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  • Articles  (5)
  • ultrasonics  (5)
  • Springer  (5)
  • Annual Reviews
  • Wiley
  • Wiley-Blackwell
  • 2005-2009
  • 2000-2004
  • 1990-1994  (3)
  • 1980-1984  (2)
  • 2008
  • 1992  (3)
  • 1982  (2)
  • Electrical Engineering, Measurement and Control Technology  (5)
  • Natural Sciences in General
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  • Articles  (5)
Source
Keywords
Publisher
  • Springer  (5)
  • Annual Reviews
  • Wiley
  • Wiley-Blackwell
Years
  • 2005-2009
  • 2000-2004
  • 1990-1994  (3)
  • 1980-1984  (2)
Year
Topic
  • Electrical Engineering, Measurement and Control Technology  (5)
  • Natural Sciences in General
  • Mathematics  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Quantitative use of Rayleigh waves to locate and size subsurface holes (1982)
    Springer
    Journal of nondestructive evaluation 3 (1982), S. 55-63 
    Details
    ISSN: 1573-4862
    Keywords: ultrasonics ; Rayleigh waves ; subsurface defects ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract An ultrasonic inspection method is used to obtain the circumference of a subsurface hole and the depth of the hole below the surface. A pitch-catch Rayleigh wave transducer set-up was used to launch a Rayleigh surface wave at the flaw and to capture and record the scattered waves. The frequency spectrum of the scattered waves can be used to obtain the depth of the hole. The ligament of material between the hole and the surface is sent into resonance, and this feature can be extracted from the scattered waves' frequency spectrum. The frequency is a function of the ligament length; thus the hole depth can be obtained. The circumference of the hole is found from a time of flight measurement. A Rayleigh wave is formed that travels around the hole's surface. The length of time required for the wave to travel around the hole is a measure of the circumference.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566955
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  • 2
    Electronic Resource
    Electronic Resource
    A comparative study of transient waves in random (polycrystalline) media (1992)
    Springer
    Journal of nondestructive evaluation 11 (1992), S. 9-17 
    Details
    ISSN: 1573-4862
    Keywords: Casuality ; effective medium ; ultrasonics ; polycrystalline medium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract The paper investigates the transient response of a random medium as predicted by two methods, a perturbation scheme and a causal approach. It is shown by direct computation of a pulse propagation that the perturbation scheme yields an “advanced” response inconsistent with the physical realizability of the medium. The causal model as well as a modified perturbation scheme exhibit a physically reasonable behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566013
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrasonic flaw classification in weldments using probabilistic neural networks (1992)
    Springer
    Journal of nondestructive evaluation 11 (1992), S. 69-77 
    Details
    ISSN: 1573-4862
    Keywords: Welds ; flaw classification ; ultrasonics ; neural networks
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract A probabilistic neural network is used here to classify flaws in weldments from their ultrasonic scattering signatures. It is shown that such a network is both simple to construct and fast to train. Probabilistic nets are also shown to be able to exhibit the high performance of other neural networks, such as feed forward nets trained via back-propagation, while possessing important advantages of speed, explicitness of their architecture, and physical meaning of their outputs. Probabilistic nets are also demonstrated to have performance equal to common statistical approaches, such as theK-nearest neighbor method, while retaining their unique advantages.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00568290
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  • 4
    Electronic Resource
    Electronic Resource
    Analysis of nonlinearly viscoelastic behavior of adhesive bonds (1992)
    Springer
    Journal of nondestructive evaluation 11 (1992), S. 221-226 
    Details
    ISSN: 1573-4862
    Keywords: Nonlinear viscoelastic behavior ; adhesive layers ; ultrasonics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract The purpose of this paper is to provide a theoretical framework to study the nonlinear viscoelastic behavior of adhesive layers. The stress-strain behavior of the adhesive material in shear is assumed to have a nonlinear elastic part and a linear viscoelastic part, i.e., σ yx =f(ε yx )+K mεyx. To measuref(ε yx ) andK m by an ultrasonic technique, it is proposed to prestress the adhesive layer in the nonlinear range and to superimpose a small amplitude ultrasonic signal. The reflected field is used to obtain the wave speed and hencedf(ε yx )/dε yx as a function of the pre-stress. The viscoelastic parameter is obtained from the amplitude decay. By repeating this procedure for various values of prestress and using numerical integration, the stress-strain behavior of the adhesive layer can be reconstructed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566412
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  • 5
    Electronic Resource
    Electronic Resource
    Loss of specular reflection due to nonlinear crack-face interaction (1982)
    Springer
    Journal of nondestructive evaluation 3 (1982), S. 229-239 
    Details
    ISSN: 1573-4862
    Keywords: Crack-opening displacement ; crack closure ; ultrasonics ; Kirchoff approximation ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract The interaction between rough crack faces is modeled by nonlinear relations between the crack-face tractions and the crack-opening displacements. These relations account for crack closure and for the related resistance to crack-face sliding. The relations are used to investigate reflection and transmission of an incident pulse by an infinite flaw plane. The problem statement is reduced to a set of inhomogeneous nonlinear ordinary differential equations for the displacement discontinuities, [u] and [v], across the flaw plane. These equations have been solved numerically. The reflection and transmission of an incident pulse by a crack with interacting crack faces. Both incident longitudinal and transverse waves have been considered. The loss of specular reflection as compared to a perfect (traction-free) crack is exhibited by specific examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00565867
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