材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
SUS304切欠き試験片の高温におけるき裂発生寿命
高橋 浩之川上 崇宇野 哲老高倉 賢一渡士 克己金沢 誠一
著者情報
ジャーナル フリー

1992 年 41 巻 460 号 p. 68-73

詳細
抄録

In order to rationalize the creep-fatigue damage tolerant design of a fast breeder reactor (FBR), it is very important to determine the relationship between the creep-fatigue damage of components having stress concentration and the creep-fatigue life obtained by smooth specimens.
In the present study, creep-fatigue tests were carried out on 304 stainless steel notched specimens, simulating the case of FBR component. The bending load was applied at 600°C under a condition of local strain control. During the tests, the damage progress in the notch bottom, from crack initiation through propagation, was continuously recorded on microscope photographs. The stress-strain behavior obtained by inelastic analysis was compared with the test results. The creep-fatigue damage value for the crack initiation was calculated by using the linear damage rule. The main conclusions are as follows.
(1) Micro-cracks initiated in an early stage. A sufficient life, however, remained until macro crack initiation.
(2) As the creep influence became significant, damage occurred over an extensive region.
(3) The stress-strain behavior in actual components was estimated accurately with inelastic analysis, based on the constitutive equations derived from smooth specimen tests.
(4) Estimation according to the linear damage rule with creep and fatigue failure data obtained by smooth specimens shows that it is possible to predict conservatively the macro crack initiation life of stress-strain concentration parts.

著者関連情報
© 日本材料学会
前の記事 次の記事
feedback
Top