastic, or paper. A benefit of this design is that the sandwich composite has very high bending strength and stiffness relative to its weight (Gibson and Ashby 1988). Sandwich composites have been widely used in the space and marine fields and have spread to civil areas (Gibson and Ashby 1988; Carlsson and Kardomateas 2011). The overall performance of a sandwich composite depends on the properties of its faces, its core materials and their geometric d
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