RAPID ULTRASONIC DUAL-WAVE CALIBRATED DETECTION METHOD FOR AXIAL FORCE OF HIGH STRENGTH BOLT
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United States of America Patent
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Issued Date -
Jul 13, 2023
app pub date -
Sep 30, 2020
filing date -
Aug 25, 2020
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Abstract
A rapid ultrasonic dual-wave calibrated detection method includes: numbering a plurality of high strength bolts; searching, in a database in equipment, a calibrated empirical value R0e of initial ratios R0 of ultrasonic transverse wave transit time to ultrasonic longitudinal wave transit time for bolts with entirely or partially same specification data, or a calibrated empirical value ke of a slope k of variation of a bolt tension with a ratio of transverse wave transit time to longitudinal wave transit time; measuring ratios Ri of the ultrasonic transverse wave transit time to the longitudinal wave transit time for the plurality of high strength bolts; acquiring a pretightening axial force value, and using the pretightening axial force value in place of an average value of tensions of the plurality of high strength bolts, calculating calibrated another parameter ke or R0e; and calculating axial forces of the high strength bolts.
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