Compression strength of unidirectional composites: Measurement and prediction
- Imperial Coll. of Science, Technology and Medicine, London (United Kingdom). Dept. of Aeronautics
The present work examines the effect of resin ductility (varied as a function of temperature) on the compressive strength of unidirectional T800/924C carbon fiber-epoxy laminates. Tests are conducted in a screw-driven machine between room temperature and 100 C. Untabbed straight-sided specimens are used in a modified Celanese test rig; conventional serrated grip faces of the Celanese jig are replaced by spark-eroded inserts to eliminate adhesively bonded tabs on the specimen ends and minimize gripping region failures. Test results show that at approximately 80 C the failure mode switches from in-plane to out-of-plane fiber microbuckling. As the test temperature increases the, the shear strength/stiffness of the resin is considerably reduced; this decreases the amount of side support for the fibers and reduces the strain level at which fiber buckling occurs. Recent fracture models are used to predict the compressive strength of the T800/924C system; agreement between theory and experiment is acceptable.
- OSTI ID:
- 675580
- Report Number(s):
- CONF-9605345--
- Country of Publication:
- United States
- Language:
- English
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