Fatigue Crack Initiation Behavior of Welded AA5083 in a Seawater Environment

[+] Author and Article Information
Saskia Benedictus-deVries

Netherlands Institute for Metals Research (NIMR), Rotterdamseweg 137, 2628 AL Delft, the Netherlands

Ad Bakker, G. C. A. M. Janssen, Hans de Wit

Department of Materials Science and Technology, Delft University of Technology

J. Eng. Mater. Technol 126(2), 199-203 (Mar 18, 2004) (5 pages) doi:10.1115/1.1651098 History: Received October 14, 2003; Revised December 11, 2003; Online March 18, 2004
Copyright © 2004 by ASME
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Technical drawing of used specimen type, according to ASTM E466
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SN-curves and fatigue limits of both unwelded and welded samples, tested in both air and seawater at a stress ratio of 0.1
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Crack initiation location on the reference sample (parent material in air), (left) and EDX-spectrum and composition of observed particle (right)
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Fracture surface of bulk material fatigued in seawater: multiple initiation locations (left) and glazed appearance of initiation sites (right)
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Fatigue crack initiation of welded samples in air always occurs at pores that are located both at the surface (left) as well as sub-surface (right)
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Histogram of the sizes of the initiation locations on welded samples in seawater (left) and typical glazed appearance of one of the smaller initiation locations (right)
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Initiation location of the macroscopic cracks on welded samples in seawater. Both surface (left) and subsurface (right) pores can cause initiation. Due to the glazed appearance flower-like patterns are created at the subsurface intiation sites.
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Calculated values (by means of the theory of Murakami) versus experimental values of the fatigue limit of AA5083 in unwelded and welded condition in both air and seawater
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Schematical process of glazing at the presence of a sub-surface pore




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