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Microtexture, Asperities, and Crack Deflection in Al-Li 2090 T8E41 / JD. Haase, A. Guvenilir, JR. Witt, MA. Lang¿̐ưy, SR. Stock

Conference Author
Mixed-Mode Crack Behavior (1998 : Atlanta, GA)
Physical Description
1 online resource (14 pages) : illustrations, figures, tables
Additional Creators
Guvenilir, A., Haase, JD., Lang¿̐ưy, MA., Stock, SR., Witt, JR., American Society for Testing and Materials, and ASTM International
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Summary
Roughness-induced closure is held to be responsible for very low fatigue crack growth rates observed in certain plate orientations of Al-Li 2090 T8E41, and the geometry of asperities producing this closure correlates with macrotexture. Little work, however, has focused on the role of individual grain orientations (microtexture) or of average orientation within small groups of adjacent grains (mesotexture) on the crack's path through a sample, i.e., on whether the variation in grains' orientations determines where the crack will deflect. This paper reports synchrotron X-ray microbeam diffraction mapping of the three-dimensional microtexture in samples of Al-Li 2090. Groups of adjacent pancake-shaped grains are found to have very similar orientations, producing nearly single-crystal regions approaching thicknesses of 0.3 mm along the sample's S (short-transverse) direction. These near-single-crystal volumes produce large asperities with surfaces having substantial Mode III character, asperities which appear over the range of stress intensity ranges observed (~5 to ~25 MPa?m). Results of these experiments suggest not only that this type of mesotexture plays an important role in determining fatigue crack path in compact tension samples of Al-Li 2090 but also that specific orientations of the groups of grains lead to large crack deflections.
Dates of Publication and/or Sequential Designation
Volume 1999, Issue 1359 (January 1999)
Subject(s)
Other Subject(s)
ISBN
9780803154063 (e-ISBN)
9780803126022
0803126026
Digital File Characteristics
text file PDF
Bibliography Note
Includes bibliographical references 23.
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Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
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Reproduction Note
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1999. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
Technical Details
Mode of access: World Wide Web.
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ASTM International PDF Purchase price USD25.
View MARC record | catkey: 28000922