Author: Robert A. Hafley
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 46
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Book Description
The fatigue crack growth rate of aluminum-lithium (Al-Li) alloy 2195 plate and weldments was determined at 200°F, ambient temperature and -320°F. The effects of stress ratio (R), welding process, orientation and thickness were studied. Results are compared with plate data from the Space Shuttle Super Lightweight Tank (SLWT) allowables program. Data from the current series of tests, both plate and weldment, falls within the range of data generated during the SLWT allowables program.
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781720523376
Category :
Languages : en
Pages : 44
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Book Description
The fatigue crack growth rate of aluminum-lithium (Al-Li) alloy 2195 plate and weldments was determined at 200-F, ambient temperature and -320-F. The effects of stress ratio (R), welding process, orientation and thickness were studied. Results are compared with plate data from the Space Shuttle Super Lightweight Tank (SLWT) allowables program. Data from the current series of tests, both plate and weldment, falls within the range of data generated during the SLWT allowables program.Hafley, Robert A. and Wagner, John A. and Domack, Marcia S.Langley Research CenterALUMINUM-LITHIUM ALLOYS; CRACK PROPAGATION; WELDED JOINTS; WELD TESTS; CRACKING (FRACTURING); FATIGUE (MATERIALS); CRACKS; PLASMA ARC WELDING; FRICTION WELDING; REUSABLE LAUNCH VEHICLES
Author: Jayabrata Chaudhuri
Publisher:
ISBN:
Category :
Languages : en
Pages : 134
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 162
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Book Description
Author: T. S. Baker
Publisher:
ISBN:
Category : Manufacturing processes
Languages : en
Pages :
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Author: Royce G. Forman
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 54
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Book Description
Axial load fatigue and fracture tests were conducted on thick welded plates of 2219-T87 aluminum alloy to determine the tensile strength properties and the flaw growth behavior in electron beam, gas metal arc, and pulse current gas tungsten arc welds for plates 6.35 centimeters (2.5 in.) thick. The tests were conducted in room temperature air and in liquid nitrogen environments. Specimens were tested in both the as-welded and the aged after welding conditions. The experimental crack growth rate were correlated with theoretical crack growth rate predictions for semielliptical surface flaws.
Author: S. J Hudak
Publisher: ASTM International
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 374
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Author: G. Glinka
Publisher:
ISBN:
Category : Crack propagation
Languages : en
Pages : 17
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Book Description
The research deals with the effect of welding residual stresses on fatigue crack growth in medium strength low alloy steel weldments. Three kinds of flat specimens have been used--unwelded specimens, specimens with butt perpendicular welds, and specimens with butt longitudinal welds. Residual stress distributions were others in both kinds of welded specimens. All specimens were tested under constant and variable amplitude load with stress ratios R > 0. Forman's equation and Wheeler's model of crack retardation were used for theoretical analysis of fatigue crack growth under constant and variable amplitude load, respectively. The theoretical results were more realistic when effective stress ratio Reff and effective stress intensity range ?Keff, which compensated for residual stresses, were used. It was found that the tensile residual stresses increased the fatigue crack growth rate and compressive stresses reduced it. The lower the applied load, the higher the residual stress effect. This paper presents both experimental results and an analytical method of fatigue crack growth prediction in steel weldments on the basis of results obtained from parent material properties.
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781721800650
Category :
Languages : en
Pages : 24
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Book Description
Experimental test procedures for the development of fatigue crack growth rate data has been standardized by the American Society for Testing and Materials. Over the past 30 years several gradual changes have been made to the standard without rigorous assessment of the affect these changes have on the precision or variability of the data generated. Therefore, the ASTM committee on fatigue crack growth has initiated an international round robin test program to assess the precision and variability of test results generated using the standard E647-00. Crack growth rate data presented in this report, in support of the ASTM roundrobin, shows excellent precision and repeatability. Forth, Scott C. and Wright, Christopher W. and Johnston, William M., Jr. Langley Research Center NASA/TM-2005-213907, L-19163
Author: B. F. Jones
Publisher:
ISBN:
Category :
Languages : en
Pages : 33
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Book Description
Low frequency fatigue crack growth rates in air and seawater are reported for manual metal arc, synergic metal inert gas, electron beam and laser beam welds in Q1N steel. The stress corrosion crack growth susceptibility in seawater of the weldments was also studied and both the electron beam and laser beam welds exhibited susceptibility whilst the other welds and parent steel did not. All welds except the 'as-welded' laser beam welds showed silmilar fatigue crack growth rates to the parent plate. When tested in seawater the laser beam weld was found to exhibit exceptionally fast crack growth rates. The factors influencing fatigue crack growth in weldments are discussed. (Author).
