Development of large-movements and high-force electrothermal bimorph actuators based on aligned carbon nanotube reinforced epoxy composites
Development of large-movements and high-force electrothermal bimorph actuators based on aligned carbon nanotube reinforced epoxy composites
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DOI：
10.1016/j.sna.2017.10.051
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发表时间：
2017-11
影响因子：
4.6
通讯作者：
K. Shirasu;G. Yamamoto;Y. Inoue;T. Ogasawara;Y. Shimamura;T. Hashida
中科院分区：
文献类型：
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作者：
K. Shirasu;G. Yamamoto;Y. Inoue;T. Ogasawara;Y. Shimamura;T. Hashida
采用高杨氏模量、负热膨胀系数的定向多壁碳纳米管（MWCNT）增强环氧复合材料和铝箔，制备了新型电热双晶片致动器。u型双晶片致动器是通过切割复合材料/铝层压板的中间部分形成的，其中mwcnt对齐方向平行于u型双晶片致动器的长度方向。研究结果表明，自由长度为16 mm的双晶片驱动器在直流电压为5.2-6.0 V时具有较大的弯曲位移和力输出，其值为7.6-10.0 mm和0.8-7.8 mN。在此基础上，结合材料强度理论和混合规律（Voigt模型和Turner模型）对双晶圆作动器的弯曲位移和力输出进行了建模。通过使用这些模型，我们指出了两个因素对双晶圆致动器中弯曲位移和力输出的增加的贡献：(i)通过控制MWCNT体积分数和双晶圆致动器的尺寸参数（特别是厚度）来设计复合层的杨氏模量和负CTE；（ii）选择杨氏模量高、CTE大的材料作为第二层。
By using aligned multi-walled carbon nanotube (MWCNT) reinforced epoxy composites possessing a negative coefficient of thermal expansion (CTE) as well as high Young’s modulus and aluminum foils, novel electrothermal bimorph actuators are fabricated. U-shaped bimorph actuators are formed by cutting out the middle part of the composite/aluminum laminates, where the MWCNT-aligned direction is parallel to the length direction of the U-shaped bimorph actuators. We demonstrate that the bimorph actuators with a free length of 16 mm show a large bending displacement and force output, and their values are 7.6–10.0 mm and 0.8–7.8 mN under a DC voltage of 5.2–6.0 V. Based on these results, the bending displacement and force output of the bimorph actuator are modeled by combining strength-of-materials theories and rule of mixtures (Voigt model and Turner’s model). By using these models, we indicate contributions from two sources toward the increased bending displacement and force output in the bimorph actuator: (i) designing the Young’s modulus and negative CTE of the composite layer by controlling the MWCNT volume fraction and the dimensional parameters (especially thickness) of the bimorph actuator; (ii) selecting materials having a high Young’s modulus as well as a large CTE as the second layer.