Abstract
Simple shear tests have been performed on four different types of resins (cyanate and epoxy-based) which are usually employed for carbon composites. Unexpectedly, all the resins exhibited an intensive plastic response, even at room temperature. Most of the specimens could undergo, at least in their central part, a local shear strain as large as about 0.5. Their constitutive behaviour is very similar to those of glassy thermoplastics — visco-elastic stage, strain softening, shear banding, strain hardening, ultimately homogeneous strain and rupture. It appeared thatτ y decreases withT g. The results are discussed in terms of the molecular mechanisms of plasticity. Some consequences on the micromechanics of fibre-reinforced composites are also presented.
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G'sell, C., Jacques, D. & Favre, J.P. Plastic behaviour under simple shear of thermosetting resins for fibre composite matrices. J Mater Sci 25, 2004–2010 (1990). https://doi.org/10.1007/BF01045756
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DOI: https://doi.org/10.1007/BF01045756