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Low cycle fatigue behavior of AZ31B extrusion at elevated temperatures
International Journal of Fatigue ( IF 6 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.ijfatigue.2020.105803
A.H. Jabbari , M. Sedighi , H. Jahed , C. Sommitsch

Abstract Fully-reversed strain-controlled tests have been performed on AZ31B magnesium alloy extrusion at room temperature, 100 °C, and 200 °C. Different fatigue life prediction models including Coffin-Manson-Basquin, Smith-Watson-Topper, and Jahed-Varvani were applied to predict the fatigue life. According to the shape of the hysteresis loops at half-life, by increasing the test temperature to 200 °C, the asymmetric behavior of the magnesium changed to a symmetric shape. No inflection point can be observed in the loops at 200 °C, the mean stress decreases dramatically, and the cyclic softening occurs. Among different models, Jahed-Varvani as an energy-based approach offers the most promising predictions at all the temperatures.

中文翻译:

AZ31B 挤压件在高温下的低周疲劳行为

摘要 在室温、100 °C 和 200 °C 下对 AZ31B 镁合金挤压进行了全反向应变控制试验。不同的疲劳寿命预测模型包括 Coffin-Manson-Basquin、Smith-Watson-Topper 和 Jahed-Varvani 被应用于预测疲劳寿命。根据半衰期磁滞回线的形状,通过将测试温度提高到 200 °C,镁的不对称行为变为对称形状。在 200°C 的回路中没有观察到拐点,平均应力急剧下降,并发生循环软化。在不同的模型中,Jahed-Varvani 作为一种基于能量的方法在所有温度下提供了最有希望的预测。
更新日期:2020-10-01
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