Title: Improving Damage Tolerance of Plain Weave S-2 Glass Thick-Section Composites Subjected to High Energy Impact

Authors: Paul D. Samuel, Bazle Z. (Gama) Haque, Nicholas Shevchenko, Aristedes Yiournas, Shashank Sharma, Shridhar Yarlagadda, Daniel J. O’Brien and John W. Gillespie Jr.

DOI: 10.33599/nasampe/s.22.0829

Abstract: Delamination failure in thick-section composites subjected to high energy impact results in a substantial loss of residual stiffness and strength that can degrade structural and multi-hit ballistic performance. In these applications, damage may occur within layers, and more critically as delamination between layers. In this paper, we show that interlayer toughening eliminates delamination in the thick-section composite panel and also significantly improves damage-tolerance. Plain-weave S-2 glass/SC15 epoxy thick-sections (with and without interlayers) are fabricated (nominal specs: 711.2 mm x 711.2 mm in-plane, 28-32 mm thickness and areal weight of 50-55 kg/m2) and tested in a large drop tower at an impact energy of 7.4 kJ. Digital Image Correlation (DIC) was used to measure deflection and strains on the back-face. Through-transmission C-Scans show pronounced delamination failure in the baseline panel, whereas no delamination was observed in the panel with interlayers, indicative of very high durability. The retention of original stiffness in the baseline was found to be 44% while the toughened panel emerged highly damage-tolerant with 91% of original stiffness retained.

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Conference: SAMPE 2022

Publication Date: 2022/05/23

SKU: TP22-0000000829

Pages: 16

Price: $32.00