Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1991-04-15
1992-06-09
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
73601, 324226, G01R 3312, G01N 2780, G01N 2900
Patent
active
051210584
ABSTRACT:
A method and apparatus for testing steel components for temperature embrittlement uses magneto-acoustic emission to nondestructively evaluate the component. Acoustic emission signals occur more frequently at higher levels in embrittled components. A pair of electromagnets are used to create magnetic induction in the test component. Magneto-acoustic emission signals may be generated by applying an AC current to the electromagnets. The acoustic emission signals are analyzed to provide a comparison between a component known to be umembrittled and a test component. Magnetic remanence is determined by applying a DC current to the electromagnets, then turning the magnets off and observing the residual magnetic induction.
REFERENCES:
patent: 4363242 (1982-12-01), Heyman
patent: 4497209 (1985-02-01), Kwun et al.
J. S. Heyman; S. G. Allison; and K. Salama. "Influence of Carbon Content on Higher Order Ultrasonic Properties in Steels." Presented at 1988 IEE Ultrasonics Symposium; Oct. 21-Nov. 2, 1983.
S. G. Allison; J. S. Heyman; and L. Salama. "Ultrasonic Measurement of Residual Deformation Stress in Thin Metal Plates Using Surface Acoustics Waves" Presented at the 1983 IEE Ultrasonics symposium, Oct. 31-Nov. 2, 1983.
M, Namkung; D. Utrata; J. S. Heyman; and S. G. Allison. "Low Field Magneto-Acoustic Research Stress Measurement in Steel." Presented at the Solid Mechanics Research for QNDE, Northwestern U., Evanton, IL; Sep. 18-20, 1985.
Allison Sidney G.
Cantrell John H.
Namkung Min
Yost William T.
Administrator, National Aeronautics and Space Administration
Osborne Kevin B.
Strecker Gerard R.
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