Large Magnetostriction in Epoxy-Bonded Terfenol-D Continuous-Fiber Composites with [112] Crystallographic Orientation

In this work, the processes for making continuous fibers and their composites were discussed. The magnetic and magnetostrictive properties of a 50-vol% continuous-fiber composite were reported, together with a monolithic Terfenol-D, as a function of magnetic field with zero stress bias. A short-fiber composite and a particulate composite, both with about 50-vol% Terfenol-D, were also prepared and characterized for comparison. The continuous-fiber composite has the largest lambdas of 1270 ppm, which is about 14, 23, and 93% larger than the monolithic Terfenol-D, short-fiber composite, and particulate composite, respectively. The higher lambdas when compared to monolithic Terfenol-D is mainly attributed to the residual compressive stresses developed in the fibers during epoxy curing.