Bulk Waves for the Nondestructive Inspection of Immersed Structures

2011 ◽  
pp. 643-649
Author(s):  
Elisabetta Pistone ◽  
Piervincenzo Rizzo ◽  
Paul Werntges
Keyword(s):  
Nondestructive Inspection ◽  
Bulk Waves

scholarly journals High-Speed Time- and Frequency-Domain Terahertz Tomography of Glass-Fiber-Reinforced Polymer Laminates with Internal Defects

2021 ◽  
Vol 11 (11) ◽  
pp. 4933
Author(s):  
Ji-Sang Yahng ◽  
Dae-Su Yee
Keyword(s):  
Composite Materials ◽  
Glass Fiber ◽  
High Speed ◽  
Nondestructive Inspection ◽  
Fiber Reinforced Polymer ◽  
Glass Fiber Reinforced Polymer ◽  
Tomographic Images ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Thz Tomography

Composite materials are increasingly being utilized in many products, such as aircrafts, wind blades, etc. Accordingly, the need for nondestructive inspection of composite materials is increasing and technologies that allow nondestructive inspection are being studied. Existing ultrasound methods are limited in their ability to detect defects due to high attenuation in composite materials, and radiographic examination methods could pose a danger to human health. Terahertz (THz) wave technology is an emerging approach that is useful for imaging of concealed objects or internal structures due to high transmittance in non-conductive materials, straightness, and safety to human health. Using high-speed THz tomography systems that we developed, we have obtained THz tomographic images of glass-fiber-reinforced polymer (GFRP) laminates with artificial internal defects such as delamination and inclusion. The defects have various thicknesses and sizes, and lie at different depths. We present THz tomographic images of GFRP samples to demonstrate the extent to which the defects can be detected with the THz tomography systems.

Nondestructive inspection for internal defects of rail based on photoacoustic elastography

2015 ◽  
Author(s):  
Mingjian Sun ◽  
Ying Fu ◽  
Ting Liu ◽  
Xingzhen Cheng ◽  
Guanji Leng ◽  
...  
Keyword(s):  
Nondestructive Inspection ◽  
Internal Defects

scholarly journals The appearance of boundary layers and drift flows due to high-frequency surface waves

2012 ◽  
Vol 707 ◽  
pp. 482-495 ◽  
Author(s):  
Ofer Manor ◽  
Leslie Y. Yeo ◽  
James R. Friend
Keyword(s):  
Boundary Layer ◽  
Surface Waves ◽  
High Frequency ◽  
Slip Boundary Condition ◽  
Inertial Effects ◽  
Velocity Amplitude ◽  
Slip Boundary ◽  
Long Period ◽  
Bulk Waves ◽  
Schlichting Streaming

AbstractThe classical Schlichting boundary layer theory is extended to account for the excitation of generalized surface waves in the frequency and velocity amplitude range commonly used in microfluidic applications, including Rayleigh and Sezawa surface waves and Lamb, flexural and surface-skimming bulk waves. These waves possess longitudinal and transverse displacements of similar magnitude along the boundary, often spatiotemporally out of phase, giving rise to a periodic flow shown to consist of a superposition of classical Schlichting streaming and uniaxial flow that have no net influence on the flow over a long period of time. Correcting the velocity field for weak but significant inertial effects results in a non-vanishing steady component, a drift flow, itself sensitive to both the amplitude and phase (prograde or retrograde) of the surface acoustic wave propagating along the boundary. We validate the proposed theory with experimental observations of colloidal pattern assembly in microchannels filled with dilute particle suspensions to show the complexity of the boundary layer, and suggest an asymptotic slip boundary condition for bulk flow in microfluidic applications that are actuated by surface waves.

Multiattribute Bayesian Acceptance Sampling Plans Under Nondestructive Inspection

1986 ◽  
Vol 32 (6) ◽  
pp. 739-750 ◽  
Author(s):  
Kwei Tang ◽  
Robert Plante ◽  
Herbert Moskowitz
Keyword(s):  
Nondestructive Inspection ◽  
Acceptance Sampling ◽  
Sampling Plans ◽  
Acceptance Sampling Plans

Surface‐wave generation by nonlinear mixing of bulk waves

1979 ◽  
Vol 50 (1) ◽  
pp. 87-90 ◽  
Author(s):  
R. Normandin ◽  
G. I. Stegeman
Keyword(s):  
Surface Wave ◽  
Wave Generation ◽  
Bulk Waves ◽  
Nonlinear Mixing

Nondestructive inspection technology for plant steel structures using magneto-optical images using deep generative models

2021 ◽  
Author(s):  
Ryosuke Hashimoto ◽  
Toshiya Itaya ◽  
Hitoshi Nishimura ◽  
Syunsuke Fukuchi ◽  
Hiroki Kato ◽  
...  
Keyword(s):  
Steel Structures ◽  
Nondestructive Inspection ◽  
Generative Models ◽  
Optical Images

BROAD-BAND lVIICROWAVE DIELECTRIC PROPERTY CHARACTERIZATION AND NONDESTRUCTIVE INSPECTION OF VARIOUS GLASS SPECIMENS

2000 ◽  
Vol 16 (1) ◽  
pp. 55-69 ◽  
Author(s):  
L. Handjojo a ◽  
K. J. Bois a ◽  
J. Bauer b ◽  
R. Hamilton b ◽  
R. Zoughi a
Keyword(s):  
Dielectric Property ◽  
Broad Band ◽  
Nondestructive Inspection ◽  
Property Characterization
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