David K. Hsu

TL;DR: Although conventional wisdom calls for special conditions, such as non-stoichiometry, metastable disorder or doping to achieve some ductility in intermetallic compounds at room temperature, none of these is required in these unique B2 rare-earth compounds.

TL;DR: In this article, the wave propagation in carbon fiber reinforced plastics (CFRP) containing voids is analyzed using ultrasonic measurement results, and the relationship between the ultrasonic attenuation and dispersion is subsequently tested using the local form of the Kramers-Kronig relation.

TL;DR: In this paper, an axially symmetric Bessel function pattern is polarized into a piezoelectric ceramic element and the resulting circular disk transducer has the usual full-plating electrode configuration, but produces an ultrasonic beam with a radial displacement profile approximating that of the bessel function J0 (r), both in amplitude and in phase.

TL;DR: In this article, four different configurations of pulse echo and through transmission are described for the simultaneous velocity and thickness determination, and the method is then applied to investigate the porosity content in graphite/polyimide and graphite-epoxy composite laminates.

TL;DR: The PMN-PT single crystal ultrasonic transducer shows considerably improved performance in sensitivity over the PzT and PZT-based 1-3 composite ultrasonic Transducers.