Experimental Study of Reaming Sizes on Fatigue Life of Cold-Expanded 7050-T7451 Aluminum Alloy

IF 2.4 4区材料科学 Q2 CRYSTALLOGRAPHY Crystals Pub Date : 2024-09-11 DOI:10.3390/cryst14090803

Muyu Guan, Qichao Xue, Zixin Zhuang, Quansheng Hu, Hui Qi

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Abstract

The split-sleeve cold expansion technology is widely used in the aerospace industry, particularly for fastening holes, to enhance the fatigue life of components. However, to ensure proper assembly and improve surface integrity, reaming of the cold-expanded holes is necessary. This study investigates the effects of cold expansion and reaming processes on the fatigue performance of 7050-T7451 aluminum alloy. Fatigue tests, residual stress measurements, and microstructural analyses of the hole edges were conducted on specimens with four different hole diameters after cold expansion and reaming. It was found that the depth of reaming significantly affects fatigue life. During the cold expansion process, the compressive residual stress formed around the hole effectively improves fatigue performance. The experiments demonstrated that reaming by 0.2 mm to 0.4 mm helps eliminate minor defects, thereby improving fatigue life. However, reaming beyond 0.5 mm may lead to stress relief and the removal of dense grains at the hole edges, reducing fatigue life. Therefore, determining the optimal reaming size is crucial for enhancing the reliability of aerospace fasteners.

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铰孔尺寸对冷膨胀 7050-T7451 铝合金疲劳寿命的实验研究

分体式套筒冷膨胀技术在航空航天工业中得到广泛应用，尤其是用于紧固孔，以提高部件的疲劳寿命。然而，为了确保正确装配并提高表面完整性，必须对冷胀孔进行扩孔。本研究探讨了冷膨胀和扩孔工艺对 7050-T7451 铝合金疲劳性能的影响。对冷膨胀和扩孔后的四种不同孔径的试样进行了疲劳试验、残余应力测量和孔边缘微观结构分析。结果发现，铰孔深度对疲劳寿命有很大影响。在冷膨胀过程中，孔周围形成的压缩残余应力有效地改善了疲劳性能。实验表明，扩孔 0.2 毫米至 0.4 毫米有助于消除微小缺陷，从而提高疲劳寿命。然而，扩孔超过 0.5 毫米可能会导致应力释放和孔边缘致密晶粒的去除，从而降低疲劳寿命。因此，确定最佳铰孔尺寸对于提高航空紧固件的可靠性至关重要。

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来源期刊

Crystals CRYSTALLOGRAPHYMATERIALS SCIENCE, MULTIDIS-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

4.20

自引率

11.10%

发文量

1527

审稿时长

16.12 days

期刊介绍： Crystals (ISSN 2073-4352) is an open access journal that covers all aspects of crystalline material research. Crystals can act as a reference, and as a publication resource, to the community. It publishes reviews, regular research articles, and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on article length. Full experimental details must be provided to enable the results to be reproduced. Crystals provides a forum for the advancement of our understanding of the nucleation, growth, processing, and characterization of crystalline materials. Their mechanical, chemical, electronic, magnetic, and optical properties, and their diverse applications, are all considered to be of importance.