A Dynamic Investigation of Fiber-Reinforced Viscoelastic Materials

摘要

Many mathematical models have been proposed to describe the local and gross behavior of fiber-reinforced materials. It is the purpose of the report to examine the models that have been proposed for a particular class of fiber composites, and to use the results of a dynamic experimental program to determine their range of applicability and their accuracy. The class of fiber composites chosen for the investigation was elastic, continuous fibers embedded in a linear viscoelastic matrix. The models chosen for consideration employ the macroscopic properties of the constituents to predict the gross properties of the composite. The response of fiber-reinforced viscoelastic materials to dynamic loading may be predicted by two different analytical approaches. The first method uses the constitutive equation that is predicted by the effective modulus analysis and the dynamic field equations to determine the response of the composite. The second method, developed by Bedford and Stern, employs the dynamic moduli of each component with the dynamic continuum theory of mixtures to predict the composite's response. The viscoelastic material chosen for this investigation was Solithane Resin 113. This resin was mixed with Urethane Resin Catalyst C113-300 to form a soft, rubbery material. The resin and catalyst were mixed in a 50/50 ratio (by weight). This matrix was reinforced with roving glass fibers and nylon 66 fibers. (Author)