Date of Award
1994
Degree Name
M.S. in Mechanical Engineering
Abstract
Post failure analysis of the impacted 12.7 mm thick S-2 glass composite panels (150x150 mm) was performed to study the failure modes during penetration. The panels were impacted projectiles (4.5 g) with three different nose shapes (blunt, conical and hemispherical) at velocities 250-600 m/s and impact data was reported in an earlier study. The back-face deflection of the laminates was also recorded in that study with the Imacon high speed camera at 105 f7s. Post failure analysis revealed that the laminates failed during penetration by cratering due to punching of fibers, laminate crushing, delamination and fiber stretching and breaking. The extent of failure modes varied with strike velocity of the projectile. Stress based failure criteria were proposed for these failure modes. Impact of the blunt nose projectiles on to S-2 glass laminate was simulated by incorporating the failure criteria in DYNA3D code. Simulated ballistic limit of the laminate and residual velocities o f the blunt nose projectiles agreed within 10% of the experimental results. However, the same failure criteria failed to predict the ballistic limit o f 6.4 mm thick S-2 glass laminates impacted by 5.8, 17, and 44 grain projectiles.
Keywords
Composite materials Impact testing, Laminated materials Impact testing, Glass fibers Impact testing
Rights Statement
Copyright © 1994, author
Recommended Citation
Rathnam, Kandasamy, "High velocity impact studies on S-2 glass laminated composites" (1994). Graduate Theses and Dissertations. 5097.
https://ecommons.udayton.edu/graduate_theses/5097
