Qhobosheane Relebohile George, Elenchezhian Muthu Ram Prabhu, Das Partha Pratim, Rahman Minhazur, Rabby Monjur Morshed, Vadlamudi Vamsee, Reifsnider Kenneth, Raihan Rassel
Department of Mechanical and Aerospace Engineering, University of Texas at Arlington, Arlington, TX 76019, USA.
Institute of Predictive Performance and Methodologies, University of Texas at Arlington Research Institute, Fort Worth, TX 76118, USA.
Sensors (Basel). 2020 Dec 3;20(23):6906. doi: 10.3390/s20236906.
This research work focuses on the development of a piezoelectric magnetostrictive smart composite with advanced sensing capability. The composite piezoelectric property is achieved from the dispersion of single-walled carbon nanotubes (SWCNTs) and the magnetostrictive property from Terfenol-D nanoparticles. Finite element analysis (FEA) is used to examine the feasibility of modelling the piezoelectric (change in electric field) and magnetostrictive (change in magnetic field) self-sensing responses in the presence of applied stress. The numerical work was coupled with a series of mechanical tests to characterize the piezoelectric response, magnetostriction response and mechanical strength. Tensile tests of the composite samples manufactured as is (virgin), samples with SWCNTs, samples with Terfenol-D nanoparticles and samples with both SWCNTs and Terfenol-D nanoparticles were conducted. It was observed that an increase in volume fraction of Terfenol-d nanoparticles increases the change in magnetization, therefore increasing voltage response up to the point of saturation. The optimum change in amplitude was observed with 0.35% volume fraction of Terfenol-D nanoparticles. A constant ratio of SWCNTs was maintained, and maximum change in electrical resistance was at 7.4%. Fracture toughness for the samples with all nanoparticles was explored, and the results showed improved resistance to crack propagation.
本研究工作聚焦于开发一种具有先进传感能力的压电磁致伸缩智能复合材料。复合材料的压电性能通过单壁碳纳米管（SWCNTs）的分散来实现，磁致伸缩性能则由Terfenol-D纳米颗粒赋予。有限元分析（FEA）用于检验在施加应力的情况下对压电（电场变化）和磁致伸缩（磁场变化）自传感响应进行建模的可行性。数值工作与一系列力学测试相结合，以表征压电响应、磁致伸缩响应和机械强度。对原样制造的（未添加其他成分的）复合材料样品、添加SWCNTs的样品、添加Terfenol-D纳米颗粒的样品以及同时添加SWCNTs和Terfenol-D纳米颗粒的样品进行了拉伸测试。观察到Terfenol-d纳米颗粒体积分数的增加会使磁化变化增大，从而使电压响应增加直至饱和点。在Terfenol-D纳米颗粒体积分数为0.35%时观察到最佳的幅度变化。SWCNTs的比例保持恒定，电阻的最大变化为7.4%。对所有含有纳米颗粒的样品的断裂韧性进行了探究，结果表明其抗裂纹扩展能力有所提高。
