| LY12CZ板材疲劳损伤及裂纹形成研究 |
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| 引用本文： | 李长春,赵慧霞,李光霞,郑旻仲. LY12CZ板材疲劳损伤及裂纹形成研究[J]. 航空学报, 1989, 10(12): 649-652 |
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| 作者姓名： | 李长春 赵慧霞 李光霞 郑旻仲 |
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| 作者单位： | 华中理工大学(李长春，赵慧霞，李光霞)，航空强度研究所(郑旻仲) |
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| 摘 要： | 受交变载荷的构件,其疲劳损伤裂纹形成阶段在全寿命中占有相当大的比例。已有的疲劳损伤分析要求给出明确的应力或应变控制条件。只有光滑构件才能满足该条件,而缺口构件的疲劳损伤经常发生在缺口根部附近,这里的控制条件是难以准确模拟的。因此对缺口构件的疲劳损伤分析须进行细致的实验观测。
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| 收稿时间： | 1989-04-01; |
A STUDY ON FATIGUE DAMAGE AND CRACK INITIATION OF LY12CZ ALLOY |
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| Huazhong University of Science and Technology,Li Changchun,Zhao Huixia and Li Guangxia Institute of Aeronautical strength Zheng Minzhong. A STUDY ON FATIGUE DAMAGE AND CRACK INITIATION OF LY12CZ ALLOY[J]. Acta Aeronautica et Astronautica Sinica, 1989, 10(12): 649-652 |
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| Authors: | Huazhong University of Science Technology Li Changchun Zhao Huixia Li Guangxia Institute of Aeronautical strength Zheng Minzhong |
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| Affiliation: | 1. Huazhong University of Science and Technology;2. Institute of Aeronautical strength |
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| Abstract: | In this paper, fatigue tests were carried out for different type and size of specimens to study fatigue damage and crack initiation of LY12CZ plate. Using microscopy observation and strain analysis, we have studied tension-tension low cycle fatigue damage. The experimental results show that small crack initiation damage zones exist in the regions of high strain. The size of damage zone is a characteristic value related to material and specimen geometry. Some small cracks in th damage zone merge into a macro-crack and others become non-propagation small cracks. The fatigue damage evolution law describing damage change along with fatigue cycles has been obtained. |
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| Keywords: | fatigue damage crack initiation small crack |
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