| 60Si_2Mn钢变幅疲劳的扫描电镜直接观察 |
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| 引用本文： | 张平生,蔡和平,何玉定.60Si_2Mn钢变幅疲劳的扫描电镜直接观察[J].西安交通大学学报,1990(4). |
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| 作者姓名： | 张平生 蔡和平 何玉定 |
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| 作者单位： | 西安交通大学金属材料及强度研究所，西安交通大学金属材料及强度研究所，西安交通大学金属材料及强度研究所 |
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| 摘 要： | 应用自制的扫描电镜疲劳加载台,对60Si2Mn 弹簧铜过载或欠载时疲劳裂纹扩展的延迟与加速效应进行了扫描电镜的直接观察.结果表明,尖峰载荷会使闭合力K_(c1) 发生明显变化.欠载会使 K_(c1) 下降,其与裂纹顶端的反转压缩塑性区有关.
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| 关 键 词： | 疲劳 裂纹闭合 扫描电子显微镜 铜/直接观察 |
DIRECT OBSERVATION ON VARIABLE AMPLITUDE FATIGUE BEHAVIORS IN 60Si2Mn STEEL BY SEM |
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| Zhang Pingsheng Cai Heping He Yuding.DIRECT OBSERVATION ON VARIABLE AMPLITUDE FATIGUE BEHAVIORS IN 60Si2Mn STEEL BY SEM[J].Journal of Xi'an Jiaotong University,1990(4). |
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| Authors: | Zhang Pingsheng Cai Heping He Yuding |
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| Institution: | Research Institute for Strength of Metals |
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| Abstract: | Direct observation was accomplished on overload retardation and underload acceleration phenomena of fatigue crack growth in 60Si2Mn spring-steel by self-made SEM fatigue loading stage.Results showed that the spike load may cause the closure force,Kcl,to change obviously,and under-spike load may reduce Kcl.The acceleration effect is associated with the crack tip reversed compre-ssive plastic deformation zone. |
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| Keywords: | fatigue steel direct observation crack closure SEM |
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