Fatigue Damage Behavior and Mechanism Research of 2198 Aluminum-Lithium Alloy Sheet with Error Holes

作     者：Chen, Yajun Yuan, Tao Cui, Zifan Zhang, Zichen Zhou, Y. F. Guo, Da 

作者机构：Civil Aviat Univ China Sino European Inst Aviat Engn Tianjin 300300 Peoples R China Civil Aviat Univ China Aeronaut Engn Inst Tianjin 300300 Peoples R China 

出 版 物：《JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE》 (J Mater Eng Perform)

年 卷 期：2025年第34卷第5期

页      面：3740-3754页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：2198-T8 aluminum-lithium alloy error hole damage digital image correlation techniques fatigue performance finite element simulation 

摘      要：In this paper, we investigated the impact of manual drilling in the actual production process on the structural material properties of the airframe. Specifically, we focused on elliptical and inclined holes and studied the effects of different parameters on the fatigue life of 2198-T8 skin sheets using Digital Image Correlation. Through our experimental tests, we found significant correlations between the shape of the holes and the structural properties of the airframe. The results indicate that the fatigue life is somewhat enhanced when the long-axis direction of the elliptical hole and inclined direction of the inclined hole align with the direction of external load, leading to weakened stress concentration. Nevertheless, when the direction is not aligned, the fatigue performance considerably decreases, resulting in a minimum life that is just 46.5% of that of a standard hole. When the fatigue crack in the slanted aperture widens, there is a marked discrepancy in the length of the two sides of the sheet, and the damage is not readily observable in the initial stages. This leads to a formidable potential issue. ABAQUS and FRANC3D were employed to simulate the progression of the fatigue crack, and these simulations were then integrated with Fe-Safe for fatigue longevity forecasting. The outcomes obtained from the simulations correlate well with the empirical data.