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Acoustic Emissions at an Open Crack

  • John A. Johnson

Abstract

Both finite difference and finite element techniques have been shown to be capable of modeling the propagation of acoustic emissions (AE) [1,2]. However, those calculations could also be done using the simpler Green’s function methods [3]. In this work the finite element method is used to model a problem that includes complexities that cannot be handled using the Green’s function methods.

Keywords

Longitudinal Wave Surface Wave Acoustic Emission Displacement Field Acoustic Emission Signal 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    J. A. Johnson, “Numerical Calculations of Acoustic Emission Signals,” submitted to J. Acous. Soc. Am. Google Scholar
  2. 2.
    J. A. Johnson, “Numerical Calculations of Acoustic Emission Signals,” Proceedings of the Review of Progress in QNDE 6, edited by D. O. Thompson and D. E. Chimenti (Plenum Press, New York, 1987).Google Scholar
  3. 3.
    N. N. Hsu, “Dynamic Green’s Functions of an Infinite Plate — A Computer Program,” National Bureau of Standards Report NBSIR 85–3234, August 1985.Google Scholar
  4. 4.
    J. O. Halquist, “User’s Manual for DYNA2D — An Explicit Two-Dimensional Hydrodynamic Finite Element Code with Interactive Rezoning,” Lawrence Livermore Laboratory Report UCID-18756 (Rev. 2), (1984).Google Scholar
  5. 5.
    B. A. Barna, J. A. Johnson, and R. T. Allemeier, “Determination of Crack Initiation Sites Using a Digital Acquisition Workstation,” to be published in Experimental Mechanics.Google Scholar
  6. 6.
    R. B. Thompson and C. J. Fiedler, “The Effects of Crack Closure on Ultrasonic Scattering Measurements,” Review of Progress in QNDE 3, edited by D. O. Thompson and D. E. Chimenti (Plenum Press, New York, 1984), pp. 207–215.Google Scholar
  7. 7.
    M. Punjani and L. J. Bond, “Scattering of Plane Waves by a Partially Closed Crack,” Proceeding of the Review of Progress in QNDE 5, edited by D. O.Thompson and D. E. Chimenti (Plenum Press, New York, 1986), pp. 61–71.Google Scholar

Copyright information

© Plenum Press, New York 1988

Authors and Affiliations

  • John A. Johnson
    • 1
  1. 1.Idaho National Engineering LaboratoryEG&G Idaho, Inc.Idaho FallsUSA

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