Thema: Ultraschall-Doppelbrechung, Temperatureinfluá
Autor/Institution: Fujii, I.;Kawashima, K.;Ito, T.;Sugiyama, Y.
/Nagoya Inst. of Tech., J
Title: Measurement of temperature-dependece of acoustoelastic birefringence with
digital zero-crossing method
Titel : Messung der Temperaturabhängigkeit der akustoelastischen Doppelbrechung
mit der digitalen Nulldurchgangsmethode
Quelle : Nondestructive Testing and Stress-Strain Measurement, FENDT '92. Vol. 1.
Nondestructive Testing. Proceedings of International Symposium, Tokyo, J,
October 12-14, 1992
1992
; Tokyo: JSNDI
; ISBN 4-931018-02-5
; S.319-324
; 6S,6B,6Q
; BAM-Z-1337/94
; E
Abstract:
A simple and accurate method to measure the transit time of ultrasonic
waves has been developed with a high-speed digital wave memory and a
personal computer. The zero-crossing method is applied for the first and
second echoes reflected from the back-wall of a specimen. The maximum
error of this method is estimated to be 0.1 ns. The couplant, which is
used for propagating ultrasonic wave between a transducer and a specimen,
affects the accuracy in measurement. Thus the thickness of the couplant is
kept constant and the couplant is sealed with a clay. The error due to the
couplant is reduced. The error due to replacement of the transducer is
less than 1 ns. With this method, the temperature-dependence of the
transit time of ultrasonic transverse wave and acoustoelastic
birefringence of aluminum alloy 2017-T3 rolled plate were measured for
temperature range 10 - 30 deg C. The transit time was measured with
applying uniaxial tensile stress under constant temperature. The
temperature of specimen was controlled in a water bath. The relative
change in the transverse wave velocity is found to be 3.0 x 10(exp -4)/deg
C, irrespective of specimens, polarized directions, and stresses. A change
in acoustoelastic birefringent coefficients due to temperature is not
found for this material. F33,B13
Database Keywords: Zerstörungsfreie Prüfung, Akustisches Messen,
Schallgeschwindigkeitsmessung, :Laufzeitmessung, Digitalsystem,
Impulsechoverfahren, Meßgenauigkeit, Kopplungsmittel, Ankopplung,
:Temperatureinfluß, Transversalwelle, Aluminiumlegierung, Zugversuch,
Mechanische Spannung, Zugspannung
23 :Ultraschall Doppelbrechung
24 Z:D
26 2017-T3
File Producer: FWD Förderverein Werkstoffdokumentation e.V. (DGZfP, BAM, FIZ Technik)
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