Acoustic Emission Source Location in Fibre Reinforced Plastic Composites

摘要

Acoustic emission (AE) source location in fiber reinforced composite materials is difficult due to the variation of ultrasonic velocity with respect to fiber axes. In general, the location accuracy will depend upon the accuracy with which the AE arrival time is measured, ultrasonic attenuation, anisotropy of the test material, and the size and geometry of the transducer array. A 2-D location algorithm was developed and results are presented for uniaxial and biaxial glass and uniaxial carbon fiber reinforced plastics where the ratio of maximum and minimum velocities were 1.6, 1.2, and 3.9 respectively. The algorithm incorporates the velocity dependence and requires AE event arrival times to calculate the source location using an iterative process.