| Project/Area Number |
62550076
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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 | Tottori University |
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Principal Investigator |
KISHI Takeyasu Assosiate Professor, Faculty of Engineering, Tottori University, 工学部, 助教授 (50032032)
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| Co-Investigator(Kenkyū-buntansha) |
KISHI Yoko Research Assistant, Faculty of Engineering, Tottori University, 工学部, 教務職員 (60153079)
KAWAGOE Haruo Professor, Faculty of Engineering, Tottori University, 工学部, 教授 (60032009)
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| Project Period (FY) |
1987 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1988: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1987: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Photoelasticity / Stress freezing / Epoxy resin / Creep / Figure of merit / Proportional limit / Freezing temperature / Creep recovery / Stress freezing cycle / 熱応力 / 転移領域 / ポアソン比 / 光弾性応力凍結法 / 線形性 |
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| Research Abstract |
In this investigation, we deals with a fundamental study on the improvement of the conventional stress freezing method. Uniaxial tensile creep tests are carried out at several temperatures to study the optical and mechanical properties of the epoxy resins, which have different proportions of the curing agent, and to examine the stress-fringe order and stress-strain relations of the materials at temperatures in the transition zone and the glassy state. Variations of the photoelastic sensitivity and the figure of merit with temperature and time are presented and compared with respect to the proportion of the curing agent. In addition, the linearity of the stress-fringe order and that of the stress-strain are discussed, and the proportional limits are presented.
Further, the photoelastic fringe response and the mechanical behavior of the materials during cooling and after unloading at rome temperature are observed and recorded in the stress-freezing tests with the two-dimensional specimens under various conditions. It is shown that the freezing temperature and the duration time have significant influence on the frozen-in response whereas the cooling rate does not much affect it. and also, it is shown that the stress in frozen even if the duration of loading at freezing at temperature in the glassy state is comparatively short.
Further, the circular shafts with U-shaped grove under tension are used in the stress freezing and the frozen-in fringe patterns for different freezing temperatures are compared. In addition, the temperature distribution of the solid cylinder during freezing process is presented and the thermal stress is discussed.
The results obtained are useful for saving the time required to conduct a stress freezing for a thicker model and for planning the stress freezing cycle.
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