| Project/Area Number |
63550078
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
材料力学
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
IKEGAMI Kozo TOKYO INSTITUTE OF TECHNOLOGY, Res. Lab. of P. M. E., Professor, 精密工業研究所, 教授 (40016788)
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| Co-Investigator(Kenkyū-buntansha) |
NIITSU Yasushi TOKYO INSTITUTE OF TECHNOLOGY, Res. Lab. of P. M. E., Research Associate, 精密工学研究所, 助手 (70143659)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1989: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1988: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | Cryogenics / Plasticity / Stainless Steel / Combined Stress / Temperature Changes / Creep |
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| Research Abstract |
The combined axial and torsional loading tests were carried out for SUS304 stainless steel at low temperature (77K), and temperature changing condition from 293K to 77K. The experimental results were as follows,
1. The flow stress of compressive stress state was greater than that of tensile loading condition at 77K.
2 . When the loading directions were changed from tension to torsion, from torsion to tension or from torsion to compression, remarkable "latent hardening" phenomena were observed. Those hardening values were measured under several loading conditions.
3. Low temperature combined loading tests were conducted subsequent to tensile prestraining at room temperature. Latent hardening and stress difference between tension and compression were appeared,as same as the results at constant temperature.
4. Remarkable visco-plastic behavior was observed in 77K. The creep curves were obtained under several stress levels and loading directions. Larger creep strains were produced in middle stress levels (700 - 850 MPa) than lower or higher stresses.
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