Energy Absorption of Composite Materials.
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CENTER
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This paper results of a study on the energy absorption characteristics of selected composite material systems and compares the results with aluminum. Composite compression tube specimens were fabricated with both tape and woven fabric prepreg using graphiteepoxy GrE, Kevlarepoxy KE and glassepoxy GlE. Chamfering and notching one end of the composite tube specimen reduced the peak load at initial failure without altering the sustained crushing load, and prevented catastrophic failure. Static compression and vertical impact tests were performed on 128 tubes. The results varied significantly as a function of material type and ply orientation. In general, the GrE tubes absorbed more energy than the GlE or KE tubes for the same ply orientation. The 015 GrE tubes absorbed more energy than the aluminum tubes. GrE and GlE tubes failed in a brittle mode and had negligible post crushing integrity, whereas the KE tubes failed in an accordian buckling mode similar to the aluminum tubes. The energy absorption and post crushing integrity of hybrid composite tubes were not significantly better than that of the single material tubes. Author
- Laminates and Composite Materials
- Test Facilities, Equipment and Methods