基于体积法的缺口件多轴疲劳寿命预测

发布时间：2018-02-12 22:37

本文关键词： 缺口件相对应力梯度体积法疲劳寿命预测　出处：《应用力学学报》2016年04期 　论文类型：期刊论文

【摘要】：针对Mod.9Cr-1Mo钢不同缺口半径下的多轴疲劳试验结果进行模拟计算,采用体积法进行疲劳寿命预测,并与等效应变法的预测结果进行了对比。模拟结果表明,各路径下缺口根部应力集中程度随缺口半径减小而更为明显,最大应力集中程度达3.45。等效应变法给出的疲劳寿命预测结果随着缺口半径的减小而偏于保守,保守量高达90倍。为克服等效应变法给出的偏于保守的结果,基于剪应力随距缺口根部距离的变化趋势进行有效距离的计算,采用体积法进行寿命预测,94.1%的预测结果位于2倍分散带内。
[Abstract]:The multiaxial fatigue test results of Mod.9Cr-1Mo steel with different notched radii are simulated and calculated. The fatigue life is predicted by volume method, and compared with the prediction results of equal-effect variation method. The simulation results show that, The stress concentration at the root of the notch is more obvious with the decrease of the notch radius, and the maximum stress concentration is 3.45. The prediction results of fatigue life obtained by the equal-effect variation method are conservative with the decrease of the notch radius. The conservative quantity is up to 90 times. In order to overcome the conservative results given by the equal-effect variation method, the effective distance is calculated based on the trend of shear stress changing with the distance from the root of the notch. The prediction results of 94.1% of the lifetime predicted by volume method are in the dispersion band of 2 times.
【作者单位】：湖南理工学院机械工程学院;沈阳化工大学能源与动力工程学院;
【基金】：国家自然科学基金(11102119) 国家重点基础研究发展计划(2011CB706504) 湖南省自然科学基金(13JJ6067)
【分类号】：O346.2

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