Results 221 to 230 of about 99,487 (264)

Wideband dispersion reversal of lamb waves

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2014
Ultrasonic 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, Dean, Ta, Bo, Hu, Pascal, Laugier, Weiqi, Wang   +4 more
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Material interface inspection by lamb waves

International Journal of Solids and Structures, 1997
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Kundu, T., Maslov, K.
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Lamb wave interaction with light

Journal of Applied Physics, 1985
The interaction of light with Lamb waves propagating in transparent plates has been investigated. The analytical study has been done by considering a three-step interaction, at the limiting surfaces and within the propagation medium. Experimental data are given, relative to isotropic crystal plates in the MHz frequency regions and compared with theory.
A. Alippi, P. Diodati, D. Maccari, G. Socino   +3 more
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Damage Identification Using Lamb Waves

Key Engineering Materials, 2010
The concept of damage detection using sensors in composite panels is of growing interest, due to the reduction in maintenance activity and increasing of the aircraft safety. Piezoelectric materials have been widely used to build a variety of transducers for activating and receiving Lamb waves which are used for delamination/damage detection. The aim of
Z. Sharif-Khodaei, Ferri M.H.Aliabadi
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Lamb-wave electroacoustic voltage sensor

Journal of Applied Physics, 1985
The effect of a bias electric field on the phase velocity of Lamb waves propagating in a piezoelectric plate has been investigated in order to develop an electroacoustic voltage sensor. Experiments were performed on YX and YZ LiNbO3 Lamb-wave delay lines, used as the stabilizing element in the feedback loop of an oscillator, by measuring the fractional
Palma A, Palmieri L, Socino G, Verona E
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Contact scanning Lamb wave tomography

The Journal of the Acoustical Society of America, 1998
Lamb waves are guided ultrasonic waves capable of propagating relatively long distances in platelike structures such as airframe skins, storage tanks, and pressure vessels. Their propagation depends on frequency thickness and material properties, and, because structural flaws present changes in effective thickness and/or material properties, Lamb waves
Mark Hinders, Eugene Malyarenko, James McKeon   +2 more
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Subsonic lamb waves in anisotropic layers

Journal of Applied Mathematics and Mechanics, 2001
According to \textit{H. Lamb} [Proc. Roy. Soc. London. Ser. A. 93, No. 648, 114-128 (1917)] a harmonic wave consists of several partial waves of the form \[ u_k = m_ke^{ir\gamma_k x\cdot v}e^{ir(n\cdot x -ct}.\tag{1} \] The author shows that in the case of the Lamb wave propagating with subsonic velocity in anisotropic layers the representation (1 ...
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Lamb waves and lamination detection

Ultrasonics, 1967
Abstract Lamb waves at the fundamental, and of higher orders, can be excited with sufficient intensity for lamination detection in thick plates if large-area probes and long acoustic pulses are used. Hot-rolled steel plates up to 16mm in thickness can be tested, and clear and unambiguous results obtained.
E. Lehfeldt, P. Höller
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Lamb wave-based acoustofluidics

The Journal of the Acoustical Society of America
Both bulk acoustic wave (BAW) and surface acoustic wave (SAW) acoustofluidic technologies have been widely utilized for particle manipulation. However, within fluid, these waves tend to propagate as bulk waves or leaky bulk waves, resulting in undesirable acoustic streaming that causes unstable particle manipulation.
Feiyan Cai, Jiaqi Liu, Hairong Zheng
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Gel-coated Lamb wave sensors

IEEE Symposium on Ultrasonics, 2002
Initial experiments and theory describing the operation of gel-coated Lamb wave sensors are described. The lowest-order flexural Lamb wave can propagate in gel-coated plates with low attenuation. This allows some novel sensing approaches to be investigated, such as: using gels as filters for larger particles and molecules, while allowing smaller ...
B.J. Costello, S.W. Wenzel, A. Wang, R.M. White   +3 more
openaire   +1 more source