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Tunable characteristics of bending resonance frequency in magnetoelectric laminated composites 下载免费PDF全文
As the magnetoelectric (ME) effect in piezoelectric/magnetostrictive laminated composites is mediated by mechanical deformation, the ME effect is significantly enhanced in the vicinity of resonance frequency. The bending resonance frequency (fr) of bilayered Terfenol-D/PZT (MP) laminated composites is studied, and our analysis predicts that (i) the bending resonance frequency of an MP laminated composite can be tuned by an applied dc magnetic bias (Hdc) due to the E effect; (ii) the bending resonance frequency of the MP laminated composite can be controlled by incorporating FeCuNbSiB layers with different thicknesses. The experimental results show that with H dc increasing from 0 Oe (1 Oe=79.5775 A/m) to 700 Oe, the bending resonance frequency can be shifted in a range of 32.68 kHz≤fr≤33.96 kHz. In addition, with the thickness of the FeCuNbSiB layer increasing from 0 μm to 90 μm, the bending resonance frequency of the MP laminated composite gradually increases from 33.66 kHz to 39.18 kHz. This study offers a method of adjusting the strength of dc magnetic bias or the thicknesses of the FeCuNbSiB layer to tune the bending resonance frequency for ME composite, which plays a guiding role in the ME composite design for real applications. 相似文献
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通过傅里叶变换从新的角度考察了光学非均匀单向纤维增强复合材料的偏振光学行为,发现其光强I-方位角θ曲线主要仅由不多于三种基波组成,它们是零次(常量)、二次和四次基波。研究结果表明:四次基波的模与主应力差有很好的相关性,在所进行的实验条件下,四次基波的模都按正弦平方曲线规律随主应力差的增减而单调变化;并发现四次基波的初相角α∥4与双折射方向一致。在此基础上提出了复会材料双折射率,△Nc的概念。这一结果不仅对进一步认识纤维复合材料的复杂偏振光学现象可能有意义,而且也
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金属基高温超导体复合材料临界电流密度的估算 总被引:1,自引:0,他引:1
对由高温超导体微块嵌于金属基中而形成的复合体的临界电流密度 J_c 进行了估算.结果表明,J_c 与金属基的电导率、超导体的非等轴性以及复合体中超导体的含量成正比.在判据 1μv/cm 和金属基电阻率为 10~(-7)Ωcm 的条件下,77K 和零场下的 J_c 值可超过10~4A/cm~2.指出了复合体其他的优点. 相似文献
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纳米复合材料发展趋势 总被引:21,自引:0,他引:21
系统总结了近二三年来国内外纳米复合材料研究的状况,并对纳米复合材料发展的趋势和新动向进行评述,指出它的研制是纳米材料工程的重要组成部分,由于应用目标明确,在纳米涂层材料,高力学性能材料,高分子基纳米复合材料,磁性材料,光学材料,高介电材料及仿生材料等方面将有突破性进展,成为世纪之交纳米材料科学中最为活跃的领域之一。 相似文献