Measuring and testing – Vibration – Resonance – frequency – or amplitude study
Patent
1995-04-10
1995-11-21
Williams, Hezron E.
Measuring and testing
Vibration
Resonance, frequency, or amplitude study
73630, 73643, G01N 2912, G01H 1104, G01H 1300
Patent
active
054676550
ABSTRACT:
A method for measuring properties of a cold rolled thin steel sheet, comprising the determination, by using a resonant electromagnetic ultrasonic wave sensor for a standing wave, of the ratio of a thickness resonant frequency of a transverse ultrasonic wave propagating within a cold rolled thin steel sheet in the direction of thickness while polarized in a direction parallel to the direction of rolling to a thickness resonant frequency of a longitudinal ultrasonic wave propagating within the cold rolled thin steel sheet in the direction of thickness, and the ratio of a resonant frequency of a transverse ultrasonic wave propagating within the cold rolled thin steel sheet in the direction of thickness while polarized in a direction normal to the direction of rolling to a thickness resonant frequency of a longitudinal ultrasonic wave propagating in the direction of thickness, and approximately determining the Young's modulus and the Lankford value according to a computing formula using the resultant two measured -ratio values, the sound speed ratio of a SH0 plate wave regarded as a constant value and a known value of modulus of elasticity; and an apparatus for measuring properties of a cold rolled thin steel sheet comprising an electromagnetic ultrasonic wave device, a computing device and a controlling device for executing the measurement of properties and the computation.
REFERENCES:
patent: 3592051 (1971-07-01), Kubo
patent: 4164873 (1979-08-01), Bottcher et al.
patent: 4218924 (1980-08-01), Fortunko et al.
Ultrasonic Testing of Materials by Josef Krautkramer and Herbert Krautkramer, 2nd Edition, (1977) chapter 11 pp. 265-286.
Hyoguchi Takao
Kawashima Katsuhiro
Finley Rose M.
Nippon Steel Corporation
Williams Hezron E.
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