This study investigated the effect of countersunk hole depths (0.65, 0.90, and 1.20 mm) on the fatigue performance of the riveted AA2024-T3 alloy. The fatigue fracture of the samples was observed by scanning electron microscopy. The strain at the countersink hole was analyzed by finite element (FE) method. The stress intensity and stress concentration factor of the countersunk holes were calculated. The rationality of the FE analysis and theoretical calculation was verified by measuring the strain near the countersunk holes. The high cycle fatigue life of the samples with a countersunk depth of 1.20 mm was far less than the other samples. In contrast, the low cycle fatigue life changed insignificantly.

这项研究调查了埋头孔深度（0.65、0.90和1.20毫米）对铆接AA2024-T3合金疲劳性能的影响。通过扫描电子显微镜观察样品的疲劳断裂。通过有限元（FE）方法分析了s孔处的应变。计算了埋头孔的应力强度和应力集中系数。通过测量埋头孔附近的应变，验证了有限元分析和理论计算的合理性。埋头深度为1.20 mm的样品的高循环疲劳寿命远小于其他样品。相反，低循环疲劳寿命变化不大。