Thermomechanical behaviour of interfacial region in carbon fibre/epoxy composites

• Published in: Composites. Part A, Applied science and manufacturing Vol. 27; no. 11; pp. 1067 - 1074
• Main Authors: Pegoretti, A., Della Volpe, C., Detassis, M., Migliaresi, C., Wagner, H.D.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 1996; Elsevier
• Subjects: Applied sciences; Composites; dynamic mechanical thermal properties; Exact sciences and technology; Forms of application and semi-finished materials; fragmentation test; interphase; Polymer industry, paints, wood; Technology of polymers; temperature; temperature; fragmentation test; interphase; dynamic mechanical thermal properties; Fiber reinforced material; Epoxy resin; Thermomechanical properties; Interface; Composite material; Carbon fiber; Fragmentation
• ISSN: 1359-835X; 1878-5840
• DOI: 10.1016/1359-835X(96)00065-6

A study of the thermomechanical stability of the fibre-matrix interphase in carbon/epoxy composites has been carried out. The thermodynamic work of adhesion has been evaluated at room temperature by wetting measurements. The interfacial shear stress transfer level 〈τ〉 for sized and desized carbon fibre has been measured as a function of temperature by means of a single-fibre fragmentation test. As the test temperature increased 〈τ〉 values were found to decrease, with values being higher for the desized carbon fibre. The dependence of interfacial shear stress transfer on bulk matrix mechanical properties (modulus and shear strength) has also been discussed. Dynamic mechanical measurements performed on single-bundle composites confirmed the better thermomechanical stability of the desized fibre interphase.