Manufacturing Industry
Method developed to speed testing of slow crack growth.(Testing/Analysis)
Advanced Materials & Processes, April, 2004
An accelerated testing method for measuring the slow crack growth behavior of brittle materials such as ceramics has been reported at NASA Glenn Research Center, Cleveland, Ohio. The method is based on dynamic fatigue testing, in which a load or a displacement is applied to a specimen at a constant rate.
Life-prediction parameters needed for designing components made of the same material as that of the specimens are calculated from the relationship between the strength of the materials as measured in the test, and the stress rate applied during the test. However, up to now, dynamic fatigue testing has been extremely slow. The new method reduces the time needed by preloading. Although this alters the results of the test, it is possible to account for the...
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