Creep fatigue test of thermal stress mitigation structure model (2) under thermal transient loadings, 3; Thermo-elastic analysis on the structural discontinuity portions

Kasahara, Naoto; Watashi, Katsumi; Iwata, Koji

In order to clayify problems in elastic analyses of structures and to get fundamental data to develop evaluation methods of inelastic behaviors, we have carried out transient heat transfer analysis and thermo-elastic analysis on the Stress Mitigation Structure Model (2)tested by Thermal Transient Test Facility for Structures(TTS). Adopted Code is a universal non-linear structural analysis code FINAS. In the case of thermal transient structural analysis, points to which special attention should be paid are modeling of structures and thermal boundaries. Considering the former point, calculated results by part models were examined though comparing with a entire model. For the later one, influences of thermal boundaries on thermal stress were investigated. These analysis results were input to structural strength data base with the destructive inspection results to be compared with ones of other test models. Following results were obtained through this analytical study. (1)It was clarified that influences of boundary conditions were different between a entire analysis model and part models. (2)Heat convective conditions on the surfaces in open air spaces can not be ignored and should be considered. (3)Failure mode of an upper skirt was quite different from one of a plate to cylinder junction in spite of a small difference of elastical calculated damage. (4)It was found that there is such unexpected failure mode of a perforated plate as penetration clacks between holes. (5)Blastic analysis data of the Stress Mitigation Structure Model(2) was obtained for a structural strength database.