Propagation of Fatigue Cracks in Aluminium at Low Temperatures
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- Ogura Tsugio
- The Research Institute for Iron, Steel and Other Metals, Tohoku University
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- Karashima Seiichi
- Department of Materials Science, Faculty of Engineering, Tohoku University
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- Tsurukame Kuniyasu
- Graduate School, Tohoku University
Abstract
Propagation behaviour of fatigue cracks in aluminium was examined at room temperature, 201°K, and 78°K . The purpose of the present investigation is to make clear the fatigue mechanism and also to confirm whether or not the vacancy absorption model for the growth of fatigue cracks, which has been proposed by the present authors, is valid in the case of low temperature fatigue as well.<BR>Slip-line-concentrating region around a fatigue crack was found to be considerably smaller at 201°K and 78°K than at room temperature. It was also clarified that a power law, dl⁄dN=C1KIn, well-known at room temperature, also holds between the rate of fatigue crack growth, dl⁄dN, and the stress intensity factor, KI. In the temperature range examined the growth rate was remarkably affected by temperature, which is expressed by an Arrhenius type equation, dl⁄dN=C2KInexp(−Q⁄kT) where Q=0.03∼0.04 eV.<BR>These results suggest that it is important to take into account a thermally activated process in considering the mechanism of fatigue crack growth. In conclusion, it is shown that the strong temperature dependence of the growth rate can satisfactorily be explained by the vacancy absorption model, provided that the diffusion of vacancies along dislocation cores is assumed.
Journal
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- Transactions of the Japan Institute of Metals
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Transactions of the Japan Institute of Metals 16 (1), 43-48, 1975
The Japan Institute of Metals
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Keywords
Details 詳細情報について
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- CRID
- 1390282680095943424
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- NII Article ID
- 130003485336
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- COI
- 1:CAS:528:DyaE2MXhsF2ms7w%3D
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- ISSN
- 24324701
- 00214434
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed