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    • 凹坑型硬物损伤对TC4材料疲劳强度的影响

    Xuteng HU,Xu JIA,Zijia ZHU,Dawei JI,Yingdong SONG

    Journal of Aerospace Power（2018）

    Cited 2|Views7
    Abstract
    针对风扇/压气机叶片中叶盆/叶背遭受的硬物损伤(FOD)凹坑型损伤,进行了不同冲击角度下模拟FOD试验、损伤特征与应力集中分析,开展了冲击后不处理和冲击后去残余应力退火试样的高循环疲劳试验研究和疲劳强度的预测.结果表明:损伤深度和应力集中系数均随着冲击角度的增加而变大,损伤深度范围为0.1～0.5mm,应力集中系数范围为1.3～1.7.不同冲击角度条件下,凹坑型损伤试样疲劳强度相对光滑试样下降程度在50％～70％范围内,与应力集中系数并不是呈单调下降关系,最危险冲击角为60°.去残余应力退火后凹坑型损伤试样的高循环疲劳(HCF)性能有所提高,表明残余应力的影响程度不容忽略.去残余应力试样的HCF性能并不是随应力集中系数的增大而下降,验证了微结构损伤的影响,说明损伤深度作为制定可用极限或维修极限的唯一参量具有一定的局限性.对凹坑型损伤试样的疲劳强度的预测误差在±20％以内.
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    Key words
    foreign object damage (FOD),ballistic impact,TC4titanium alloy,fatigue strength,damage characterization,fatigue prediction
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    【要点】：本文研究了凹凸面风扇/压缩机叶片受到凹痕型外来物损伤（FOD）对TC4材料疲劳强度的影响，分析了损伤特性和应力集中，并进行了疲劳强度预测，发现损伤深度和应力集中因素对疲劳强度有显著影响。
    

    【方法】：通过模拟FOD实验、损伤特性分析、应力集中计算以及高周疲劳测试，对受冲击角度不同的样本进行了研究。
    

    【实验】：采用不同冲击角度对TC4材料进行损伤模拟，并在冲击后进行了高周疲劳测试和残余应力缓解退火处理，使用的数据集名称未提及，但实验结果显示损伤深度在0.1-0.5mm范围内，应力集中因子在1.3-1.7范围内，疲劳强度下降50%-70%，且残余应力缓解退火处理改善了高周疲劳行为，预测精度在±20%以内。