Non destructive testing for creep damage of a ferromagnetic...

Details Non destructive testing for creep damage of a ferromagnetic... Non destructive testing for creep damage of a ferromagnetic...

G - Physics

01

R

324/52.1

G01R 33/12 (2006.01) G01N 27/90 (2006.01)

Patent

CA 1278603

Abstract of the Disclosure Rapid nondestructive testing of a ferromagnetic workpiece for creep damage is carried out by placing an eddy current coil adjacent to the workpiece, passing an alternating current through the coil, measuring the eddy current response as influenced by the workpiece, and comparing the current measurement to a current calibrated to known creep damage for the given ferromagnetic material. Correlations of the eddy current response to creep rate and time to failure are generated from creep rupture tests performed on specimens of the given material subjected to varying conditions of time, temperature and stress. Qualitative tests can also be performed to identify the point of greatest creep damage by passing the eddy current coil over the workpiece to find the location of the lowest eddy current response. Conventional creep damage tests can then be performed at that location if desired.

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