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基于疲劳裂纹尖端的应力和应变以及高强铝合金中不同尺度第二相性态对其延性的影响,建立了高强铝合金中粗大第二相、中间尺度第二相以及细小时效强化相性态与其疲劳裂纹扩展速率之间的多元非线性关系模型。结果表明:对于2024铝合金的疲劳扩展速率,该模型的预测趋势与他人的实验研究结果吻合良好。同时借助于对该模型的理论分析,提出了在确保高强铝合金强度不降低的前提下降低其疲劳裂纹扩展速率的优化方案。
Based on the stress and strain at the tip of the fatigue crack and the influence of the second phase of different scales on the ductility of the high-strength aluminum alloy, the properties of the second phase, the second phase in the middle scale, the microstructure and the fatigue crack Multiple non-linear relational model between rate expansion. The results show that the predictive trend of the model for 2024 aluminum alloy is in good agreement with the experimental results of others. At the same time, by means of the theoretical analysis of the model, an optimization scheme is proposed to reduce the fatigue crack growth rate without reducing the strength of the high strength aluminum alloy.