| 短裂纹疲劳扩展的试验方法 |
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| 引用本文： | 焦良,倪惠玲.短裂纹疲劳扩展的试验方法[J].航空学报,1986,7(6):636-639. |
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| 作者姓名： | 焦良 倪惠玲 |
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| 作者单位： | 西北工业大学 |
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| 摘 要： | 近十年来,人们发现短裂纹具有一系列不同于普通长裂纹的特异扩展规律,它对耐久性损伤容限分析具有重要的意义。短裂纹扩展率试验是短裂纹研究中一项迫切而重要的,同时也是较为困难的工作。
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| 收稿时间： | 1986-03-08; |
TEST METHOD OF SHORT CRACK PROPAGATION UNDER FATIGUE LOADS |
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| Jiao Liang,Ni Huiling.TEST METHOD OF SHORT CRACK PROPAGATION UNDER FATIGUE LOADS[J].Acta Aeronautica et Astronautica Sinica,1986,7(6):636-639. |
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| Authors: | Jiao Liang Ni Huiling |
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| Institution: | Northwestern Polytechnical University |
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| Abstract: | A double step precracking technique is suggested for gaining an original crack which will be accepted as a genuine short crack. An optimum precracking program under falling amplitude fatigue loadis proposed which can, in combination with the double step precracking technique, reduce the stress intensity range K to below the threshold valve K （defined for long racks in engineering）, and can effectively shorten precracking time. A method of locating crack tip on the specimen surface is presented to make identification of the crack tip convenient and accurate. |
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