Initiation and propagation life distributions of fatigue cracks and the life evaluation in high cycle fatigue of ADI

Yasuo Ochi; Tomohisa Ogata; Masanobu Kubota; Akira Ishii

doi:10.2472/jsms.46.1155

Initiation and propagation life distributions of fatigue cracks and the life evaluation in high cycle fatigue of ADI

Yasuo Ochi, Tomohisa Ogata, Masanobu Kubota, Akira Ishii

Hydrogen Materials Compatibility Division

Research output: Contribution to journal › Article

1 Citation (Scopus)

Abstract

Rotating bending fatigue tests were carried out on austempered ductile cast iron (ADI) in order to investigate the statistical properties of life distributions of crack initiation and propagation, and also the evaluation of fatigue life. The results are summarized as follows: (1) The size of crack initiation sites of the material was represented by a Weibull distribution without regarding to the kinds of crack initiation sites such as microshrinkage and graphite grain. The crack initiation life scattered widely, but the scatter became much smaller as soon as the cracks grew. (2) The crack propagation life N_ac which was defined as the minimum crack propagation rate showed lower scatter than the crack initation life. (3) The fatigue life of the material was evaluated well by N_ac and the propagation rate after N_ac. It was clear that the fatigue life of ductile cast iron was goverened by the scatter of N_ac.

Original language	English
Pages (from-to)	1155-1160
Number of pages	6
Journal	Zairyo/Journal of the Society of Materials Science, Japan
Volume	46
Issue number	10
DOIs	https://doi.org/10.2472/jsms.46.1155
Publication status	Published - Jan 1 1997

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All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Cite this

Ochi, Y., Ogata, T., Kubota, M., & Ishii, A. (1997). Initiation and propagation life distributions of fatigue cracks and the life evaluation in high cycle fatigue of ADI. Zairyo/Journal of the Society of Materials Science, Japan, 46(10), 1155-1160. https://doi.org/10.2472/jsms.46.1155

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abstract = "Rotating bending fatigue tests were carried out on austempered ductile cast iron (ADI) in order to investigate the statistical properties of life distributions of crack initiation and propagation, and also the evaluation of fatigue life. The results are summarized as follows: (1) The size of crack initiation sites of the material was represented by a Weibull distribution without regarding to the kinds of crack initiation sites such as microshrinkage and graphite grain. The crack initiation life scattered widely, but the scatter became much smaller as soon as the cracks grew. (2) The crack propagation life Nac which was defined as the minimum crack propagation rate showed lower scatter than the crack initation life. (3) The fatigue life of the material was evaluated well by Nac and the propagation rate after Nac. It was clear that the fatigue life of ductile cast iron was goverened by the scatter of Nac.",

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10.2472/jsms.46.1155