Viscoelastic Properties of Silica Fibre Reinforced Epoxides and a Theory of Fracture of Fibre Reinforced Viscoelastic Materials

摘要

The report describes the measurement of shear modulus and damping of epoxy resin samples undirectionally reinforced with silica fibers. The measurements were performed over a temperature range including the glass-rubber transition of the resin on samples cut with fibers at various angles to the specimen axis. Fiber concentrations up to 74% were used. The report presents a theory of fracture of unidirectional fiber reinforced materials in which the rate at which elastic energy, released by fiber breakage, can be absorbed, is calculated. Analogies of fiber reinforcement theory and chain fracture theories in polymers are discussed. (Author Modified Abstract)