Crashworthiness of hierarchical circular-joint quadrangular honeycombs. (December 2018)

• Record Type: Journal Article
• Authors: Wu, Yaozhong; Fang, Jianguang; He, Yuhang; Li, Weijia
• Is Part Of: Thin-walled structures. Volume 133(2018)
• Page Start: 180
• Page End: 191
• Publication Date: 2018-12
• Subjects: Honeycomb -- Hierarchy -- Circular-joint -- Energy absorption -- Out-of-plane crushing; Thin-walled structures -- Periodicals; 690.1
• DOI: 10.1016/j.tws.2018.09.044
• Languages: English
• ISSNs: 0263-8231

Abstract

Abstract: The new hierarchical circular-joint quadrangular honeycomb is proposed by iteratively replacing the edge-junctions of regular honeycomb with a circular joint. Firstly, the nonlinear finite element analysis is performed through LS-DYNA and the results are validated by experimental data. Then, analytical solutions to crushing resistance of the hierarchical honeycomb are obtained based on the Simplified Super Folding Element (SSFE) theory. The results between the numerical and analytical method are in good agreement, which indicates that the analytical solutions are reliable. Furthermore, parametric studies of the first and second hierarchical order structures are conducted numerically. The results show that the specific energy absorption of the first and second-order hierarchical honeycomb is improved by up to 81.8%, 115.3% respectively compared with the regular honeycomb. It is also found that the out-of-plane crashworthiness performance of the second-order hierarchical honeycomb can be enhanced by increasing relative density. However, the peak crushing force would also increase with the increase in relative density. The findings of this study show that the proposed hierarchical honeycomb is a structural configuration with high energy absorption capacity. Highlights: A novel hierarchical circular-joint quadrangular honeycomb is proposed. Crashworthiness performances are evaluated by finite element analysis and analytical solutions. The second-order hierarchical honeycomb possesses the best energy absorption. Crashworthiness performances is enhanced by increasing of relative density.