Summary
Glass/Epoxy and Carbon/Epoxy unidirectional composite materials have been subjected to cyclic ondulated loading of three points bending specimens. The viscoelastic properties of the new or damaged materials are recorded with a Polymer laboratories PL/DMTA viscoelasticimeter working at 10 Hz. The viscoelastic behavior of samples subjected to various dynamic shear strains has also been investigated with a computer driven Metravib viscoanalyser.
The results show that under fatigue stresses, glass/epoxy interface has permanent damage leading to large damping while carbon/epoxy one seems to have only intermittent damage leading to lower damping and better fatigue properties.
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Gerard, J.F., Hamelin, H., Merle, G. et al. Viscoelastic investigation of interfacial damage of glass and carbon fibers composite materials. Polymer Bulletin 16, 559–566 (1986). https://doi.org/10.1007/BF00255227
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DOI: https://doi.org/10.1007/BF00255227