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ASTM Selected Technical Papers
Fatigue Mechanisms
By
JT Fong
JT Fong
1
Editor, and Chairman of Symposium Organizing Committee
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ISBN-10:
0-8031-0345-X
ISBN:
978-0-8031-0345-0
No. of Pages:
923
Publisher:
ASTM International
Publication date:
1979
eBook Chapter
On the Process of Subsurface Fatigue Crack Initiation in Ti-6Al-4V
By
J Ruppen
,
J Ruppen
1
Graduate assistant, post doctoral research fellow, and professor
, respectively, Metallurgy Department, Institute of Materials Science, University of Connecticut
, Storrs, Conn. 06268
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P Bhowal
,
P Bhowal
1
Graduate assistant, post doctoral research fellow, and professor
, respectively, Metallurgy Department, Institute of Materials Science, University of Connecticut
, Storrs, Conn. 06268
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D Eylon
,
D Eylon
2Department of Materials Science and Metallurgical Engineering,
University of Cincinnati
, Cincinnati, Ohio 45221
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AJ McEvily
AJ McEvily
1
Graduate assistant, post doctoral research fellow, and professor
, respectively, Metallurgy Department, Institute of Materials Science, University of Connecticut
, Storrs, Conn. 06268
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Page Count:
22
-
Published:1979
Citation
Ruppen, J, Bhowal, P, Eylon, D, & McEvily, A. "On the Process of Subsurface Fatigue Crack Initiation in Ti-6Al-4V." Fatigue Mechanisms. Ed. Fong, J. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959 : ASTM International, 1979.
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The process of subsurface crack initiation in Ti-6AI-4V has been investigated in some detail. At low stress amplitudes, slip occurs primarily on prism planes and is blocked at α-β interfaces. The piled-up dislocations induce slip in the β-phase under cyclic loading which can lead to the formation of a Cottrell cleavage knife and thereby provide a site for subsurface crack initiation. At high stress amplitudes, pyramidal slip becomes operative and as a consequence a more compatible type of plastic deformation between the two phases can develop. Under these circumstances the tendency for subsurface crack initiation may be reduced.
References
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, A. H.
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, K.
, “On Slip and Yielding of Alloys with Lamellar Microstructures
,” submitted for publication, 1978
.
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