孔边倒角和预腐蚀作用下航空铝合金疲劳性能及断裂机理研究

doi:10.11868/j.issn.1001-4381.2016.06.015

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Abstract Fatigue fracture often occurs because of the corrosion damage to aerospace structural aluminum alloy with holes. Fatigue tests of 7075 aluminum alloy of both unchamfered and chamfered double-hole specimens under uncorrosion and 24h pre-corrosion were carried out. The influence of both pre-corrosion damage and orifice chamferer on fatigue properties and the differences of fatigue fracture characteristics were analyzed. The results show that the effect on fatigue life of pre-corrosion damage is significant. Median fatigue lives of both unchamfered and chamfered double-hole specimens under 24h pre-corrosion decrease about 31.74% and 26.92% compared with uncorrosion specimens. The orifice chamferer have a certain effect on fatigue life of both uncorrosion and 24h pre-corrosion specimens, with median fatigue lives decreased about 28.02% and 15.36% compared with unchamfered specimens, the main reason is due to the stress concentration after orifice chamfered, on the other hand, cutting marks lead to pre-damage during the orifice chamfering process which will result in an increase of the fatigue crack initiation sites and the fracture probability.

Key words： aluminum alloy orifice chamfer pre-corrosion damage corrosion pit fatigue fracture

Received: 15 May 2015 Published: 13 June 2016

ZTFLH:	V252
	V216

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	Articles by authors
	ZHOU Song
	WANG Lei
	MA Chuang
	YANG Lin-qing
	XU Liang
	HUI Li

Cite this article:

ZHOU Song,WANG Lei,MA Chuang, et al. Fatigue Properties and Fracture Mechanism of Aluminum Alloy with Orifice Chamfer and Pre-corrosion Damage[J]. Journal of Materials Engineering, 2016, 44(6): 98-103.

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http://jme.biam.ac.cn/EN/10.11868/j.issn.1001-4381.2016.06.015 OR http://jme.biam.ac.cn/EN/Y2016/V44/I6/98

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