Ultrasound-based determination of fatigue, damage and degradation

Ultrasound-based determination of fatigue, damage and degradation [Pg.364]

Laser-induced US spectroscopy has been used to study the effect of microcracks in rock specimens on non-linear distortion of the elastic pulse shape [57]. [Pg.365]

Comparison of several techniques (namely Fourier transform infrared spectroscopy (FTIR), simultaneous thermogravimetric analysis-differential scanning calorimetry (TGA-DSC) and ultrasonic spectroscopy) for assessing the residual physical and mechanical characteristics of polymer matrix composites (PMCs) exposed to excessive thermal loads showed the measured power spectra of ultrasonic energy to correlate with performance of graphite fibre epoxy matrix composites exposed to thermal degradation, and also that analyses with the three techniques all pointed to the same critical temperature at which thermally induced damage increased sharply [58], [Pg.365]

Complementary studies based on measurements of US-velocity changes and Raman spectroscopy were performed on bulk single-crystalline silicon irradiated with high doses of fast neutrons and compared with the non-irradiated material this revealed the presence of tunnelling states in highly coordinated bulk silicon [59], [Pg.365]

Membrane compaction and fouling-cleaning studies by ultrasonic time-domain refiectometry [Pg.365]