Accession Number:

ADA123277

Title:

A Boundary Integral Method for Eddy Current Flow Around Cracks in Thin Plates.

Descriptive Note:

Topical rept. for period ending Aug 81,

Corporate Author:

CORNELL UNIV ITHACA NY

Personal Author(s):

Report Date:

1981-09-01

Pagination or Media Count:

9.0

Abstract:

A boundary element method which employs a Greens function for a crack has been developed to calculate the induced eddy current flow around cracks in thin conducting plates. The theoretical equations employ a stream function for the current density vector and is equivalent to the electric field vector potential method. A low frequency or large skin depth approximation leads to a Poisson equation for steady harmonic inductor fields. Induced currents around a crack in a square plate due to a uniform inductor field for various crack positions and sites have been calculated in this paper. The effect of the relative position and length of the crack, with respect to the plate width, on the eddy current density near the tips of the crack is given special attention. These results may be useful to simulate eddy current flow detection phenomena. Author

Subject Categories:

  • Numerical Mathematics
  • Test Facilities, Equipment and Methods
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE