Fatigue monitoring of 70-30 copper-nickel.
Lash, Franklin Bruce
Brock, John E.
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Recent tests by G. L. Rowe indicated the possibility of monitoring fatigue damage of 70-30 copper-nickel by use of a commercial fatigue life gage. The work reported herein, however, which includes tests at cyclic strain levels considerably higher and lower than those used by Rowe , suggests that much more study and development will be required before in-service monitoring will be useful or reliable. Fatigue failure, using initial surface crack formation as a criterion, takes place at low cyclic strain levels with appreciably smaller gage indication than does failure at medium or high cyclic strain levels. It is further noted that ability to detect surface cracks depends greatly upon the expertise of the observer so that a less subjective criterion of failure should be developed.
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