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多轴疲劳理论已经被大量的常规材料试验数据所证实,但是它们对航空材料的预测能力还没有进行广泛的验证。利用文献中三类航空材料的多轴疲劳试验数据,评估分析了六种基于临界平面法的多轴疲劳寿命预测模型对它们的预测能力。通过对比分析指出:Ince-Glinka模型最适合预测航空合金钢的疲劳寿命,而对于钛合金以及镍基合金,Brown-Miller模型最能准确预测其疲劳寿命。同时,合理的疲劳寿命预测模型需要全面考虑材料的失效模式及受力特点,而为了准确预测材料的疲劳寿命,则需要选择精确的应变疲劳参数。
The theory of multiaxial fatigue has been confirmed by a large number of conventional material test data, but they have not yet been extensively validated on the predictability of aeronautical materials. Based on the multiaxial fatigue test data of three types of aeronautical materials in the literature, six kinds of predictions of multiaxial fatigue life prediction models based on the critical plane method are evaluated. The comparative analysis shows that the Ince-Glinka model is the most suitable for predicting the fatigue life of aviation alloy steels, while the Brown-Miller model can most accurately predict the fatigue life of titanium alloy and nickel-base alloy. At the same time, the reasonable fatigue life prediction model needs to fully consider the material failure mode and stress characteristics, and in order to accurately predict the fatigue life of materials, you need to select the accurate strain fatigue parameters.