转动惯量法在多轴疲劳裂纹方向预测中的应用
首发时间:2019-05-05
摘要:随着工业的发展,疲劳寿命预测的重要性越来越引起广泛,然而在这个过程中,定量确定多轴非比例荷载下的疲劳寿命及裂纹角度仍比较困难。通过与临界面法的结合,一种预测多轴非比例加载下金属材料疲劳寿命的方法被提出。该方法通过对应力/应变在各个可能的临界面上进行投影并估算其损伤参量,并结合Smith-Watson-Topper和Fatemi-Socie多轴疲劳寿命预测模型计算裂纹萌生寿命并确定裂纹面方向。在此过程中,转动惯量法被用于计算临界面上等效剪切应变幅值。最终通过8种不同加载路径下的316L不锈钢非比例多轴疲劳试验,验证了此方法的有效性。
关键词: 疲劳裂纹 多轴非比例加载 临界面法 疲劳寿命预测 转动惯量法
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Application of moment of inertia method in multiaxial fatigue life prediction
Abstract:With the development of industry growth, the importance of fatigue life prediction has attracted more attentions. During the process, quantitatively determine the multiaxial fatigue life and initiation crack angle are still far from being settled. A multiaxial fatigue life prediction based on critical plan method has been presented. The each damage parameter has been estimated through projecting the stress/strain on every possible candidate plane. Combined with Smith-Watson-Topper and Fatemi-Socie multiaxial fatigue criteria, the fatigue life and crack growth direction have been calculated. Moreover, the Moment of Inertia (MOI) method has been implemented to compute the shear strain amplitude on critical plan. The effectiveness of the proposed method has been validated through the results of eight different non-proportional multiaxial fatigue tests of 316L stainless material.
Keywords: Fatigue crack Multiaxial non-proportional loading Critical plan method Fatigue life prediction Moment of inertia method
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