缺口对7A85铝合金拉伸性能和疲劳性能的影响

doi:10.11896/cldb.22080021

Abstract
Figure/Table
References
Related Citation (15)

Download:

Full Text ( PDF ) (19796KB)
Export: BibTeX | EndNote (RIS)

Abstract Annular notches with a depth of 0.1 mm and 0.2 mm were prefabricated on the surface of smooth specimens, and the effects of different notch sizes on the tensile and fatigue properties of 7A85 aluminum alloy were investigated, the fatigue fracture mechanism of 7A85 aluminum alloy was also analyzed. The results show that with the increase in notch depth from 0 mm to 0.2 mm, the ultimate tensile strength, elongation and fatigue strength of the specimens decrease by 6%, 47.5% and 44.4%, respectively. The notch of the specimens has a much greater effect on the elongation than tensile strength, which is linearly related to fatigue strength. The fatigue notch factor increases with the increase of notch sizes and fatigue cycles. The fatigue crack sources of 7A85 aluminum alloy are usually iron-rich second-phase particles, and the stress concentration at the bottom of the annular notch promotes the initiation of multiple fatigue crack sources. Furthermore, the effective bearing area of the specimen is rapidly reduced by the simultaneous propagation of multiple cracks, leading to a sharp decrease in fatigue life.

Key words： 7A85 aluminum alloy notch tensile property fatigue property the fatigue notch factor fatigue fracture mechanism

Published: Online: 2023-12-19

CLC number:

TG146

Fund:State Key Laboratory for Mechanical Behavior of Materials (20212317).

	Service
	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	ZHANG Zhuodong
	ZHAO Junwen
	FAN Jun
	ZHANG Haicheng
	GAO Jiewei
	HAN Ruipeng

Cite this article:

ZHANG Zhuodong,ZHAO Junwen,FAN Jun, et al. Effect of Notch on Tensile Properties and Fatigue Properties of 7A85 Aluminum Alloy[J]. Materials Reports, 2023, 37(24): 22080021-7.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.22080021 OR http://www.mater-rep.com/EN/Y2023/V37/I24/22080021

1 Zhou B, Liu B, Zhang S G. Metals, 2021, 11(5), 718.
2 Prabhu T R. Acta Metallurgical Sinica, 2015, 28(7), 909.
3 Khoukhi D E, Morel F, Saintier N, et al. Procedia Structural Integrity, 2022, 38, 611.
4 Wen F, Xing Z, Tan C, et al. Journal of Physics:Conference Series, 2021, 1802(2), 22079.
5 Xiao J, Yi Y P, Cui J D, et al. Materials Reports, 2018, 32(12), 1998 (in Chinese).
肖靖, 易幼平, 崔金栋, 等.材料导报, 2018, 32(12), 1998.
6 Dai P, Luo X, Yang Y, et al. Metallurgical and Materials Transactions, 2020, 51(6), 3248.
7 Luong H, Hill M R. Materials Science & Engineering A, 2008, 477(1), 208.
8 Gao J W.Research on influence of surface pit defect on the fatigue property of high-speed train axle steel. Ph. D.Thesis, Southwest Jiaotong University, China, 2017(in Chinese).
高杰维.表面凹坑缺陷对高速列车车轴钢疲劳性能影响研究. 博士学位论文, 西南交通大学, 2017.
9 Yan G L, Wang H, Kang G Z, et al. Journal of Southwest Jiaotong University, 2016, 51(5), 944 (in Chinese).
闫桂玲, 王弘, 康国政, 等.西南交通大学学报, 2016, 51(5), 944.
10 Benedetti M, Fontanari V, Santus C, et al. International Journal of Fatigue, 2010, 32(10), 1600.
11 Chen S, Chen K, Peng G, et al. Materials and Design, 2012, 35:, 93.
12 Hirakawa K, Toyama K, Kubota M.International Journal of Fatigue, 1998, 20(2), 135.
13 Ma X L. Mechanical Engineering and Automation, 2019(6), 3 (in Chinese).
马小龙.机械工程与自动化, 2019(6), 3.
14 Li M H, Yang Y Q, Ru J G, et al.The Chinese Journal of Nonferrous Metals.2022, 32(2), 353 (in Chinese).
李茂华, 杨延清, 汝继刚, 等. 中国有色金属学报, 2022, 32(2), 353.
15 Gao Z T, Xiong J J. Fatigue reliability, Beijing University of Aeronautics and Astronautics Press, China, 2000, pp.46 (in Chinese).
高镇同, 熊峻江.疲劳可靠性, 北京航空航天大学出版社, 2000, pp.46.
16 Li H F, Zhang P, Wang B, et al. Journal of Materials Science and Technology, 2022, 100(5), 46.
17 Rathin M, Akhilendra S, Surajit K P. Journal of Materials Engineering and Performance, 2021, 30(10), 12.
18 Zhang H, Wang B, Li G, et al. In:Proceedings of the 5th China Aeronautical Science and Technology Conference. Qingdao, 2022, pp. 209.
19 Han M, Xie H J, Li J R, et al. Journal of Materials Engineering, 2019, 47(6):161 (in Chinese).
韩梅, 谢洪吉, 李嘉荣, 等.材料工程, 2019, 47(6), 161.
20 Wang H, Lu M X, Yi X W, et al. Mechanical Science and Technology for Aerospace Engineering, 2015, 34(9), 1451.
21 Zhong Q P, Zhao Z H. Fractography, Beijing Higher Education Press, China, 2006, pp.270 (in Chinese).
钟群鹏, 赵子华.断口学.北京高等教育出版社, 2006, pp.270.
22 Rice J R. Journal of Applied Mechanics, 1968, 35(2), 121.