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Fatigue tests and a damage mechanics-based fatigue model on a cast Al-Si-Mg aluminum alloy with scratches
International Journal of Fatigue ( IF 6 ) Pub Date : 2022-08-09 , DOI: 10.1016/j.ijfatigue.2022.107198
Susong Yang , Weiping Hu , Zhixin Zhan , Jian Li , Chunyu Bai , Qiang Yang , Qingchun Meng

Scratches can significantly influence the fatigue performance of materials or structures even with several hundred microns depth. In this study, the effect of scratch defects on the fatigue performance of ZL114A cast aluminum alloy is systematically studied. Fatigue tests of scratched smooth specimens and scratched hole plates are conducted. For scratches with the depths of 0.15, 0.25 and 0.35 mm, the mean fatigue life is reduced by about 35 %, 50 % and 61 % compared to unscratched specimens. A novel fatigue damage model based on continuum damage mechanics (CDM) is then developed. This model can well evaluate the fatigue performance of actual components with scratches and is convenient to use by avoiding modeling the real tiny scratch. The comparison between the predicted results and experimental data shows a good accuracy.



中文翻译:

带有划痕的铸造 Al-Si-Mg 铝合金的疲劳试验和基于损伤力学的疲劳模型

即使是几百微米深度的划痕也会显着影响材料或结构的疲劳性能。本研究系统研究了划痕缺陷对ZL114A铸造铝合金疲劳性能的影响。对划伤的光滑试样和划伤的孔板进行疲劳试验。对于深度为 0.15、0.25 和 0.35 mm 的划痕,与未划痕的试样相比,平均疲劳寿命降低了约 35%、50% 和 61%。然后开发了一种基于连续损伤力学(CDM)的新型疲劳损伤模型。该模型可以很好地评估带有划痕的实际部件的疲劳性能,避免模拟真实的微小划痕,使用方便。预测结果与实验数据的对比显示出良好的准确性。

更新日期:2022-08-09
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