Creep, cracks, delaminations, and material identification.
Case study: Detection of kissing bonds in friction stir welds.
The Thetagram is produced by our Pulse Inversion NDT system. This applies two time-separated swept-frequency pulses and records the responses of the test-piece. These two responses are summed to produce a residual waveform. If the test-piece has a linear response (i.e. is free of cracks) the residual will be zero. If the test-piece contains cracks, the response will be non-linear and the residual will contain harmonics of the input signal. No conventional NDT system (including X-ray) can provide this level of detection sensitivity. Theta’s mission is to create customer solutions to specific NDT problems in the manufacture, maintenance and management of both composite and traditional materials, and bonds and welds between them.