The main objective of the ultrasonic non-destructive testing (NDT) applications is to detect dangerous defects in the various constructions. The parameters and geometry of defects is very important information determining lifetime of constructions or components. In conventional ultrasonic NDT methods, based on the measurement of the amplitude and delay time of reflected signal are used. Such an...

the aim of this study is to evaluate the influence of ph on the synthesis of nanocrystallines cobalt ferrite by combination of sol- gel auto combustion and ultrasonic irradiation methods. two different fuels, urea and thiourea, along with metal nitrates (oxidant) were used to prepare cofe2o4 powders. the morphology of the resulting powders was investigated. the powders were characterized by x-r...

Residual stresses are one of the main factors determining failure aircraft engine materials. It is not possible to reliably and accurately predict remaining service life components without properly accounting for presence residual stresses. The absolute level spatial distribution stress uncertain in engines because profile highly susceptible variations manufacturing process. In addition, keep e...

the perovskite-structured la2cuo4 nanoparticles have been synthesized via an ultrasonic-assisted co-precipitation route using octanoic acid as organic surfactant, and the phase composition, morphology, lattice parameters and size of nanoparticles are characterized through fourier transform infrared spectroscopy, x-ray diffraction, scanning electron microscopy and transmission electron microscop...

The paper summarizes the creation of a robust online grain size gauge for hot strip mill. A method and algorithm calculating from measured ultrasonic attenuation is presented. This new self-calibrating, does not rely on geometrical reference sample can cope with effects diffraction attenuation. model based 52 quenched samples more than 23,000 laser ultrasonics shots has correlation coefficient ...

Ultrasonic Non-Destructive Testing (NDT) methods are broadly used for detection and characterization/imaging of cracks. Simulation is great interest designing such NDT methods. To model the ultrasonic 3D response a crack, high frequency asymptotic (semi-analytical) models (such as Physical Theory Diffraction—PTD) known to provide accurate predictions most classical configurations, numerical hav...