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Abstract:
Since analytical crack growth laws and a general physical interpretation of mechanisms are not well established for fatigue crack propagation at near-threshold levels, experimental measurements of crack growth rates are the principle means of characterizing behaviour in this regime. Unfortunately, long testing times, with associated high energy and man-power costs, are involved when conventional fatigue testing machines are used. In the present paper, the use of ultrasonic fatigue testing is described as a rapid test method to determine threshold stress intensity values and to monitor near-threshold growth rates down to 4 x 10-11 mm/cycle. The technique, which utilizes 21 kHz frequencies, is shown to be useful for testing in corrosive and non-corrosive environments at temperatures from approximately 4K to high temperatures.
| Pages: |
13 |
| Report Date: |
1982 |
| Report Number: |
D661854 |
Report Unavailable |
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