Compression resilience and impact resistance of fiber‐reinforced sandwich composites

Abstract

This paper presents an experimental investigation on the compression behavior of fiber-reinforced sandwich composites. In this study, five different types of sandwich composites were prepared with warp knitted spacer fabric as middle layer. Four different types of woven Kevlar fabric structures were used as outer layers (skin) along with one sample of woven basalt fabric. The middle layer used is 100% polyester spacer fabric. Sandwich composites were fabricated using epoxy resin by wet layup method under vacuum bagging technique. Compression behavior, ball burst, and knife penetration were tested for all samples. The effect of outer layer of these composites on the mechanical performance was studied using the compression stressstrain curves. It is known that spacers have excellent compression elasticity and cushioning. Maximum knife penetration resistance is obtained with twill weave on surface because of maximum yarn cohesion and resin impregnation. Higher amount of cohesive friction results in higher resistance against penetration of sharp objects like the knife edge. Plain and twill fabrics offer sufficient resistance again ball burst.The yarn deformation allows formation of dome shape after ball impact. Maximum impact resistance in ball burst is obtained for plain weave because of highest level of interyarn binding. The results provide new understanding of knitted spacer fabricbased sandwich composites under compression and impact loading condition.

Factors influencing the ballistic impact mechanisms of textile composite materials: a review

“…Several natural fibers are mixed with synthetic fibers and hybridized for making the composite armor even cheaper and enhance the ballistic protection capabilities like Kevlar with Kenaf, 83 Kevlar with Basalt, 84 a more detailed study for natural and hybrid fibers are investigated by Safri et al 28 The fibers elastic energy storage mainly controls the energy absorption of the projectile. Numerous advancements have been achieved by improving the fiber's failure strain.…”

“…On the other hand, Intra‐ply hybridization includes the usage of different fiber bundles in parallel in the single lamina. Numerous inter‐ply research is available, which highlights the usage of different combinations of Kevlar and glass, 77,151‐153 carbon and Kevlar, 154 Kevlar and graphite 155‐157 Kevlar with Kenaf, 83 Kevlar with Basalt 84 and Kevlar, carbon and glass with different stacking sequences 158‐160 . All the analyses are with either unidirectional (UD) or 2D woven composites.…”

Comparative analysis of mechanical behavior of 3D woven spacer sandwich composites with single and double level structures

“…[9,12] The energy was maximum with lower thickness of such structures as the samples became compact. [13] Additionally, higher core pile height made the core weak, which reduced the skin crippling threshold in flexural loading. [8] Although these structures proved to be advantageous in some respects compared to conventional sandwich structures, these are not strong enough under flexural loads.…”

Finite element analysis of hybrid 3D orthogonal woven composite subjected to ballistic impact with multi‐scale modeling

“…On the other hand, intra‐ply hybridization includes usage of different fibers bundles in parallel in the single lamina. Numerous inter‐ply research is available, which highlights the usage of different combinations of Kevlar and glass, 6‐8 carbon and Kevlar, 9 Kevlar with Kenaf, 10 Kevlar with Basalt, 11 and Kevlar, carbon and glass with different stacking sequences 12‐14 . All the analyses are with either unidirectional (UD) or 2D woven composites.…”