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  • Artikel  (3)
  • Rayleigh waves  (3)
  • 2020-2022
  • 2010-2014
  • 1980-1984  (3)
  • 1975-1979
  • Elektrotechnik, Elektronik, Nachrichtentechnik  (3)
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  • Artikel  (3)
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  • 1
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): ultrasonics ; Rayleigh waves ; subsurface defects ; NDE
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Mathematik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00566955
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 2
    Digitale Medien
    Digitale Medien
    Application of metal single crystal wedges to high frequency rayleigh wave propagation (1981)
    Springer
    Journal of nondestructive evaluation 2 (1981), S. 231-239 
    Details
    ISSN: 1573-4862
    Schlagwort(e): Rayleigh waves ; Ge and Al surfaces ; high frequency ultrasonic surface waves ; nondestructive evaluation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Mathematik
    Notizen: Abstract Techniques for propagating Rayleigh waves with frequencies varying from 〈1 to 270 MHz were developed for the purpose of nondestructive evaluation of composition or defect gradients near the surface of nonpiezoelectric solids. The surface waves with frequencies greater than 15 MHz were obtained from a novel technique using single crystal wedges, whereas the low frequency waves were produced by a previously used high voltage impulse. Measurements of Rayleigh wave velocities on single crystals of Ge and Al were performed as a test of accuracy and precision and are compared with calculated values.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00570735
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    Surface acoustic wave measurements of surface cracks in ceramics (1981)
    Springer
    Journal of nondestructive evaluation 2 (1981), S. 219-229 
    Details
    ISSN: 1573-4862
    Schlagwort(e): acoustics ; surface acoustic waves ; Rayleigh waves ; ceramics ; surface cracks ; residual stresses ; crack extension ; NDE
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Mathematik
    Notizen: Abstract An investigation of scattering from surface cracks has been conducted. In particular, the change in the reflection coefficient of a Rayleigh wave incident on a surface indentation crack has been measured as the sample is stressed to fracture. The acoustic measurements have been correlated with the stable crack extension that precedes final failure. The crack extension behavior of as-indented specimens was found to differ appreciably from that of annealed specimens. Cracks in the annealed samples exhibited partial crack tip closure, but little stable extension, whereas cracks in the as-indented samples displayed both crack closure and irreversible crack growth. This behavior has been rationalized by invoking concepts based upon the residual stresses created by indentation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00570734
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
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