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  • Articles  (6)
  • elastic waves  (3)
  • fracture  (3)
  • 2010-2014
  • 1980-1984  (6)
  • 1975-1979
  • 1950-1954
  • Electrical Engineering, Measurement and Control Technology  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Numerical modelling of the scattering of elastic waves in plates (1984)
    Springer
    Journal of nondestructive evaluation 4 (1984), S. 89-106 
    Details
    ISSN: 1573-4862
    Keywords: scattering ; elastic waves ; Lamb waves ; shear waves ; finite difference methods ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract This paper describes the application of finite difference methods to the calculation of the scattering of elastic waves. The emphasis is on cracklike defects in plates, and it is shown that a common numerical technique can span a range of wavelengths from Lamb waves to ultrasonic waves with many reflections from the surfaces of the plate. Quantitative results are given for the scattering of Lamb waves and ultrasonic shear waves from surface-breaking cracks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566400
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Accept/reject decisions and failure prediction for structural ceramics: Application to failure from voids (1980)
    Springer
    Journal of nondestructive evaluation 1 (1980), S. 37-52 
    Details
    ISSN: 1573-4862
    Keywords: failure prediction ; accept/reject decisions ; ceramic materials ; ultrasonics ; fracture ; probabilistic model ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract A general probabilistic method for reaching accept/reject decisions and failure prediction based on nondestructive evaluation procedures is described. The method is illustrated for ceramic materials that fail by the activation of microcracks located at void surfaces. The inspection procedure used for the analysis is the long wavelength ultrasonic method. The analysis indicates influences on the decision level and on the false-reject probability of variations in the signal-to-noise ratio and in the preexistent void population. The ultrasonic inspection is shown to exert a relatively minor influence on the false-reject probability, even for low signal-to-noise ratios, low stresses, and a widely dispersed void population, because of the intrinsic variability of the selected failure process. More encouraging results concerning the utility of NDE are anticipated to apply to other failure mechanisms in ceramics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566230
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  • 3
    Electronic Resource
    Electronic Resource
    Evaluation of pipeline girth welds using low-frequency horizontally polarized waves (1982)
    Springer
    Journal of nondestructive evaluation 3 (1982), S. 155-173 
    Details
    ISSN: 1573-4862
    Keywords: elastic waves ; electromagnetic transducers ; nondestructive evaluation ; ultrasonic transducers ; ultrasonic scattering ; ultrasonic waves ; wave phenomena
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract The practical implementation of alternative acceptance criteria for pipeline girth welds requires the use of inspection tools capable of determining the principal dimensions and positions of planar flaws. A new ultrasonic inspection method is described that permits complete volumetric inspection of the girth welds. The new system uses noncontacting electromagnetic-acoustic transducers (EMATs) that operate at low ultrasonic frequencies (454 kHz). Theoretical models of the measurements are developed and verified experimentally. In addition, practical performance limits of the new system are established in terms of minimum flaw sizes that can be detected. The results are related to accept-reject curves based on a model of the failure processes. An inspection protocol for field applications is also described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566557
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  • 4
    Electronic Resource
    Electronic Resource
    Probabilistic models for defect initiated fracture in ceramics (1980)
    Springer
    Journal of nondestructive evaluation 1 (1980), S. 111-122 
    Details
    ISSN: 1573-4862
    Keywords: ceramics ; fracture ; Si3N4 ; inclusions NDE ; accept/reject decisions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract Fracture tests on hot-pressed silicon nitride containing voids and several types of inclusion have been conducted. Fracture models pertinent to each defect type have been proposed and correlated with the data. The specificity of the fracture models is emphasized, and the various trends with defect size that result from the models are described. The resultant fracture probability relations are one of the key inputs to accept/reject decisions for nondestructive failure prediction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566119
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  • 5
    Electronic Resource
    Electronic Resource
    On the acoustic emission due to the fracture of brittle inclusions (1980)
    Springer
    Journal of nondestructive evaluation 1 (1980), S. 149-155 
    Details
    ISSN: 1573-4862
    Keywords: acoustic emission ; fracture ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract The far-field characteristics of the emission from a theoretical model for the fracture of brittle inclusions are presented in detail. The model is a circular crack growing at constant speed from zero size until it attains a prescribed size. The far-field radiation pattern is the same as that of a simple combination of force doublets, and some qualitative similarities between force doublets and acoustic dipoles are noted. The initial shape of the far-field pulses due to the growing stage and the stopping is determined, but difficulties arise in accounting for the diffraction of a surface wave on the crack faces generated by the stopping of the crack.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567088
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  • 6
    Electronic Resource
    Electronic Resource
    Elastic wave emission from damage processes (1980)
    Springer
    Journal of nondestructive evaluation 1 (1980), S. 215-224 
    Details
    ISSN: 1573-4862
    Keywords: Acoustic emission ; slip ; microcracking ; deformations ; displacement field ; elastic waves ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract The theory of elastic wave emission (i.e., acoustic emission; AE) from damage processes such as slip and microcracking is discussed. Analogous developments in the literature on earth-quake seismology and dynamic dislocation theory are noted and utilized. A general representation of the displacement field of an AE event is given in terms of the double-couple response to a distribution of “moment density tensor” in the source region. Results are specialized to a point source model and to a general far-field analysis of outgoing elastic waves, and conditions for validity of such representations and their low-frequency specializations are noted. Emitted wave fields are compared for tensile opening and slip events, and procedures which might enable the approximate determination of the size or area increase of tensile microcracks are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00571803
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