| Project/Area Number |
63550067
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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 |
機械材料工学
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
TANAKA Keisuke Kyoto University, Engineering, Associate Professor, 工学部, 助教授 (80026244)
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| Co-Investigator(Kenkyū-buntansha) |
HOSHIDE Toshihiko Kyoto University, Engineering, Associate Professor, 工学部, 助教授 (80135623)
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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 |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1989: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1988: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Ceramics / Fracture / X-Ray diffraction / Crack growth / Fractography / Residual stress / X線回析 / き裂伝ぱ |
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| Research Abstract |
1. For accurate measurements of residual stresses in ceramics by X-rays, the combination between characteristic X-rays and diffraction plane was determined for zirconia and other engineering ceramics. The X-ray stress constant was determined for these diffraction planes.
2. For zirconia-alumina composite, the mean stress in each phase was measured by X- rays, and then the macrostress and microstress were calculated on the basis of rule of mixture.
3. The X-ray method to measure the amount of martensitic transformation from tetragonal to monoclinic phase in zirconia was established.
4. The bending tests of precracked and notched specimens of alumina, silicon nitride and TiC-Cr_3C_2 composite were conducted, and the distribution of the residual stress on the fracture surface was measured by X-rays. For the case of silicon nitride, the compressive residual stress was measured near the fracture surface. This compression is related to the dilatation due to microcracking.
5. The depth of inelastic deformation from the surface determined by X-rays was proportional to the square of the critical stress intensity factor.
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