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Shingo Date

Bio: Shingo Date is an academic researcher from Mitsubishi Heavy Industries. The author has contributed to research in topics: Creep & Deformation (engineering). The author has an hindex of 6, co-authored 21 publications receiving 150 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, a series of fatigue and creep-fatigue tests coupled with strain progress were carried out for 316FR stainless steel, and it was found that tensile ratcheting decreases the failure life to a large extent at small strain range.

36 citations

01 Jan 2005
TL;DR: In this article, experimental and analytical studies have been conducted on high-temperature crack growth properties of representative high-chromium steels, and the effect of constraint on creep crack growth behavior was found to be quite large.
Abstract: High-chromium steels are widely used in recent fossil power plants because of their excellent high-temperature strength. They are also regarded as promising candidates for structural materials for high-temperature nuclear power plants such as liquid metal-cooled fast reactors and high-temperature gas-cooled reactors. Their crack growth property is often required to evaluate the structural integrity under the presence of detected or postulated flaws. In addition to fatigue crack growth property, crack growth property under creep and creep-fatigue loading is important because of high operating temperatures of these plants. As a study in the working group organized in Japan Society of Materials Science, experimental and analytical studies have been conducted on high-temperature crack growth property of representative high-chromium steels. Researchers from plant manufacturers, utilities and universities participated to this activity. Temperatureand specimen -dependency of crack growth properties in terms of J-integral type fracture mechanics parameters were examined in detail. Standard equations were derived to estimate crack growth rate as a functions of these parameters. Effect of constraint on creep crack growth behavior was found to be quite large.

31 citations

Journal ArticleDOI
TL;DR: In this article, the effect of ratcheting on fatigue strength was investigated in order to rationalize the strain limit as a design criterion of commercialized fast reactor systems, and the authors found that fatigue life reduction was negligible when the maximum mean stress was less than 25 MPa, corresponding to an accumulated strain of 2.2%.

23 citations

Journal ArticleDOI
TL;DR: In this article, the authors used the creep curve, rupture life and ductility of the miniature specimens tested in argon were similar to those of conventional sized specimens in air, and the fracture mode of the miniaturized specimens was also consistent with that of conventional-sized specimens.
Abstract: In order to validate a procedure for creep rupture tests using miniature specimens, a sampling technique and a method of making the miniature specimens were investigated. Finally, the use of the iso-stress creep rupture test on the miniature specimens to predict the remaining creep life of Cr-Mo-V, 21/4Cr-Mo and 11/4-1/2Mo steel was examined.The creep curve, rupture life and ductility of the miniature specimens tested in argon were similar to those of conventional sized specimens in air. The fracture mode of the miniature specimens was also consistent with that of conventional sized specimens.On a graph showing temperature T vs. log time to rupture tr, the creep rupture data were represented with an iso-stress line, respectively. Each iso-stress line shifted parallel with the stress level.Moreover, the sampling device that was developed was applied to the operating plant components. Samples have been successfully removed from it and were obtained without affecting the material properties around the core hole.

11 citations


Cited by
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Journal ArticleDOI
TL;DR: A probabilistic framework for fatigue life prediction and reliability assessment of an engine high pressure turbine disc is proposed to incorporate the effects of load variations and mean stress, which provides a reference for engine structural design under a given target failure probability.
Abstract: In the present work, a probabilistic framework for fatigue life prediction and reliability assessment of an engine high pressure turbine disc is proposed to incorporate the effects of load variatio...

140 citations

Journal ArticleDOI
TL;DR: In this paper, a series of creep-fatigue tests for three types of high-chromium steels used in fossil power plants and the applicability of life prediction methods has been studied.

107 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of constraint induced by the crack depth on creep crack-tip stress field in compact tension (CT) specimens is examined by finite element analysis, and the effects of creep deformation and damage on the Hutchinson-Rice-Rosengren (HRR) singularity stress field are discussed.

98 citations

Journal ArticleDOI
TL;DR: In this paper, the effect and mechanism of out-of-plane constraint on creep crack growth rates were experimentally investigated, and the results showed that the outofplane constraint effect on creep cracks is related to C∗-integral levels.

79 citations