An investigation of the S/N fatigue life gage

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Author
Livingston, Gill Frederick
Date
1968-05Advisor
Murray, W.M.
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The S/N fatigue life gage is a small sensor which is similar in
appearance to a foil strain gage. The S/N fatigue life gage is bonded
to the surface of a mechanical structure using standard strain-gage
techniques. The S/N gage changes resistance permanently as a continuous
function of fatigue experience. This gage was developed by Mr. Darrell
R. Harting of the Boeing Company, Seattle, Washington. The gage is produced
commercially by Micro-Measurements, Inc. and distributed by W.T.
Bean, Inc., Detroit, Michigan. This investigation describes the results of a series of reverse
bending tests on S/N fatigue life gages which were mounted on Ti-6A1-4V
titanium specimens. Each S/N gage was subjected to various constant
strain loadings for varying numbers of cycles. The results of this investigation show that the performance of
the S/N fatigue gage under random cyclic loading is predictable. Another
result of the tests indicates that the S/N gage experiences an above
normal increase in resistance well in advance of actual gage failure.
Finally it was observed that a decrease in S/N gage resistance will
occur: immediately after the mean cyclic strain level is lowered; and
whenever the gage is subjected to any substantial rest period.
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