Paper number 1305
EFFECTS OF SALT WATER AGING ON THE POST-IMPACT BEHAVIOR OF POLYMERIC COMPOSITES |
David R. Veazie1, S.W. Park2, and Min Zhou2
1Department of Engineering, Clark Atlanta University, Atlanta, GA 30314, USA
2School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
Summary | The study described in this report uses the split Hopkinson pressure bar (SHPB) apparatus to induce damage in a polymer matrix composite by low-velocity, transverse impact. The configuration used a three-point bend fixture in the SHPB for controlled loading and real-time diagnosis. The material analyzed was a glass-fiber reinforced bismaleimide matrix composite designated S2 glass/5250-4. Experiments were conducted to characterize the response of the composite by relating a range of impact energies to the post-impact tensile strength following salt-water aging. Results showed that following salt-water aging, a monotonic relation exists between the amount of impact energy absorbed by the specimens and both the post-impact tensile strength and the moisture absorbed by the specimens. In the S2 glass/5250-4 system examined, the effects of exposure to 5000 hours of salt-water following impact were minor, illustrating the insignificance of this type of environmental effect on the post-impact tensile strength. |
Keywords | fiber-reinforced composite laminates, time-resolved response, impact damage, salt water aging, residual strength, split Hopkinson pressure bar, damage characterization. |