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Kawasaki, Nobuchika; Date, Shingo*; Kikuchi, Koichi*; Isobe, Nobuhiro*; Kasahara, Naoto
Nihon Kikai Gakkai M&M 2009 Zairyo Rikigaku Kanfarensu Koen Rombunshu (CD-ROM), p.535 - 536, 2009/07
The effect of ratcheting strain on creep-fatigue strength was investigated in order to adjust the strain limit. Ratcheting creep-fatigue tests were conducted at 600 
C with 1 hr hold time. Creep fatigue lives did not decrease when the accumulated strain was superimposed within 5%. Therefore the effect of ratcheting on creep-fatigue strength is negligible when accumulated strain exceeds 2%.
Okajima, Satoshi; Date, Shingo*; Kawasaki, Nobuchika; Kikuchi, Koichi*; Isobe, Nobuhiro*; Kasahara, Naoto
Nihon Kikai Gakkai M&M 2009 Zairyo Rikigaku Kanfarensu Koen Rombunshu (CD-ROM), p.537 - 538, 2009/07
no abstracts in English
Iwata, Koji
Nihon Kikai Gakkai M&M 2009 Zairyo Rikigaku Kanfarensu Koen Rombunshu (CD-ROM), p.138 - 140, 2009/07
A two-surface cyclic plasticity model which enables precise prediction of inelastic behaviors of cyclically loaded metallic materials under non-isothermal conditions is presented. A concept of generic stress-strain relation, which is generated from monotonic and cyclic stable stress-strain curves, is introduced in the model to represent cyclic hardening. Temperature dependent material properties are taken into account in the rate form constitutive equation. The functional capability of the model is verified through its application to basic uniaxial material tests with/without varying temperature.
Shibata, Taiju; Sumita, Junya; Makita, Taiyo*; Takagi, Takashi*; Kunimoto, Eiji; Sawa, Kazuhiro; Park, Y.*; Kim, W. J.*; Jung, C. H.*
no journal, ,
no abstracts in English
Kiriyama, Koji; Shobu, Takahisa; Shibano, Junichi*; Kaneko, Hiroshi
no journal, ,
Duplex stainless steels are estimated to show complicated strain behavior when tensile loading because of a micro texture mixed 
-Fe and 
-Fe. In this study, to understand micro strain behavior of duplex stainless steels, inner strain of SUS329J1 have been measured under tensile loading using synchrotron white X-ray at SPring-8. Results showed that many lattice strains decreased at an applied strain, 0.0016e, and oscillated as applied strains increased. These suggested that local plastic deformation caused by slipping at some planes, for example 
of -Fe 
of -Fe, occurred in the specimen although the range of loaded stress is under elastic deformation.
Suzuki, Hiroshi; Katsuyama, Jinya; Morii, Yukio
no journal, ,
In this study, residual stress distributions in transverse path in the center of wall thickness of 35 mm thick butt weld were measured using neutron diffraction technique. Measurement condition such as suitable diffraction planes and stress-free lattice constant was optimized using standard sample. It was confirmed that influence of intergranular strain was negligible on the 311 in austenitic steel and on the 211 reflections in ferritic steel. Trend of residual stress distributions of SUS304 butt weld and SUS304-low alloy steel (A533B) dissimilar butt weld was different near the weldment since the dissimilar weld was affected by the misfit of thermal expansion coefficient between austenitic steel and ferritic steel.