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Yagi, Toshiaki; Morita, Yosuke; Kawakami, Waichiro; *; *; *; *
EIM-90-124, p.65 - 74, 1990/12
no abstracts in English
*
PNC TN9410 90-053, 56 Pages, 1990/02
A series or multiaxial creep-fatigue tests (uniaxial fatigue, pure torsional fatigue, pure torsional creep-fatigue, proportional fatigue, proportional creep-fatigue) was conducted by Toshiba Corporation as a part of a joint study with PNC. The results of the tests were evaluated by the multi-axial creep-fatigue evaluation method which was developed by the authors in the previous report. The following observation were obtained. (1)Results of multiaxial creep-fatigue tests obtained by Toshiba Corporation coincide well with those obtained by PNC, except those of pure torsional fatigue/creep-fatigue tests. In the case of pure torsional fatigue/creep-fatigue, Toshiba data showed slightly longer lives, (2)Pure torsional creep-fatigue lives reduced as the peak strain hold time increased from 3 minites to 60 minites. A longer hold time would have redeced the creep-fatigue lives even more. (3)In pure torsional creep-fatigue tests with a peak strain hold of 15 minuites, recovery of life was not observed with an additional strain hold time (from 3 minites to 15 minuites) at the other strain peak. (4)It was shown that the multiaxial creep-fatigue evaluation method proposed by the authors could cvaluate the Toshiba data conservatively. Life predictionswere conservative for a factor of 5 and nonconservative for a factor of 2.
Tsukimori, Kazuyuki*; Iwata, Koji; *; *
PNC TN9410 88-136, 69 Pages, 1988/08
PNC has proceeded the feasibility study in respect of the bellows expansion joint for FBR pipings because the expansion point is an effective measure to rationaliz evarious piping systems. Essencially bellows should be designed not to be subjected to torsional loads and usually bellows is protected by hardware not to move in the direction of torsion. Actually, however, there are some sources of torsional deformation, e.g. the clearance of bearing structure, the deformation of hardware etc. Therefore it must be available to limit the torsional displacement of bellows clearly in view of improvement of reliability in design and fabrication. The torsional buckling behavior of bellows was investigated with both theory and numerical analysis. The new element, 3-mode axisy㎜etric shell harmonic series element (NAXSHEL3) which was developed in the FINAS fimite element computer progran, was used for the buckling eigen valve analysis. The numerical solutions corresponded to the theory very well in a wide range of dimensions and number of convolutions. Besed on these results the framework of the design rule related to the torsion of bellows was drawn.
Oba, Yojiro*; Adachi, Nozomu*; Todaka, Yoshikazu*; Miura, Hiromi*; Shibayama, Yuki
no journal, ,
no abstracts in English
