Measuring and testing – Vibration – By mechanical waves
Patent
1990-09-04
1993-01-05
Arana, Louis
Measuring and testing
Vibration
By mechanical waves
73598, 73644, G01N 924
Patent
active
051760339
ABSTRACT:
A non-destructive method for determining the presence of anisotropic structures in the interior of an as-formed metal. The method includes the steps of (a) attaching an ultrasonic transducer to the metal item prior to working the metal; (b) energizing the transducer to generate shear ultrasonic waves capable of penetrating the metal item; (c) measuring the time of flight of the shear ultrasonic waves through the metal item; (d) rotating the transducer approximately 90.degree.; (e) repeating step (c); and determining the difference between steps (c) and (e) to determine the presence of anisotropic structures in the interior of the metal item.
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patent: 4033182 (1977-07-01), Clotfelter
patent: 4080836 (1978-03-01), Thompson et al.
patent: 4790188 (1988-12-01), Bussiere et al.
Yamaguchi et al., "Effects of Solute Content and Heat Treatment on Elastic Coefficients of Al-Cu Alloys Containing Columnar Crystals", Zairyoshi, vol. 32, No. 352, pp. 94-100.
"Stress-Induced Anisotropy in Solids the Acousto-Elastic Effect", by R. T. Smith Ultrasonics/Jul.-Sep. 1963, pp. 135-147.
Granger Douglas A.
Jones Martin P.
Aluminum Company of America
Arana Louis
Pearce-Smith David W.
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