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利用扫描电镜(SEM)原位观测技术,研究了高温下铝合金试件在循环应力作用下的疲劳短裂纹萌生行为,结果表明,温度对于短裂纹行为具有强烈的影响。基于局部应变法,文中提出了一种预测温度作用下的铝合金疲劳裂纹短萌生寿命的评估公式。
The fatigue crack initiation behavior of aluminum alloy specimens under cyclic stress was studied by scanning electron microscopy (SEM) in situ observation. The results show that the temperature has a strong influence on the behavior of short cracks. Based on the local strain method, a prediction formula of fatigue life of fatigue crack in aluminum alloy is proposed in this paper.