Experimental and Numerical Investigations on Damage and Delamination in Thick Plain Weave S-2 Glass Composites Under Quasi-Static Punch Shear Loading

Report No. ARL-CR-534
Authors: Bazle A. Gama, Jia-Run Xiao, Md. J. Haque, Chian-Fong Yen, and John W. Gillespie, Jr.
Date/Pages: February 2004; 36 pages
Abstract: Quasi-static punch-shear tests are carried out on plain weave S-2 Glass/SC-15 epoxy composite thick laminates with a blunt impactor. Loadunload tests are carried out to capture different levels of damage mechanisms and the corresponding displacements at which they occur. Energies absorbed at different levels of damage are obtained from the load-unload curves. Two different support spans of 2.54-cm (1-in) and 10-cm diameter (4 in) with 22 layers (thickness 1.321 cm) of plain weave glass/epoxy plates are tested quasi-statically to identify interlaminar shear-dominated and tensile-shear combined modes of damage. After each test, the damaged plates are sectioned to visualize the extent of delamination and material damage. The punch shear tests are simulated using LS-DYNA composite material and delamination models. The modeling is carried out using a newly developed damage model, namely MAT 162, which has been incorporated into LS-DYNA. It uses damage mechanics principles for progressive damage and material degradation. The simulated results show excellent agreement with experimental results. It has been found that the dominant damage mechanisms are delamination and fiber breakage due to shear and tension. This study will be useful for characterizing and predicting damage and ballistic limits of thick-woven composites.
Distribution: Approved for public release
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Last Update / Reviewed: February 1, 2004