Manufacturing and mechanical properties of composite orthotropic Kagome honeycomb using novel modular method
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RESEARCH ARTICLE
Bin NIU, Shijie LI, Rui YANG
Manufacturing and mechanical properties of composite orthotropic Kagome honeycomb using novel modular method
© The Author(s) 2020. This article is published with open access at link.springer.com and journal.hep.com.cn
Abstract This work deals with manufacturing and analysis of orthotropic composite Kagome honeycomb panels. A novel modular mold is proposed to manufacture carbon fiber reinforced composite Kagome honeycombs. The designed mold can be assembled freely to manufacture Kagome honeycombs with different configuration combinations and can realize easy demolding. Furthermore, two typical fiber placement methods are considered during the fabrication process, from which the more effective fiber placement method is determined. Finally, representative volume element method is used to perform homogenization analysis of the Kagome honeycomb panels and to obtain equivalent in-plane and bending stiffness. Finite element analysis using these equivalent properties is conducted and validated against the experimental results of the manufactured composite Kagome honeycomb panels under different loading cases. Keywords composite, Kagome honeycomb, manufacturing, placement of fibers, equivalent stiffness
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Introduction
Composite honeycombs have excellent mechanical properties, such as low weight, high strength, and high loadcarrying capacity; they have been widely used in many industrial fields in recent years [1,2]. Currently, typical honeycomb structures include hexagonal honeycomb, triangular honeycomb, and Kagome honeycomb [3–7]. Compared with other honeycombs, a composite Kagome honeycomb consists of hexagonal and triangular configurations; it is hybrid honeycomb and has balanced in-plane Received November 18, 2019; accepted April 20, 2020
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Bin NIU, Shijie LI, Rui YANG ( ) Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education, School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China E-mail: [email protected]
and out-of-plane properties. Different from bendingdominated foam, stretching-dominated Kagome honeycombs have relatively high weight efficiency [8]. This finding is caused by the difference between composite Kagome honeycomb and other types of honeycomb in the fabricating method, mechanical properties, and application. Therefore, Kagome honeycomb has attracted remarkable attention of researchers as a novel ultralight multifunctional structural material. Kagome honeycomb is one of the most attractive honeycomb configurations, and many methods are developed for its design. Deshpande et al. [8] found that Kagome honeycomb is a stretching-dominated honeycomb. They presented the topology design criterion of 2D honeycomb. Totaro and Gürdal [9] proposed a Kagome honeycomb optimization method for realizing minimum mass solution under buckling and strength constraints. Niu et al. [10] developed a two-scale topology optimization method to obtain optimum macrostructure and material microstructure for maximu
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