| 疲劳裂纹扩展过载延迟效应微观机理的研究 |
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| 引用本文： | 何玉定,张平生.疲劳裂纹扩展过载延迟效应微观机理的研究[J].湘潭大学自然科学学报,1993,15(3):100-105. |
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| 作者姓名： | 何玉定 张平生 |
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| 作者单位： | 湘潭大学机械工程系
(何玉定)，西安交通大学(张平生) |
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| 摘 要： | 应用自制的扫描电镜加载台,对60Si_2Mn弹簧钢过载后疲劳裂纹扩展的延迟效应进行了扫描电镜的直接观察.分析和讨论了延迟效应的微观机理.结果表明,拉伸过载引起的裂尖钝化及裂纹扩展方向的偏转都会导致延迟效应。
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| 关 键 词： | 疲劳裂纹扩展 裂纹闭合 延迟效应 |
STUDY ON MICROMECHANISM OF OVERLOAD RETARDATION PHENOMENON IN FATIGUE CRACK GROWTH |
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| He Yuding.STUDY ON MICROMECHANISM OF OVERLOAD RETARDATION PHENOMENON IN FATIGUE CRACK GROWTH[J].Natural Science Journal of Xiangtan University,1993,15(3):100-105. |
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| Authors: | He Yuding |
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| Institution: | He Yuding(Department of Mechanical Engineering)Zhang Pingsheng(Xi'an Jiaotong University) |
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| Abstract: | A direct observation on overload retardation phenomenon offatigue crack propagation in 60Si_2Mn spring-steel was accomplished ona self-made SEM fatigue loading stage. Micromechanism of overloadretardation phenomenon was analysed and discussed.Results showed thattensile overload can cause crack tip to blunt and crack growth directionto deflect,thus,bring about retardation phenomenon of crack growth. |
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| Keywords: | fatigue crack growth crack closure retardation phenomenon SEM direct observation |
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