Abstract
The temperature dependence of the linear expansion coefficients in the longitudinal (α l) and transverse directions\((\alpha _{t_1 } and \alpha _{t_2 } )\) of unidirectional glass fibre laminates and their matrix resins (α m) has been studied. The results for the dry, fully post-cured polyester, epoxy resins and laminates have been found to be consistent with the predictions of the Schapery equations. An anomalous moisture phenomenon, in the form of a peak in theα m (T)/T andα t (T)/Tcurves for the polyester resin and laminates has been observed. A difference between\(\alpha _{t_1 }\) and\(\alpha _{t_2 }\) has been observed for partially cured polyester laminates, which is also perturbated in the presence of water. Both these moisture effects, which are not found in the epoxy specimens, are considered to result from a two-phase polyester matrix and the latter to continued curing below the softening point of the resin. These results have a considerable consequence on the magnitude of the thermal strains which develop in polyester composites.
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Jones, F.R., Mulheron, M. & Bailey, J.E. Generation of thermal strains in GRP. J Mater Sci 18, 1522–1532 (1983). https://doi.org/10.1007/BF01111973
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DOI: https://doi.org/10.1007/BF01111973