著者

林 眞琴

出版者

日本刑法学会

雑誌

刑法雑誌 (ISSN:00220191)

巻号頁・発行日

vol.46, no.3, pp.367-377, 2007-04-01 (Released:2020-11-05)

著者

林 眞琴

出版者

有斐閣

雑誌

月刊法学教室 (ISSN:03892220)

巻号頁・発行日

no.266, pp.2-3, 2002-11

著者

笠原 直人 林 眞琴

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集A編 (ISSN:18848338)

巻号頁・発行日

vol.78, no.789, pp.583-598, 2012 (Released:2012-05-25)

参考文献数

39

被引用文献数

1

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Various kinds of thermal fatigue failure modes exist in nuclear power plant components. Main causes of thermal loads are structural responses to fluid temperature changes. These phenomena have complex mechanisms and so many patterns, that their problems still occur even though well-known issues. Among them, this paper treats high cycle thermal fatigue of branch pipes as the typical mode. Firstly, experimental and analytical researches are explained for thermal load evaluation. Through them, both numerical and kinematic methods were developed. Next chapter describes thermal fatigue strength studies on both crack initiations and propagations. They revealed the similarities of thermal crack initiations with mechanical ones and frequency characteristics of crack propagation. Finally, current status and future challenges are discussed for evaluation of actual plants.

著者

林 眞琴

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.46, no.4, pp.432-437, 1997-04-15 (Released:2009-06-03)

参考文献数

7

被引用文献数

4 4

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The effect of fluctuating stress on the fatigue strength of type 304 stainless steel in air at 288°C was examined. In any of the 2 step increasing stress, 2 step decreasing stress, repeated 2 step stress (high to low), repeated 2 step stress (low to high) and gradual increasing stress, the cumulative usage factor calculated based on the linear damage law exceeds 1. In the 2 step increasing or decreasing stress, the usage factor for the decreasing stress type is larger than the increasing stress type. On the other hand, the cummulative usage factor for the repeated 2 step stress (low to high) is larger than the repeated 2 step stress (high to law), and the usage factor increases with increasing number of cycles at the first stress. The smaller the difference between the first stress and the second stress, the larger the usage factor. In the gradual increasing stress, the usage factor increases with increasing number of cycles at each stress.