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  • Articles  (6)
  • cracks  (6)
  • Springer  (6)
  • Copernicus
  • Oxford University Press
  • 2010-2014
  • 1980-1984  (6)
  • 1950-1954
  • Electrical Engineering, Measurement and Control Technology  (6)
Collection
  • Articles  (6)
Source
Keywords
Publisher
  • Springer  (6)
  • Copernicus
  • Oxford University Press
Years
Year
Topic
  • Electrical Engineering, Measurement and Control Technology  (6)
  • Mathematics  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Defect identification and sizing by the ultrasonic satellite-pulse technique (1980)
    Springer
    Journal of nondestructive evaluation 1 (1980), S. 263-276 
    Details
    ISSN: 1573-4862
    Keywords: Ultrasonics ; scattering ; diffraction ; defect characterization ; cracks ; voids ; pattern recognition ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract Shape and size are the most important defect characteristics that need to be determined for the reliable prediction of the remaining service lifetime of a defective structure or part. The analytical and supporting experimental results presented in this paper concern a general, pattern recognition-based, ultrasonic defect identification and sizing method. The satellite-pulse technique (SPT) is based on the interpretation, in terms of defect types (shapes) and dimensions, of the separation in time of arrival between the readily detected specularly reflected pulse and its generally ignored tip-diffracted or tangentially scattered “satellite” contained in the received waveform. Calibration procedures were also developed that enable the ultrasonic examiner to read the time scale of the oscilloscope for equivalent crack depth or void diameter as appropriate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00571807
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of sinusoidal crack-face perturbations on scattering of elastic waves (1981)
    Springer
    Journal of nondestructive evaluation 2 (1981), S. 153-159 
    Details
    ISSN: 1573-4862
    Keywords: ultrasonics ; scattering ; cracks ; periodic surface perturbation ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract The scattering of a plane longitudinal wave from a two-dimensional crack, with a sinusoidal surface perturbation whose amplitude and wavelength are much smaller than the length of the crack, is investigated. The amplitude of the cylindrical body waves in the far field are calculated from a Kirchhoff approximation that utilizes the solution to the reflection from the sinusoidal surface profile of a semiinfinite solid. The results are compared to those for a flat crack, and conditions for significant differences of the amplitude as a function of the angle of observation are discussed. Characteristic changes in the scattered field produced by profiles with different amplitudes and periods are explained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00570727
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  • 3
    Electronic Resource
    Electronic Resource
    Elastic wave diffraction by elliptical cracks: Theory and experiment (1980)
    Springer
    Journal of nondestructive evaluation 1 (1980), S. 87-99 
    Details
    ISSN: 1573-4862
    Keywords: ultrasonics ; diffraction ; cracks ; titanium ; spectrum analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract Analytical solutions to the diffraction of elastic waves by elliptical cracks in titanium are compared with experimental results. The analysis is based on physical elastodynamic theory and is valid forka≫1 and in the far field. A digitized ultrasonic spectrum analysis system is used to measure the frequency components of broadband waves diffracted from elliptical cracks with aspect ratios (ratio of major to minor axes) ranging from 1 to 8. The amplitude spectra show good agreement between experiment and theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566117
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  • 4
    Electronic Resource
    Electronic Resource
    Scattering of ultrasound in solids as visualized by the photoelastic technique (1984)
    Springer
    Journal of nondestructive evaluation 4 (1984), S. 65-73 
    Details
    ISSN: 1573-4862
    Keywords: ultrasonic scattering ; photoelastic visualization ; cylindrical cavities ; creeping wave ; cracks ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract Our efforts in the past few years to visualize the scattering of ultrasound in solids by the photoelastic technique are briefly reviewed. Photoelastic photographs are presented showing the dynamic processes of scattering in glass of plane longitudinal or transverse waves by a cylindrical cavity or cavities as well as by two-dimensional surface-breaking or internal cracks. Phenomena like creeping and multiple scattering are clearly seen, in addition to some details which are not predicted by known theories.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566398
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  • 5
    Electronic Resource
    Electronic Resource
    Fatigue lifetime prediction with the aid of SAW NDE (1980)
    Springer
    Journal of nondestructive evaluation 1 (1980), S. 123-136 
    Details
    ISSN: 1573-4862
    Keywords: fatigue life ; acoustic surface waves ; NDE ; ultrasonics ; cracks
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract The present studies concentrated on predicting the remaining fatigue life for single fatigue cracks in the Paris regime of macrocrack propagation. Acoustic surface waves were used to interrogate the crack during cyclic fatigue. The inversion of the obtained scattering data provided crack depth and crack length as a function of the number of cycles applied in tension-tension fatigue. Auxiliary experiments were conducted to study the acoustic response of the crack to tensile and compressive loads, thought to open and close the crack. The technique may allow for new insights into the physics of the “crack closure” effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566120
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  • 6
    Electronic Resource
    Electronic Resource
    Ultrasonic evaluation of geometrical and surface parameters of rough defects in solids (1980)
    Springer
    Journal of nondestructive evaluation 1 (1980), S. 249-261 
    Details
    ISSN: 1573-4862
    Keywords: Ultrasonics ; cracks ; surface roughness ; diffraction ; scattering ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract Ultrasonic measurements from rough cracks were carried out using both broad-band and narrow-band methods. An analysis is suggested to determine parameters of the crack quantitatively such as size, shape, rms surface roughness, and distribution function of the surface roughness. Ultrasonic measurements of the parameters compare very well with the actual parameters of the defect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00571806
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