The light weight of magnesium alloys makes them a promising material in different potential industries, such as aerospace and automobile. In addition, magnesium alloys are attractive materials for biomedical applications due to their biocompatibility with the human body. The applications of these alloys in structural parts require an understanding of their fatigue behavior because they are usually subjected to time-varying loading. Furthermore, notches are inevitable in structural parts. Geometrical discontinuities weaken structures because they act as stress raisers. Localized cyclic plasticity around notches leads to crack formation and final failure. The main objective of this research was to investigate the fatigue failure of ZK60-T5 extrusion in the presence of a notch. U-notched specimens with a diameter of 16 mm, notch radius of 1.5 mm, and notch depth of 1.5 mm were machined along the extrusion direction. Cyclic tests were performed under completely reversed cyclic loading and ambient conditions. The results obtained from the cyclic tests of the U-notched specimens were compared with those of unnotched and V-notched specimens to assess the effects of both the presence and the geometry of a notch on fatigue life. The strain energy density approach was successfully used to analyze the fatigue behavior of the U-notch specimens.

中文翻译：

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使用应变能密度法预测U型缺口ZK60镁样品的疲劳失效

镁合金的轻质性使其成为航空航天和汽车等不同潜在行业的有前途的材料。另外，镁合金由于其与人体的生物相容性而成为生物医学应用中有吸引力的材料。这些合金在结构零件中的应用需要了解它们的疲劳性能，因为它们通常承受随时间变化的载荷。此外，在结构部件中不可避免地存在缺口。几何上的不连续性削弱了结构，因为它们充当了应力提升者。缺口周围的局部循环可塑性导致裂纹形成和最终破坏。这项研究的主要目的是研究在存在缺口的情况下ZK60-T5挤压件的疲劳破坏。U形试样的直径为16毫米，切口半径为1.5毫米，沿着挤压方向加工出1.5mm的切口深度。在完全相反的循环载荷和环境条件下进行循环测试。将U型缺口样品的循环测试结果与未缺口和V型缺口样品的循环测试结果进行比较，以评估缺口的存在和几何形状对疲劳寿命的影响。应变能密度方法已成功用于分析U型缺口试样的疲劳行为。将U型缺口样品的循环测试结果与未缺口和V型缺口样品的循环测试结果进行比较，以评估缺口的存在和几何形状对疲劳寿命的影响。应变能密度方法已成功用于分析U型缺口试样的疲劳行为。将U型缺口样品的循环测试结果与未缺口和V型缺口样品的循环测试结果进行比较，以评估缺口的存在和几何形状对疲劳寿命的影响。应变能密度方法已成功用于分析U型缺口试样的疲劳行为。