Low velocity impact behavior of auxetic CFRP composite laminates with in-plane negative Poisson’s ratio

Abstract

Introducing auxeticity or negative Poisson’s ratio is one potential solution to mitigate the low velocity impact damage of fiber reinforced polymer matrix composites, which can be achieved by tailoring the layup of an anisotropic composite laminate. This study aims to investigate the effect of laminate-level in-plane negative Poisson’s ratio on the low velocity impact behavior of carbon fiber reinforced polymer (CFRP) matrix composites using numerical simulations. The layups of the auxetic composites that allow them to produce negative Poisson’s ratios are identified based on the Classical Lamination Theory and verified through fundamental coupon-level experimental tests. To ensure meaningful comparisons, the non-auxetic counterpart composites are designed by allowing them to produce positive in-plane Poisson’s ratio while closely matching the longitudinal effective modulus of the auxetic laminate. The simulation results indicate that the auxetic laminates suffer smaller (12.6% on average) delamination area in top and bottom interfaces, much smaller (38% on average) matrix compressive damage in the top and bottom plies, and smaller (14.6% on average) fiber tensile damage area in each ply of the laminate at relatively higher impact energies (5 and 8 J).

Experimental and Numerical Analysis of Stitched Composite Laminates Subjected to Low-Velocity Edge-on Impact and Compression after Edge-on Impact

“…The delamination resistance of the composite was improved by inserting stitching or a Z-pin into the laminate, and this method was used to effectively inhibit the extension of delamination cracks. Lin et al [24] and Wang [25] investigated the effect of a negative Poisson's ratio on the low-velocity impact of carbon fiber composite laminates through numerical simulation. The results showed that the negative Poisson's ratio structure helps reduce the tensile damage of the fibers and matrix and the delamination damage area.…”

Crashworthiness of Additively Manufactured Auxetic Lattices: Repeated Impacts and Penetration Resistance

“…While auxeticity is present in nature under different forms [ 2 ], it is common today to artificially produce cellular structures [ 3 , 4 , 5 , 6 ], foams [ 7 ], composite materials [ 8 , 9 , 10 ], and cellular geometries with globally auxetic behavior; the latter are often called auxetic meta-materials. Among the several cellular meta-materials [ 11 ], auxetic materials have recently attracted a lot of interest in multiple fields of engineering [ 12 ].…”

Finite Element Analysis of the Effect for Different Thicknesses and Stitching Densities under the Low-Velocity Impact of Stitched Composite Laminates

“…They revealed that the internal damage was highly dependent on the type and arrangement of the yarns, where the composites with aramid fibers as the warp yarns and carbon fibers as the weft yarns synergistically had the best performance in terms of impact tolerance. Lin et al [ 14 ] and Wang et al [ 15 ] introduced a negative Poisson’s ratio structure to reduce the damage, and the investigation results showed that the fiber and matrix tensile damage of negative Poisson’s ratio structured laminates could be reduced by about 40% under LVI. Moreover, processes such as stitching [ 16 , 17 , 18 , 19 , 20 , 21 , 22 ] and Z-pin [ 23 , 24 , 25 ] could also effectively improve the delamination resistance of composites.…”