Static and vibration properties of randomly oriented shape memory alloy short wires reinforced epoxy resin

Abstract

The static and vibrational properties of randomly oriented shape memory alloy short wires reinforced epoxy resin are determined considering the interface effect between shape memory alloy wires and the resin. First, experimental pull-out test is utilized to obtain the interfacial shear strength between the reinforcement and the matrix. Then, using the finite element simulation, the elastic modulus of the equivalent fiber is determined. Micromechanics model based on Eshelby’s equivalent inclusion and Halpin-Tsai method is used to predict the elastic modulus of shape memory alloy/epoxy composites theoretically. Experimental tensile tests in the present work beside the reported vibration results in the literature are used in order to validate the accuracy of the model. The results showed that ignoring the interface effect in modeling the behavior of shape memory alloy/epoxy composites causes significant errors, especially in high-volume fraction of the shape memory alloy wires. Moreover, the critical aspect ratio of the shape memory alloy wires is obtained as a function of temperature. The critical values for the aspect ratio are about 30, 40 and 42 for 50℃, 25℃ and 0℃, respectively.

Keywords

Shape memory alloy interface effect pull-out micromechanics vibration

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