Investigation on the dynamic behavior of composite gradient double‐arrow auxetic structure under local impact load

Abstract

Based on the design concept of functionally graded materials, the composite gradient double-arrow auxetic structures were designed and fabricated. The thickness of core layers demonstrates an increasing trend for positive gradient structure, while a decreasing trend for negative gradient structure. The thickness of core layers keeps constant for homogeneous structure. The dynamic response and failure modes of the double-arrow auxetic structure with different gradient distributions of wall thickness were obtained by foam projectile impact experiments. The influence of the gradient distribution of core wall thickness on the impact resistance of composite double-arrow auxetic structures under local impact load was investigated. The results demonstrated that the gradient distribution of core wall thickness has an important influence on the dynamic response and failure modes of the structure. The negative gradient auxetic structure revealed more excellent impact resistance compared with the positive gradient auxetic structure. In addition, the response of the gradient double-arrow auxetic structure under local impact load was simulated by ABAQUS/Explicit, and the simulation results were in good agreement with the experimental results. Combined with the experimental and numerical simulation results, it was found that the negative gradient distribution of core wall thickness had an obvious improvement on the impact resistance of composite double-arrow auxetic structure under local impact load.

The effect of convexity in energy absorption of E‐glass reinforced epoxy composites under high velocity impact: An experimental and numerical investigation

“…The researchers observed that the distribution of thickness gradients in the multi-layered composite wall, with layers of different thicknesses, had a significant influence on the dynamic response and failure modes of the structure. 25 Meymand et al studied the collapse behavior of cylindrical aluminum energy absorbers that were partially or fully hybridized with glass fibers and epoxy resin during lowvelocity impact. The researchers found that the fully hybridized samples exhibited the highest energy absorption.…”

“…Zeng et al examined the response and failure modes of multi‐layered composite laminates with varying thicknesses during high‐velocity impact tests. The researchers observed that the distribution of thickness gradients in the multi‐layered composite wall, with layers of different thicknesses, had a significant influence on the dynamic response and failure modes of the structure 25 …”

Low velocity impact performance of 3D auxetic composites embedded with re‐entrant triangle inclusions

“…With these enhanced properties, auxetic composites are prominent in various applications such as protective equipment and energy absorption materials 6–9 . Since Milton et al 10 indicated the possibility of manufacturing of auxetic composite laminates with the Poisson's ratio (PR) of −1, many researches have been focused on the development of auxetic composites and the studies of their energy absorption ability and impact resistance performance 11–17 …”

“…[6][7][8][9] Since Milton et al 10 indicated the possibility of manufacturing of auxetic composite laminates with the Poisson's ratio (PR) of À1, many researches have been focused on the development of auxetic composites and the studies of their energy absorption ability and impact resistance performance. [11][12][13][14][15][16][17] The impact resistance performance of different types of auxetic composites and auxetic structures has been assessed via both high-velocity and low-velocity impact tests by various researchers. [18][19][20][21][22][23][24] Alderson and Coenen 25 studied the low velocity impact response of different carbon fiber reinforced polymer (CFRP) laminates including conventional CFRP laminates and auxetic CFRP laminates.…”

Comparative analysis of Poisson's ratio of 2D woven constructions and their composites produced from different auxetic geometries

“…A lot of research has been carried out on the development of different auxetic geometries and their respective synthetic auxetic materials. [ 32–36 ] It is also reported that different auxetic geometries result in different values of NPR. Kim et al proposed a rotating polygonal prism structure, where the value of n is varied as 3, 4, and 6, which deforms by the relative rotation of the n‐gonal component prism units and gave an analytical model for predicting the Poisson's ratio of the three structures.…”