Paper number 1305
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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. |