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Experimental investigation of the impact resistance on KEVLARXP S308® fabric impacted with truncated ogive projectile subjected to pre-tension
Journal
International Journal of Impact Engineering
ISSN
0734743X
Date Issued
2022-05-01
Author(s)
Nayak, Nipanjan
Yerramalli, Chandra Sekher
Tewari, Asim
Abstract
Aramid fabrics made of polymeric chains have wide use in ballistic applications due to their low density, high strength, and their excellent resistive behavior to high strain rate loading like terminal ballistic impact. The response of the aramid yarns depends on yarn architecture, the shape of impacting projectile, and the boundary conditions fabric is subjected to. This work is focused on studying the ballistic response of KEVLARXP S308® manufactured by DuPont. The fabric has a unique +45°/−45° layer sequence with interlaced stitches and would be impacted by a truncated ogive projectile at different levels of fabric pre-tension. A new experimental setup is designed to induce circumferential pre-tension to the fabric and record the fabric's contact force response on impact. The fabric's terminal ballistic parameters like ballistic limit, peak force, time duration, and energy absorption were examined. The ballistic parameters were studied for three different levels of pre-tension, 100 N, 200 N, and 300 N. For each of the pre-tension, the SEM micrograph images were studied for range V30 to V70, and various modes of failure like fibrillation, yarn pull-out, yarn bowing, yarn shearing were analyzed at and near the ballistic limit for both the layers in the fabric. The study findings indicate that the presence of stitches in the fabric restricts the mobility of the yarns in the transverse direction up to a certain extent, and leads to a decrease in the ballistic limit velocity for higher pre-tension value. The analysis of change in peaks of the force-deflection curves in increasing values of impact energy showed the increased strain energy transfer from +45° layer to +45° layer.
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