TF41 Engine Fan Disk Seeded Fault Crack Propagation Test
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH GLENN RESEARCH CENTER
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A cooperative program was conducted between the FAA, U.S. Navy, NASA, and the U.S. Air Force to evaluate crack detection techniques in a seeded fault engine test. The first stage fan of a TF41 engine with a seeded fault was run in a full scale engine test facility. Various disk crack detection systems were installed on the disk and monitored real time. Post-engine-test cycles were accumulated on the TF41 disk in a spin pit to further measure crack growth and disk strain. The crack in the TF41 first stage fan disk grew during the engine test, but significantly less than that predicted from fracture mechanics analysis. Techniques to detect disk crack using center of mass shift seemed feasible in the engine test environment, Techniques to detect disk crack using blade deflections was not effective in this test due to blade wander.
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