Abstract
Magnetostrictive materials have a wide variety of applications due to their great capability as sensors and energy-harvesting devices. However, their brittleness inhibits their applications as magnetostrictive devices. Recently, we developed a continuous magnetostrictive Fe-Co-fiber-embedded epoxy matrix composite to increase the flexibility of the material. In this study, we fabricated random magnetostrictive Fe-Co short fiber/epoxy composite sheets. It was found that the discontinuous Fe-Co fiber composite sheet has the magnetostrictive properties along the orientation parallel to the length of the sheet. Finite element computations were also carried out using a coupled magneto-mechanical model, for the representative volume element (RVE) of unidirectional aligned magnetostrictive short fiber composites. A simple model of two-dimensional, randomly oriented, magnetostrictive short fiber composites was then proposed and the effective piezomagnetic coefficient was determined. It was shown that the present model is very accurate yet relatively simple to predict the piezomagnetic coefficient of magnetostrictive short fiber composites. This magnetostrictive composite sheet is expected to be used as a flexible smart material.
Highlights
Magnetostrictive materials are widely used in many fields as sensors, actuators, energy-harvesting devices, etc
Nonlinear behavior was observed in the direction parallel to the length of the sheet, the behavior was nearly linear in the direction vertical to the length of the sheet
This result indicates that the discontinuous Fe-Co fiber/epoxy composite sheet shows a higher permeability in the direction parallel to the length compared to the vertical direction
Summary
Magnetostrictive materials are widely used in many fields as sensors, actuators, energy-harvesting devices, etc. [1]. To begin addressing the magnetostrictive effect of the Fe-Co fiber, Narita [12] successfully developed magnetostrictive fiber/polymer composites by embedding Fe-Co fibers, with a diameter of 1 mm in an epoxy matrix and investigated the effect of residual stress on the stress-rate dependent output voltage of the composites due to cyclic compressive loads. The magnetic induction change of the developed fiber-reinforced polymer composite was comparable to that of bulk Terfenol-D. The flexibility of these composites is not good enough to meet the requirement of wearable applications, it is necessary to develop a lighter and more flexible composite material [18,19] In this investigation, we developed discontinuous Fe-Co fiber/epoxy composite sheets and investigated their magnetic and magnetostrictive properties. The numerical predictions were compared with the test data and the results were examined to give some insights into the magnetostrictive properties of the composites
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