Abstract
In a long uniaxial glass fibre/epoxy resin composite that is constrained by a rigid outer shell not to change its overall external dimensions, the transverse components of principal stress generated during cooling from the temperature of cure have been measured at various distances from the specimen ends. The radial (compressive) and hoop (tensile) components of stress in the resin between four fibres whose axes define the edge of a prism with square section are in excess of 6 and 100 MPa, respectively. In an identical specimen, 4 days of exposure to distilled water at 80° C was found to give rise to a tensile hoop stress of magnitude sufficient to cause fracture of the rigid outer shell.
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References
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Cunningham, B., Sargent, J.P. & Ashbee, K.H.G. Measurement of the stress field created within the resin between fibres in a composite material during cooling from the cure temperature. J Mater Sci 16, 620–626 (1981). https://doi.org/10.1007/BF02402778
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DOI: https://doi.org/10.1007/BF02402778