A magnetostrictive ferromagnet–polymer composite consisting of steel wires suspended in a polymer matrix has been developed that exhibits large reversible magnetostrictive strain in relatively low magnetic fields. The strain for a fixed field is a nonmonotonic function of wire loading for the longer wires investigated, and the strain for a given wire loading increases with decreasing the wire length. Within the limits of this study, a maximum saturation strain of 60.2% in a 7.5 kOe field was observed with a wire length of 0.50 cm and a wire volume fraction of approximately 0.2. No degradation in strain was observed over the maximum number of 50 expansion cycles.

中文翻译：

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铁磁-聚合物复合材料中的巨大可逆磁致伸缩

已经开发出一种由悬浮在聚合物基体中的钢丝组成的磁致伸缩铁磁体-聚合物复合材料，该复合材料在相对较低的磁场中表现出较大的可逆磁致伸缩应变。对于所研究的较长导线，固定场的应变是导线载荷的非单调函数，并且给定导线载荷的应变随着导线长度的减少而增加。在本研究的范围内，在 7.5 kOe 场中观察到 60.2% 的最大饱和应变，导线长度为 0.50 cm，导线体积分数约为 0.2。在 50 次膨胀循环的最大次数内未观察到应变降低。