Abstract
In order to estimate locations of micro-cracks in CFRP-tank during pressurization testing, we developed a source location method for utilizing AE signals. A 4-ch system of 150kHz resonant-type AE sensors was used for the source location. We first investigated the orientation dependence of AE signals in the tank by using artificial sources. Lamb-mode dispersive AE signals were monitored and arrival times to the sensor were defined by the times to maximum 90kHz-wavelet coefficients from each signal. We then investigated the effect of AE signals via liquid in the tank on source location results. Damage monitoring zone was set to the tank, and AE signals from non-monitoring zone were separated from those from monitoring zone by duration. Source location algorithm was proposed in this paper and accuracy of proposed method was discussed using artificial sources at variable points both in the monitoring and non-monitoring zone. Eighty percent of AE signals from non-monitoring zone were correctly separated from AE signals from monitoring zone. Source location of artificial source was estimated by the proposed method. Location of artificial source was identified with average error of 17.8 [mm] except 4 large error points.
