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Oral presentation

A Proposal of a conversion method between small punch creep properties and uniaxial ones of Mod.9Cr-1Mo steel at the operating temperature of fast reactors

Yamashita, Hayato; Onizawa, Takashi; Takaya, Shigeru; Enuma, Yasuhiro; Wakai, Takashi; Kato, Shoichi; Suzuki, Akihiro*

no journal, , 

This study proposes an appropriate method to convert the load parameter in small punch creep (SPC) tests to that in uniaxial creep tests for Mod.9Cr-1Mo steel at operating temperature of future fast reactors. It is impossible to simply compare the results of SPC tests to those of uniaxial creep tests, because the load parameters in those creep tests are load and stress, respectively. Conventionally, load/stress conversion coefficient (F/$$sigma$$) has been employed to compare the results of SPC and uniaxial creep tests. Though the applicability of F/$$sigma$$ has been demonstrated in the temperature region considerably higher than 550$$^{circ}$$C that is the operating temperature of future fast reactors, the applicability has not been demonstrated at 550$$^{circ}$$C. Therefore, this paper studies an appropriate method to obtain F/$$sigma$$. F/$$sigma$$ calculated from finite element analysis (FEA) and that based on fracture ductility was too small to convert SPC results. In contrast, it was clarified that conversion was possible using F/$$sigma$$ based on Arrhenius-type equation.

Oral presentation

Consideration of strength difference between welded joint and base metal in Mod. 9Cr-1Mo steel for high temperature structural design

Yamamoto, Kenji*; Yamashita, Hayato; Onizawa, Takashi

no journal, , 

Oral presentation

Study on the effect of initial imperfection shape on buckling strength of cylindrical vessel under the horizontal and vertical loads

Okafuji, Takashi*; Miura, Kazuhiro*; Sago, Hiromi*; Murakami, Hisatomo*; Ando, Masanori; Miyazaki, Masashi

no journal, , 

Buckling evaluation methods capable of evaluating elasto-plastic buckling under axial compression, bending, and shear loads are required for cylindrical vessels of fast reactors to cope with thinning due to increasing diameter and application to the seismic isolation design against huge seismic ground motion. In this study, the effect of initial imperfection and stress of large vessels manufactured by welding multiple plates on the buckling load was evaluated via a series of analyses. In these analyses, the superimposition of global imperfection over the entire vessel due to accumulation of misalignment in buckling mode imperfection had minimal effect on the buckling load. Accordingly, the length for measuring the imperfection amplitude should correspond to the wavelength of the buckling mode. The local imperfection and residual stress by welding also exerted small effects on the buckling load.

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