SUS304切欠き試験片の高温における裂発生寿命

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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 atainless 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 photografhs. 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 initiatted 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 abtained by smooth specimens shows that it is possible to predict conservatively the macro crack initiation life of stress-strain concentration parts.
社団法人日本材料学会の論文
1992-01-15

SUS304切欠き試験片の高温における裂発生寿命

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