Flexural Fatigue Response of Repaired S2-Glass/Vinyl Ester Composites

Report No. ARL-TR-4912
Authors: Uday K. Vaidya; Biju Mathew; James M. Sands
Date/Pages: August 2009; 26 pages
Abstract: Vacuum-assisted resin transfer molding is a promising, affordable technique for producing composite integral armor (CIA) and thick-section composites for U.S. Army-relevant applications. Among several constituents, the CIA uses S2-glass/epoxy and/or S2-glass/vinyl ester composites in its construction. The S2-glass-reinforced composite provides ballistic protection and load bearing due to the flexural loading caused from vehicle movement over various terrains. The S2-glass-reinforced composite is subjected to different levels of delamination when impacted by projectiles. The present study focuses on the repair of S2-glass/epoxy composites subjected to a clean perforation type of ballistic impact scenario and post-repair flexural response of the composite panels. Simple repair solutions involving the use of different plugs reinforcing the damage (12.7-, 25.4-, and 38.1-mm [0.5-, 1-, and 1.5-in] clean perforations) have been implemented in S2-glass/vinyl ester laminates. Static and fatigue tests were conducted under flexural loading. The effects of implementing the repair strategies on the flexure performance have been reported.
Distribution: Approved for public release
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Last Update / Reviewed: August 1, 2009