| 疲劳损伤的激光检测及细观初探 |
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| 引用本文： | 苟文选,王安强.疲劳损伤的激光检测及细观初探[J].机械强度,1997,19(3):17-20. |
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| 作者姓名： | 苟文选 王安强 |
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| 作者单位： | 西北工业大学工程力学系 |
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| 摘 要： | 利用一种非接触、非破坏的激光衍射谱谱面光强检测方法，对ＬＹ１２ＣＺ铝合金板材试样进行了拉－拉非对称循环疲劳损伤检测。证明谱面光强对疲劳损伤是敏感的；衍射光强比Ｋ随循环次数Ｎ的增加单调下降；损伤变量Ｄ则随Ｎ的增加单调增加，当Ｄ达到其临界值Ｄｃ时疲劳破坏发生。同时对不同循环次数下试样表面进行电镜扫描分析，对衍射光强比变化的表面细观状态进行探讨。
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| 关 键 词： | 疲劳损伤 表面粗糙度 衍射光强比 金属 细观 |
FATIGUE DAMAGE DETECTION BY LASER AND MICROSCOPIC TEST |
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| Gou Wenxuan,Wang Anqiang.FATIGUE DAMAGE DETECTION BY LASER AND MICROSCOPIC TEST[J].Journal of Mechanical Strength,1997,19(3):17-20. |
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| Authors: | Gou Wenxuan Wang Anqiang |
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| Abstract: | In this paper,the author make use of a physical quantity directly connected with surface roughness of metal.It is intensity ratio K of laser diffraction spectrum.The specimen surface for different fatigue cycles is observed by Scanning Electron Microscope.The relationshop between D and N (is number of the fatigue cycle) can be used to detect fatigue damage and to estimate surplus life for metal materials. |
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| Keywords: | fatigue damage surface roughness diffraction spectrum intensity ratio |
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