2017 Fiscal Year Final Research Report
Non-destructive evaluation of micro fatigue damage in CFRP by positron annihilation line-shape and lifetime analyses
| Project/Area Number |
16K14114
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Gifu University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
柿内 利文 岐阜大学, 工学部, 准教授 (20452039)
大谷 章夫 京都工芸繊維大学, 繊維学系, 准教授 (80569533)
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| Project Period (FY) |
2016-04-01 – 2018-03-31
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| Keywords | 疲労 / CFRP / 損傷評価 / 非破壊検査 / 陽電子消滅 |
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| Outline of Final Research Achievements |
Axial loading fatigue tests were conducted using carbon fiber reinforced thermoplastics (CFRTP) using twilled fiber bundles. Accumulating fatigue damaged was nondestructively evaluated by a positron annihilation method, in which positron annihilation life time and S parameter were used for the evaluation. In the present case, S parameter is defined from the γ-ray energy distribution. In the early stage of fatigue life, S parameter sharply increased with increasing number of loading cycles. Subsequently, S parameter decreased in the middle and final stages of fatigue life. Microstructural observation revealed that transvers fatigue cracks were formed in the early stage of fatigue life, and the number of cracks increased with loading cycles. It could be concluded that S parameter could evaluate the fatigue damage accumulation in CFRTP. However, positron lifetime was insensitive to the fatigue damage.
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| Free Research Field |
疲労破壊
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