浸炭歯車の疲労き裂進展に伴うアコースティックエミッション

概要

論文の詳細を見る
The acoustic emission (AE) technique is applied to the analysis of fatigue crack growth in a carburized gear tooth. Marked AEs are detected in the early stage of crack growth and the final stage just before the tooth failure. Through-hardened bend specimens are also tested to determine the AE from carbon steels with different hardnesses, and the AE energy rate is found to be proportional to the stress intensity factor range (ΔK) and crack growth rate. The AE for carburized gears is then simulated from the AE of the bend specimens whose hardness and ΔK are approximately equal to the hardness at the crack tip and ΔK of the gear tooth concerned. The simulation demonstrates higher AE at the early stage and at the final stage of crack growth, and it is characteristic of the measured AE.
1994-07-25