基于RFID的SMA增强复合材料层合板无线监测方法及实验

Wireless monitoring method and experiments for SMA reinforced composite laminates based on RFID

将无线射频识别技术(RFID)引入结构健康监测领域,提出了利用传感标签和读写器实现结构健康无线监测的新方法。以埋入环氧树脂复合材料结构中具有一定规格和布局的NiTi形状记忆合金(SMA)超弹丝作为电容器的电极,分布的RFID传感标签实时获取形状记忆合金丝间的微小电容信号,并将其与时间、位置编码信息打包后无线传输给读写器和监控站点。对两种SMA增强复合材料层合板,分别在万能材料试验机和冲击试验机上进行了拉伸、弯曲和冲击实验,结果表明,系统能实现对埋入结构中NiTi超弹性传感元件的高精度监测,并具有功能扩展方便、路由选择与定位简单的特点。

The radio frequency identification technology was introduced into the area of structure health monitoring, and a new wireless monitoring method for SMA reinforced epoxy composite laminates was proposed by using sensor-tags and reader. Using the SMA wires as the capacitor electrodes and the sample matrix as the dielectric, the capacitance signals were measured and packaged with the current time and address information by sensor-tags, then transmitted to the monitoring station by reader networks. For two kinds of NiTi reinforced composite laminated board, the tensile test, bending test and impact experiment were conducted in universal material testing machine and impact testing machine, respectively. The results show that the system can monitor the outputs by embedded hyperelastic wires in composite structures, and it has the characteristics of good expansibility, simple routing and easy positioning.