Method for tightening a threaded fastener above its yield point
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United States of America Patent
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Nov 13, 2001
Issued Date -
N/A
app pub date -
Aug 10, 2000
filing date -
May 14, 1998
priority date (Note) -
Expired
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Abstract
A method for determining the axial load in a threaded fastener when tightened above its yield point by using the variation in travel time (.DELTA.t) for ultrasonic waves induced in the fastener to determine the axial load (N) in the fastener, both in the yield point and at the final pretension state of the fastener. The yield point of the fastener is detected by indicating a significant change in the growth of the momentary transferred torque per angle unit of rotation, and comparing the actual travel time (.DELTA.t) for ultrasonic waves in the fastener to a pre-tightening determined relationship between the axial load (N), the rotation angle (.PHI.) and the ultrasonic wave travel time (.DELTA.t) for the actual type of fastener.
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