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Data Controller System for Fatigue Crack Monitoring Using a Potential Drop Technique.
MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)
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This report describes the design of a control unit to interface with 1 a digital voltmeter calibrated to respond to fatigue crack growth, 2 load and cycle data from a servo hydraulic system, and 3 a desk calculator. The calculator is programmed to determine crack length, crack growth rate and stress intensity factors. Pre-set limits on the load and number of cycles permits termination of the test when the levels have been exceeded. Appropriate power supplies for the units have also been designed and are described. Author
APPROVED FOR PUBLIC RELEASE