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Ballistic impact performance of aramid fiber fabric‐epoxy and aramid fiber fabric‐polypropylene (PP)‐based composite laminates has been studied against 7.62 mm armor piercing projectiles. Twaron® was used as aramid fiber fabric in the composites. Role of matrix on the damage pattern has been investigated by impacting the composites of different thickness with projectiles having different strike velocity (SV). Ballistic limit (BL) for each composite has been estimated through correlation of SV and residual velocity (RV) of the projectile by usual V50 method. Ballistic limit was found to vary linearly with composite laminate thickness. Twaron®‐PP composites exhibited higher ballistic limit compared toequivalent thickness of Twaron®‐epoxy composites. Epoxy‐based composites exhibited localized damage mode compared to a global mode of failure in PP‐based composites. Scanning electron microscopy revealed that fibers in Twaron®‐epoxy composites failed largely by shear while tensile mode of failure was observed for Twaron®–PP composites. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers

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Nature armors possess remarkable mechanical properties which results in an ingenious combination of strength and toughness by the virtue of a hierarchical layered microstructure composed of mineral tablets interleaved with organic biomaterials. Here we have demonstrated the unified approach for elucidating the effect of architectural design and its parameter on the mechanical property of dimensionally controlled 3D prototyping of poly­(acrylonitrile-co-butadiene-co-styrene) tri block copolymer. The manipulation of tablet orientation, tailoring the site-specific positions, and interfacially fused interlocks possess the ability to augment the mechanical characteristics of the material. Therefore, it has been observed that the bulk property of the printed ABS sample mainly depends on the type of molluscan shell architecture. For instance, an enhancement in impact (∼45 J/m) and wear properties (friction constant = 0.50 and wear rate 0.00012 × 10−9 m3/Nm) was observed for crossed laminar aragonites compared to the other hierarchical structures. In this work, we have demonstrated the possibility of utilizing naturally available molluscan shell design to alter the mechanical property of 3D printed ABS.

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