Acoustic Emission Analysis For Damage Mechanism In Fiber Reinforced Polymer Composite Under Torsional Behaviour

In this study the torsional behaviour of fiber reinforced polymer (FRP) composite rods of different matrix materials like PEEK, Aqua bond, Epoxy are studied and different types of failures are observed. The FRP composite rods are fabricated by using Vacuum Assisted Resin Transfer Moulding (VARTM) method as per the standards. FRP composite rods are tested in the digital torsion testing machine (MT S100NM). The Acoustic Emission (AE) sensors are used to analyse the nature of the cracks. The defects in FRP composite rods are identified, like surface micro cracks, matrix failure and reinforcement failure. After getting AE signals based on different AE Parameters like Time, Frequency, AE hits and AE energy from the obtained results the failure initiation and crack propagation are identified, Hence the AE method is best suitable technique for identify the micro failures.