The Effects of Shot and Laser Peening on Fatigue Life and Crack Growth in 2024 Aluminum Alloy and 4340 Steel PDF Download
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Category :
Languages : en
Pages : 26
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Author:
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ISBN:
Category :
Languages : en
Pages : 26
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Author: W. O. Soboyejo
Publisher: Minerals, Metals, & Materials Society
ISBN:
Category : Architecture
Languages : en
Pages : 632
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Book Description
Examining underlying mechanisms governing the high-cycle fatigue behavior of structural materials, this book from Materials Week '97 focuses on the high-cycle fatigue behavior of existing aluminum, nickel, and titanium-base alloys. Mechanical and empirical approaches to the assessment of environment and temperature effects are examined, along with probable approaches for the prediction of high-cycle fatigue behavior under both uniaxial and multiaxial stresses.
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ISBN:
Category : Metallurgy
Languages : en
Pages : 972
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Category : Aeronautics
Languages : en
Pages : 974
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Category : Dissertation abstracts
Languages : en
Pages : 896
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Author: American Helicopter Society
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Category : Helicopters
Languages : en
Pages : 628
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ISBN:
Category : Chemistry
Languages : en
Pages : 2692
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ISBN:
Category : Government publications
Languages : en
Pages : 1656
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781721288151
Category :
Languages : en
Pages : 38
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Fatigue and crack growth tests have been conducted on 4340 steel and 2024-T3 aluminum alloy, respectively, to assess the effects of shot peening on fatigue life and the effects of shot and laser peening on crack growth. Two current programs involving fixed and rotary-wing aircraft will not be using shot peened structures. Since the shot peening compressive residual stress depth is usually less than the 0.05-inch initial damage tolerance crack size, it is believed by some that shot peening should have no beneficial effects toward retarding crack growth. In this study cracks were initiated from an electronic-discharged machining flaw which was cycled to produce a fatigue crack of approximately 0.05-inches in length and then the specimens were peened. Test results showed that after peening the crack growth rates were noticeably slower when the cracks were fairly short for both the shot and laser peened specimens resulting in a crack growth life that was a factor of 2 to 4 times greater than the results of the average unpeened test. Once the cracks reached a length of approximately 0.1-inches the growth rates were about the same for the peened and unpeened specimens. Fatigue tests on 4340 steel showed that the endurance limit of a test specimen with a 0.002-inch-deep machining-like scratch was reduced by approximately 40 percent. However, if the "scratched" specimen was shot peened after inserting the scratch, the fatigue life returned to almost 100 percent of the unflawed specimens original fatigue life. Everett, R. A., Jr. and Matthews, W. T. and Prabhakaran, R. and Newman, J. C., Jr. and Dubberly, M. J. Langley Research Center NASA/TM-2001-210843, NAS 1.15:210843, ARL-TR-2363, L-18065
Author:
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ISBN:
Category : Science
Languages : en
Pages : 1004
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