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

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.