A Study of Fatigue and Fracture in 7075-T6 Aluminum Alloy in Vacuum and Air Environments PDF Download
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Author: Charles Michael Hudson Publisher: ISBN: Category : Aluminum alloys Languages : en Pages : 42
Book Description
Axial load fatigue life, fatigue-crack propagation, and fracture toughness experiments were conducted on sheet specimens made of 7075-T6 aluminum alloy. These experiments were conducted at pressures ranging from atmospheric to 5 x 10 to the minus 8th torr. Analysis of the results from the fatigue life experiments indicated that for a given stress level, lower air pressures produced longer fatigue lives. At a pressure of 5 x 10 to the minus 8th torr fatigue lives were 15 or more times as long as at atmospheric pressure. Analysis of the results from the fatigue crack propagation experiments indicated that for small stress intensity factor ranges the fatigue crack propagation rates were up to twice as high at atmospheric pressure as in vacuum. The fracture toughness of 7075-T6 was unaffected by the vacuum environment. Fractographic examination showed that specimens tested in both vacuum and air developed fatigue striations. Considerably more striations developed on specimens tested at atmospheric pressure, however.
Author: Charles Michael Hudson Publisher: ISBN: Category : Aluminum alloys Languages : en Pages : 42
Book Description
Axial load fatigue life, fatigue-crack propagation, and fracture toughness experiments were conducted on sheet specimens made of 7075-T6 aluminum alloy. These experiments were conducted at pressures ranging from atmospheric to 5 x 10 to the minus 8th torr. Analysis of the results from the fatigue life experiments indicated that for a given stress level, lower air pressures produced longer fatigue lives. At a pressure of 5 x 10 to the minus 8th torr fatigue lives were 15 or more times as long as at atmospheric pressure. Analysis of the results from the fatigue crack propagation experiments indicated that for small stress intensity factor ranges the fatigue crack propagation rates were up to twice as high at atmospheric pressure as in vacuum. The fracture toughness of 7075-T6 was unaffected by the vacuum environment. Fractographic examination showed that specimens tested in both vacuum and air developed fatigue striations. Considerably more striations developed on specimens tested at atmospheric pressure, however.
Author: C. M. Hudson Publisher: ISBN: Category : Materials Languages : en Pages : 32
Book Description
The current state of knowledge of the effects of a vacuum environment upon fatigue is summarized in this report. The effects of temperature, pressure variations, prolonged exposure, and environment composition on fatigue life are discussed in detail. In addition, studies of the surfaces of specimens fatigued in vacuum are described. Results indicate that fatigue life is better in vacuum than in air for most of the materials investigated. Most investigators attribute this increase in life to decreased oxidation of the material in the vacuum environment.
Author: United States. Superintendent of Documents Publisher: ISBN: Category : Government publications Languages : en Pages : 1446
Book Description
February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index
Author: Charles Michael Hudson
Author: Charles Michael Hudson
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Author: Charles Michael Hudson
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Author: S. W. Dean
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Author: United States. Superintendent of Documents
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Author: C. M. Hudson
Author: United States. Superintendent of Documents