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Crack Propagation Studies to Determine Benign Or Catastrophic Failure Modes for Aerospace Thin-rim Gears

David G. Lewicki

出版	National Aeronautics and Space Administration, Lewis Research Center, 1996
URL	http://books.google.com.hk/books?id=eKo3AQAAMAAJ&hl=&source=gbs_api

註釋

Analytical and experimental studies were performed to investigate the effect of rim thickness on gear tooth crack propagation. The goal was to determine whether cracks grew through gear teeth (benign failure mode) or through gear rims (catastrophic failure mode) for various rim thicknesses. The computer program used had an automated crack propagation option in which cracks were grown numerically using an automated re-meshing scheme. In addition, experimental studies were performed in the NASA Lewis Spur Gear Fatigue Rig. Good correlation between the predicted number of crack propagation cycles and measured number of cycles was achieved using both the Paris fatigue crack growth method and the Collipfiest crack growth equation when fatigue crack closure was considered.