Shape memory alloy TiNi fiber epoxy resin composite (SMA-FEC) was developed and the active reinforcement effect of the material was investigated by strain gauge measurement and photoelastic method. In this paper material processing of the SMA-FEC and mechanical testing results are described. The recovery stress-strain at various ambient temperatures by means of strain gauges are reported. A typical shrinkage of the SMA-FEC was recognized with increasing temperature above the inverse transformation temperature Af of embedded SMA TiNi fiber, and it depended on the fiber volume fraction Vf as well as prestrain value. The validity of the composite using the photoelastic model was discussed in detail. By adjusting the fiber volume fraction and prestrain, one can obtain expected elastic modulus and stress fringes value to conduct photoelastic experiment with SMA-FEC as model material. The active reinforcement of the SMA-FEC smart composite was reconfirmed visually from the change of the photoelastic fringe patterns of the specimen by heating at various temperatures.

Issue Section:
Technical Papers
Keywords:
titanium alloys, nickel alloys, fibre reinforced composites, shape memory effects, photoelasticity, recovery, intelligent materials, Young's modulus, Poisson ratio, creep, stress-strain relations, internal stresses
Topics:
Composite materials, Epoxy resins, Fibers, Shape memory effects, Shapes, Stress, Temperature, Diffraction patterns, Creep
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