Microscopic analysis of non-propagating fatigue crack tips
| Autor: | Takanori Kato, Yukihiko Kimura, Shigeo Arai, Yoshimasa Takahashi, Taizo Makino |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Scanning electron microscope Mechanical Engineering Oxide 02 engineering and technology 021001 nanoscience & nanotechnology Industrial and Manufacturing Engineering Microscopic scale Crack closure chemistry.chemical_compound 020303 mechanical engineering & transports 0203 mechanical engineering chemistry Mechanics of Materials Transmission electron microscopy Modeling and Simulation General Materials Science Crystallite Composite material 0210 nano-technology Compact tension specimen Layer (electronics) |
| Zdroj: | International Journal of Fatigue. 125:122-127 |
| ISSN: | 0142-1123 |
| DOI: | 10.1016/j.ijfatigue.2019.03.043 |
| Popis: | Herein, the phenomena around a non-propagating fatigue crack tip in polycrystalline interstitial-free steel were investigated on a microscopic scale. A non-propagating fatigue crack was introduced in a standard compact tension specimen using a load-shedding procedure. The near-tip area was subsequently investigated via scanning electron microscopy and transmission electron microscopy. The wake in the tip area was covered with an oxide layer. Discrete dislocations, whose densities were relatively low, were only found in front of the crack. These results may suggest that an increase of the opening point was attributable to the oxide-induced crack closure rather than the plasticity-induced one. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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