Method and apparatus for predicting fatigue by introducing a continuous excitation to determine damping factor
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United States of America Patent
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Mar 25, 1997
Issued Date -
N/A
app pub date -
Jun 7, 1995
filing date -
Mar 3, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The fatigue integrity of metallic materials may be determined by either one of two methods. In a first method, an impulse of energy is introduced into the material, such as by striking the material (20), and the induced vibration is sensed and analyzed in order to compute the damping factor thereof, the damping factor being directly related to the fatigue thereof. With this method, a transducer (28) is coupled to the material and its output is amplified by an amplifier (30) before input to a computer (32) which determines the damping factor. In a second method, a continuous energy input is provided to the material, such as by utilizing a frequency generator coupled to a power amplifier whose output drives a transducer such as a speaker or the like for inducing a continuous vibration in the metallic material. This continuous vibration is measured with a transducer, an amplifier, and a damping factor calculated with a computer as in the first method.
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