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工程力学  2014 

非比例载荷下缺口件疲劳寿命预测

DOI: 10.6052/j.issn.1000-4750.2013.04.0352

Keywords: Mod.9Cr-1Mo钢,缺口半径,裂纹萌生寿命,非比例载荷,Neuber律,疲劳寿命预测

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Abstract:

针对Mod.9Cr-1Mo铁素体钢缺口件进行了一系列非比例载荷低周疲劳试验,采用直流电位差法测量裂纹萌生寿命,比较了缺口半径和应变路径对疲劳裂纹萌生寿命的影响。结果表明,缺口件裂纹萌生寿命占总寿命的比例与材料类型、应变路径相关,更与缺口半径尺寸直接相关。同一路径下,随着缺口半径增加,裂纹萌生寿命所占比例增大。采用Neuber律进行缺口局部应力-应变损伤的计算,结合Smith-Watson-Topper(SWT)模型和Kandil-Brown-Miller(KBM)模型进行疲劳寿命预测。结果表明,除单轴路径和比例路径外,SWT模型得到的预测结果偏于不安全;KBM模型除对单轴预测偏于保守外,其他预测值较好,总体预测结果位于2倍分散带内。

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