An Experimental Investigation of a Smart Laminated Composite Beam with a Magnetostrictive Patch for Health Monitoring Applications
An Experimental Investigation of a Smart Laminated Composite Beam with a Magnetostrictive Patch for Health Monitoring Applications
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用于健康监测应用的带有磁致伸缩贴片的智能层压复合梁的实验研究
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发表时间：
2003
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通讯作者：
S. Gopalkrishnan
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作者：
Eslavath Saidha;G. Narayana Naik;S. Gopalkrishnan
本文介绍了一种用于健康监测的嵌入式/表面键合磁致伸缩贴片智能层合复合梁的实验研究。这个概念是基于这样的原理：由于执行器中的感应磁场，传感器上的开路电压（OCV）会由于分层的存在而显示出其振幅的变化。灵敏度研究进行了8层单向层压复合梁试样通过改变其尺寸和位置相对于智能补丁。本研究考虑了表面安装和嵌入式单智能贴片并置传感器-执行器配置以及嵌入式双贴片非并置配置。一个马蹄形线圈的安排正好放置在磁致伸缩贴片是用来在试样中感应磁场。研究表明，在广泛的驱动电流频率范围内，分层的存在极大地改变了传感线圈上的OCV。损伤感应电压（DIV）是传感器在分层前后的OCV之间的差值，表明存在损伤。该电压为毫伏数量级，因此证明了磁致伸缩贴片对分层检测的有效性。实验结果与三维有限元模拟结果吻合较好。研究表明，与非并行配置相比，并行配置更适合于健康监测应用。
This paper presents an experimental investigation of a smart laminated composite beam with embedded/surface-bonded magnetostrictive patches for health monitoring applications. The concept is based on the principle that the Open Circuit Voltage (OCV) developed across a sensor due to an induced magnetic field in an actuator, shows a change in its amplitude due to the presence of delaminations. Sensitivity studies are performed on 8-ply unidirectional laminated composite beam specimens by varying its size and location with respect to the smart patch. Both surface mounted and embedded single smart patch collocated sensor–actuator configuration and an embedded two-patch non-collocated configuration are considered in this study. A horseshoe-type coil arrangement placed exactly over the magnetostrictive patch is used to induce magnetic field in the specimen. The study shows that the presence of delamination considerably alters the OCV across the sensing coil over a wide range of actuating current frequencies. The Damage Induced Voltage (DIV), which is the difference between the OCV across a sensor before and after the delamination, indicates the presence of damage. This voltage is of the order of milli-volts, and hence demonstrating the effectiveness of magnetostrictive patch for delamination detection. The experimental results compare well with the 3-D finite element simulation. The study shows that the collocated sensor–actuator configuration is more suited for health monitoring application compared to non-collocated configuration.