Experimental Investigation of the Crack Growth Gage
Final rept. Jan 1978-Nov 1979
AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH
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The objective of this program was to determine the feasibility of the crack growth gage as a more direct method for monitoring potential crack growth damage in fatigue critical areas of F-4 aircraft structure. The major task consisted on mounting crack growth gages on a full-scale F-4CD fatigue test article and collecting crack growth data from the gages at specified intervals. Two additional tasks were comprised of 1 conducting a gage qualification test program in accordance with MIL-STD-810C Environmental Test Method requirements, and 2 determining an appropriate method for collecting data from the gage. Inconsistencies in constant amplitude test results and bonding problems encountered on the F-4CD full-scale fatigue test article prevented the MIL-STD-810C qualification tests from being started. Results of this investigation indicated that further research and development of the crack growth gage concept is required before the gage can be recommended as a fleetwide tracking device.
- Test Facilities, Equipment and Methods