Engineering definitions of small crack and long crack at fatigue limit under tensile mean stress and a prediction method for determining the fatigue limit of a cracked Mg alloy
| Autor: | Takuya Kinoshita, Hiroshi Noguchi, Toshiyuki Ishina, Shigeru Hamada, Komei Hayashi, Kazunori Morishige |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
business.industry Mechanical Engineering Structural engineering Crack growth resistance curve Strength of materials Fatigue limit Industrial and Manufacturing Engineering Crack closure Mechanics of Materials Modeling and Simulation mental disorders Ultimate tensile strength General Materials Science Magnesium alloy business Compact tension specimen Stress concentration |
| Zdroj: | International Journal of Fatigue. 56:86-94 |
| ISSN: | 0142-1123 |
| DOI: | 10.1016/j.ijfatigue.2013.08.006 |
| Popis: | A simple method was proposed for evaluating the influence of mean stress on the fatigue limit of a cracked specimen using engineering approximations. Three types of crack sizes were introduced for evaluation: an “extra small crack,” a “small crack,” and a “long crack”. The threshold stress intensity factor range was shown for each size based on crack non-propagation behavior using physical foundations. The effect of mean stress on the fatigue limit of the cracked specimen was formulated, and fatigue tests were performed on a magnesium alloy to check the approximation errors, which were found to be almost within 10%. Furthermore, the small-long crack transition was characterized experimentally. |
| Databáze: | OpenAIRE |
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