SEDL / STP / STP1077-EB / STP19099S

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

Obata, Y
research assistant, graduate student and professorresearcher and senior researcher, College of Industrial Technology, Nihon UniversityCentral Engineering Laboratories, Nissan Motor Co., Ltd., Narashino, ChibaYokohama, Kanagawa,

Kobayashi, H
research assistant, graduate student and professorresearcher and senior researcher, College of Industrial Technology, Nihon UniversityCentral Engineering Laboratories, Nissan Motor Co., Ltd., Narashino, ChibaYokohama, Kanagawa,

Aoki, K
research assistant, graduate student and professorresearcher and senior researcher, College of Industrial Technology, Nihon UniversityCentral Engineering Laboratories, Nissan Motor Co., Ltd., Narashino, ChibaYokohama, Kanagawa,

Yamaguchi, T
research assistant, graduate student and professorresearcher and senior researcher, College of Industrial Technology, Nihon UniversityCentral Engineering Laboratories, Nissan Motor Co., Ltd., Narashino, ChibaYokohama, Kanagawa,

Shibata, K
research assistant, graduate student and professorresearcher and senior researcher, College of Industrial Technology, Nihon UniversityCentral Engineering Laboratories, Nissan Motor Co., Ltd., Narashino, ChibaYokohama, Kanagawa,

Pages: 10    Published: Jan 1991

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Source: STP1077-EB

Abstract

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.

Keywords:
carburized steel, spur gear, acoustic emission, fatigue crack growth, crack detection, intergranular fracture

Paper ID: STP19099S
Committee/Subcommittee: E07.04
DOI: 10.1520/STP19099S
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