SYMPOSIA PAPER Published: 01 January 1991

Evaluation of Fatigue Crack Growth Rate of Carburized Gear by Acoustic Emission Technique


Acoustic emission measurements of carburized steel were carried out in room-temperature fatigue tests at the constant load-amplitude condition, in order to evaluate the crack growth behavior. An extremely large number of acoustic emission events were recorded near the maximum load in a flexural fatigue cycle. The increasing behavior of acoustic emission event counts was associated with the distribution of fractured intergranular facets in the fracture surface. Many emissions were also recorded in the spur gear tests. The crack growth rate of the gears can be estimated using the relation between the acoustic emission event counts and the intergranular fracture area on the crack surface. It can be concluded that the acoustic emission technique was powerful and quantitative method to evaluate the fatigue crack behavior of carburized mechanical parts.

Author Information

Obata, Y
Kobayashi, H
Aoki, K
Yamaguchi, T
Shibata, K
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Developed by Committee: E07
Pages: 261–270
DOI: 10.1520/STP19099S
ISBN-EB: 978-0-8031-5160-4
ISBN-13: 978-0-8031-1389-3