| Project/Area Number |
08455047
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied physics, general
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| Research Institution | KANSAI UNIVERSITY |
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Principal Investigator |
NAKAHARA Sumio KANSAI UNIVERSITY,FACULTY OF ENGINEERING,ASSOCIATE PROFESSOR, 工学部, 助教授 (90067760)
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| Co-Investigator(Kenkyū-buntansha) |
OWAKI Shigehiro UNIVERSITY OF OSAKA PREFECTURE,COLLEGE OF INTEGRATED ARTS AND SCIENCE,PROFESSOR, 総合科学部(平成8年度), 教授 (50029873)
KIMURA Yoshitake KONAN UNIVERSITY,FACULTY OF SCIENCE,PROFESSOR, 理学部(平成9年度,10年度), 教授 (30068085)
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| Project Period (FY) |
1996 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥7,700,000 (Direct Cost: ¥7,700,000)
Fiscal Year 1998: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1997: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1996: ¥5,200,000 (Direct Cost: ¥5,200,000)
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| Keywords | DEFORMATION / FRACTURE / ELECTRON EMISSION / ATOMIC FORCE MICROSCOPY / LOW TEMPERATURES / ELECTRONIC SPECKLE PATTERN INTERFEROMETRY / STRAIN / THERMAL EXPANSION / スペックルパターン干渉法 / 熱,ひずみ / 熱膨張率 / 電子放出 / 新生面 / 真空 / スペックル干渉法 / 熱ひずみ / スペックルパターン / ひずみ / AFM(原子間力顕微鏡) |
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| Research Abstract |
We examined the use of chemisorptive emission (electron emission accompanying the adsorption of a reactive gas on a metal surface) and atomic force microscopy as measures of plastic deformation during fracture along a metallic Mg/glass interface. Localized ductile deformation in the metallic phase enhances the fracture energy, exposes metallic Mg to the reactive O_2 atmosphere, and produces intense emission. The number of electrons emitted following fracture in low-pressure oxygen atmospheres is strongly correlated with the total energy expended during failure (peel energy). The presence of localized ductile deformation is verified by atomic force microscopy (AFM) : voids are observed on surfaces yielding significant emissions and enhanced fracture energies. These voids are not observed on samples yielding the lowest peel energies and emission intensities, i.e., where the contribution of deformation to the peel energy is negligible. The potential for chemisorptive electron emission (CS
… More
E) as a probe of deformation along interfaces involving Mg, Ti, and Al is promising.
Electronic speckle pattem inteferometry (ESPI) has been applied to the measurement of deformation, strain, and thermal expansion during the cooling down and warming up processes between room temperature and low temperatures (minimum -20K). Samples are several commercial available metallic (SUS, Al, and Ti) and non-metallic (FRP, Alunina, Teflon, and SiO_2) materials. The ESPI method offers a non-contact and temperature-independent method to measure the displacement of materials subject to large temperature changes, as long as the correlations of the speckle patterns are kept. This metod presents an essential advantage over the conventional ones in that the information remains recorded on the video tape recorder for further analysis. The mechanical behavior of structural materials due to the thermal deformation are successfully measured during the cooling down or warming up processes, and applicability of ESPI methods to the low temperature engineering are experimentally confirmed. Less
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