| Project/Area Number |
09650089
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | TOKYO INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
IKEGAMI Kozo Professor, Precision and Intelligence Laboratory, TOKYO INSTITUTE OF TECHNOLOGY, 精密工学研究所, 教授 (40016788)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Chiaki Associate Professor, Precision and Intelligence Laboratory, TOKYO INSTITUTE OF T, 精密工学研究所, 助教授 (80235366)
HORIE Mikio Associate Professor, Precision and Intelligence Laboratory, TOKYO INSTITUTE OF T, 精密工学研究所, 助教授 (00126327)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 1998: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1997: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Plasticity / Low temperature / Liquid nitrogen / Material testing / Cyclic deformation / Prestrain / Stainless steel / ステンレス鋼 |
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| Research Abstract |
Constitutive relations of cyclic loading are experimentally investigated by subjecting thin walled tubular specimens to axial load and torsional load at 77K in liquid nitrogen. The. material of specimen is stainless steel SUS304. The effects of the direction and the temperature of giving prestrain are examined by using stress-strain curves of cyclic loading.
The effects of prestraining direction on cyclic stress-strain curves are as follows.
(1) The prestrain transverse to cyclic loading gives, rise to large plastic hardening at the initial stage of cyclic loading. With increase of cyclic loading, the plastic hardening decreases gradually and approaches to the behavior of cyclic loading without prestrain.
(2) The prestrain of cyclic loading direction produces the plastic hardening similar to accumulated plastic strain of cyclic loading.
The effects of prestraining temperature on cyclic stress-strain curves are as follows.
(1) The prestrain transverse to cyclic loading at 77K gives rise to larger plastic hardening than the prestrain at room temperature. With increase of cyclic loading the effect of prestraining temperature decreases.
(2) The prestrain of cyclic loading direction results in similar plastic hardening at room temperature and 77K.The effects of prestraining temperature is not remarkable.
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