In-plane crushing behavior of density graded cross-circular honeycombs with zero Poisson's ratio. (June 2020)

• Record Type: Journal Article
• Authors: Wu, Hexiang; Zhang, Xinchun; Liu, Ying
• Is Part Of: Thin-walled structures. Volume 151(2020)
• Publication Date: 2020-06
• Subjects: Cross-circular honeycombs -- Dynamic crushing -- Symmetry gradient design -- Energy absorption -- Finite element analysis; Thin-walled structures -- Periodicals; 690.1
• DOI: 10.1016/j.tws.2020.106767
• Languages: English
• ISSNs: 0263-8231

Abstract

Abstract: By combining circular cells and folded plates, this paper establishes a cross-circular honeycomb model. The model has a simple micro-topological structure. Through theoretical analysis and numerical simulation, we derive a semi-empirical equation describing the plateau stresses of cross-circular honeycombs and investigate their in-plane impact behavior. Hence, this paper primarily discusses the effect of gradient arrangement on the deformation mode, plateau stress, and energy absorption capacity of hollow-circular and cross-circular honeycombs with the same relative density at different impact velocities. The study results indicated that the deformation mode of the cross-circular honeycombs exhibited a zero Poisson's ratio, and these honeycombs exhibited a high plateau stress and high capacity for energy absorption. A density graded design could control the dynamic response characteristics of the cross-circular honeycombs within a wider range of impact velocities. Furthermore, the design of the symmetric gradient distribution provided the density graded cross-circular honeycombs with a multi-directional gradient deformation characteristic. Highlights: A new cross circular honeycombs with zero Poisson's ratio was established. A formula for the plateau stresses of cross-circular honeycombs is offered. A new gradient design with symmetry along positive direction in plane was presented. The energy absorption capacity of honeycombs was improved greatly.