Results 201 to 210 of about 737,665 (254)
Some of the next articles are maybe not open access.
IEEE Symposium on Ultrasonics, 2002
Tomographic imaging of the condition of tin materials has been performed using Lamb waves. Lamb waves were generated in thin sheets of aluminum submerged in water using an immersion transducer set at the critical angle. An identical transducer at a fixed separation detected energy radiated back into the water by the propagating Lamb wave.
D.P. Jansen, D.A. Hutchins
openaire +1 more source
Tomographic imaging of the condition of tin materials has been performed using Lamb waves. Lamb waves were generated in thin sheets of aluminum submerged in water using an immersion transducer set at the critical angle. An identical transducer at a fixed separation detected energy radiated back into the water by the propagating Lamb wave.
D.P. Jansen, D.A. Hutchins
openaire +1 more source
Long-Wave Asymptotics of Lamb Waves
Mechanics of Solids, 2017The six-dimensional complex formalism is used to obtain equations for determining long-wave asymptotics of symmetric fundamental modes of Lamb waves in an anisotropic layer. Analytic expressions are obtained for long-wave asymptotics of phase velocities of Lamb waves propagating in an isotropic layer.
R. V. Goldstein, S. V. Kuznetsov
openaire +1 more source
Journal of Applied Mathematics and Mechanics, 2009
The author presents results of an analysis of the velocity and the polarization of acoustic Lamb waves propagating in the directions of elastic symmetry of one- and two-layer anisotropic media at small vanishing frequencies (soliton-like waves). The method of fundamental matrices is used for the construction of a solution.
openaire +2 more sources
The author presents results of an analysis of the velocity and the polarization of acoustic Lamb waves propagating in the directions of elastic symmetry of one- and two-layer anisotropic media at small vanishing frequencies (soliton-like waves). The method of fundamental matrices is used for the construction of a solution.
openaire +2 more sources
Ultrasonic Lamb wave diffraction tomography
Ultrasonics, 2001Ultrasonic guided waves, Lamb waves, allow large sections of aircraft structures to be rapidly inspected. Unlike conventional ultrasonic C-scan imaging that requires access to the whole inspected area, tomographic algorithms work with data collected over the perimeter.
E V, Malyarenko, M K, Hinders
openaire +2 more sources
Scattering of Lamb waves by a circular cylinder
The Journal of the Acoustical Society of America, 2001Following our previous attempt at the scattering from a cylinder in a slab to the incidence of a guided shear wave, we hereby discuss the scattering by an elastic cylinder embedded in an isotropic plate for a variety of bonding states to incidence of the fundamental Lamb wave modes S0 and A0 at the low-frequency regime.
X M, Wang, C F, Ying
openaire +2 more sources
Air-coupled Lamb wave tomography
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 1997An entirely air-coupled inspection system using a pair of micromachined silicon capacitance transducers has been used to image defects in thin plates of different materials (0.7 mm to 2.22 mm thick) using air-coupled Lamb wave tomography. A filtered back projection algorithm was used in a form of difference tomography to reconstruct images of defects ...
W, Wright +3 more
openaire +2 more sources
Material interface inspection by lamb waves
International Journal of Solids and Structures, 1997zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Kundu, T., Maslov, K.
openaire +1 more source
Wideband dispersion reversal of lamb waves
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2014Ultrasonic guided waves have been widely acknowledged as the most promising tools for nondestructive evaluation (NDE). However, because of the multimodal dispersion, the received guided modes usually overlap in both time and frequency, which highly complicates the mode separation and signal interpretation.
Kailiang, Xu +4 more
openaire +2 more sources
Efficient laser generation of Lamb waves
Optics Letters, 2014We report about the efficient generation of Lamb waves for nondestructive testing (NDT) of carbon fiber reinforced plastics (CFRP) with spatially formed laser beams. Therefore we describe the successful introduction of a liquid crystal on silicon (LCoS)-based spatial light modulator (SLM) to create predetermined spatial laser light distributions for a ...
Philipp, Huke +4 more
openaire +2 more sources
Decoherence of lamb waves by rough interface
IEEE Ultrasonics Symposium, 2005., 2006Propagation of Lamb waves in elastic plate with a periodic grating on one interface has shown an attenuation which can be interpreted as a phenomenon of decoherence. In order to verify this hypothesis, a simplified model is considered, where a fluid plate with a limited periodic grating on one interface is studied by the finite element method (ATILA ...
Bavencoffe, M. +4 more
openaire +2 more sources