Evaluation of the inverse magnetostrictive effect in heat‐treated Fe‐Co wire/polymer composites

Abstract

In recent years, the innovative technology of energy harvesting from ambient energy (eg, shock or vibration) has become necessary for Internet of Things (IoT) wearable devices. Moreover, these devices are expected to be lightweight, robust, and have a high efficiency of energy conversion. In this study, magnetostrictive polymer composites were fabricated with as‐drawn or heat‐treated Fe‐Co wires. Mechanical tests and analyses were conducted to investigate their stress‐rate‐dependent sensor characteristics, and cyclic compression tests were carried out to measure the output voltage of these samples. A simple nonlinear magnetomechanical coupling model of the magnetostrictive wire/polymer composites was used to predict the internal stress in the wire. The experimental results showed that the output voltage density of the heat‐treated Fe‐Co wire/polymer composite was larger than that of the as‐drawn one, and the heat treatment enhanced the inverse magnetostrictive characteristics of the Fe‐Co wire.

Stress monitoring capability of magnetostrictive Fe–Co fiber/glass fiber reinforced polymer composites under four-point bending

“…Additionally, other researchers have studied magnetostrictive polymer composites for SHM applications [28][29][30][31] . Fe-Co alloy (Fe 29 Co 71 ) exhibits ductility and good workability; therefore, Fe-Co wires have been implanted in epoxy resin to invent original magnetostrictive epoxy composite materials utilizing the high aspect ratio of Fe-Co wires [32][33][34][35] . The studies have mainly investigated the magnetostrictive response to compressive stress.…”

Magnetostrictive Fe-Co Integrated Composites for Kinetic Energy Harvesting

“…されている．さらに，センサへの応用を目指し，Fe Ga/ Fe Co 積層材料 (8) ，AlN/Fe Co 積層材料 (9) ，Tb Dy Fe/ Fe Co 積層材料 (10) や Fe Co コーティング (11) が開発されて いる他，Fe Co 系マイクロワイヤの応力誘起磁壁移動に関 する研究 (12) (13) ． e 33 ＝s 33 s 33 ＋( (13) ，引張残留応力 (16) ，初期バイアス磁場 (17) ，熱処理温 度 (17) などに依存して変化する． 最近，Fe Co ファイバーとポリエステルファイバーとの 織物材を用いてエポキシ樹脂複合材料が作製され，圧縮・三 点曲げ荷重による磁束密度変化が計測されている (18) ．Fe Co ファイバーは，磁気異方性が高い上，縦弾性係数がエポ キシ樹脂と大きく異なるため，複合材料にすることで，外力 を作用させると Fe Co ファイバーのみに大きな応力が生じ る (13) (26) ，切欠き (27) および初期バイアス磁場方向 (28)…”