1994 Fiscal Year Final Research Report Summary
Research on clarication of fatigue mechanism in metal matrix composites and evaluation method for its mechanical characteristics
| Project/Area Number |
05650084
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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 |
Materials/Mechanics of materials
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
NOGUCHI Hiroshi Kyushu University Faculty of Engineering, Dept.of mechanical science and engineering Associate Professor., 工学部, 助教授 (80164680)
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| Co-Investigator(Kenkyū-buntansha) |
AONO Yuuta The same as the head investigator, Research Associate, 工学部, 助手 (70264075)
ODA Yasuji The same as the head investigator, Research Associate, 工学部, 助手 (20091340)
NISITANI Hironobu The same as the head investigator, Professor, 工学部, 教授 (20037708)
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| Project Period (FY) |
1993 – 1994
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| Keywords | Metal Matrix Composites / SiC Whisker / Aluminum Alloy / Fatigue Strength / Fatigue Crack Initiation / Fatigue Crack Propagation |
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| Research Abstract |
In this research, rotating-bending and push-pull fatigue tests of the SiC whisker reinforced 6061-T6,2024-T4 and 7057-6T aluminum alloy made by powder metallurgy were carried out to investigate the fatigue mechanism of plain and notched specimens at room temperature. The fatigue mechanisms in three materials were clarified through successive surface observations using the plastic replica method. Obtained results are as follows.
(1) Fatigue strength of all MMC increase and are about as high as the steel.
(2) The fatigue life is consumed in the fatigue propagation life of small crack by 100mum.
(3) All MMC has a notch sensitivity, and the fatigue limit with a blunt notch has a large statistical factor.
(4) It is indicated from (3) andf (4) that the fatigue life of all MMC has a large scatter.
(5) A simple method for predictiction of statistical fatigue life is important.
(6) There is an optimum volume fraction of SiC whisker for each mechanical property, and it is dependent on the characteristics of matrix.
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