Fatigue of As-Fabricated Open Cell Aluminum Foams

[+] Author and Article Information
J. Zhou, W. O. Soboyejo

Princeton Materials Institute and The Department of Mechanical and Aerospace Engineering, Princeton University, Olden Street, Princeton, NJ 08540

Z. Gao, A. M. Cuitino

The Department of Mechanical and Aerospace Engineering, Rutgers University Piscataway, NJ 08854

J. Eng. Mater. Technol 127(1), 40-45 (Feb 22, 2005) (6 pages) doi:10.1115/1.1836770 History: Received January 01, 2003; Revised September 14, 2004; Online February 22, 2005
Copyright © 2005 by ASME
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The as-fabricated foams were sandwiched using top and bottom aluminum face sheets
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Cumulative strain curves: (a) strain curves on half-log scale, (b) strain curves on linear scale, and (c) a half-log scale strain curve of a specimen tested at a load ratio of 0.90. Numbers in (a) and (b) indicate the stress ratios at which the corresponding specimens were tested.
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S-N curve behavior of the as-fabricated open cell aluminum foams
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Two-dimensional strain fields to show the strain evolution and distribution of the localized deformation in the overall specimen in fatigue
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Histograms to show the strain evolution and distribution of the localized deformation in the overall specimen. The curves correspond to the two-dimensional strain field images labeled with the same letter
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A surface crack in a strut of a foam that was subjected to cyclic loading, but before the occurrence of the abrupt strain jump. The foam specimen was tested at a stress ratio of 0.80 and stopped after 1.5×106 cycles.
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Surface cracks and deformation of struts within the seriously deformed shear band in a foam specimen that was tested and stopped after the occurrence of the abrupt strain jump: (a) a broken strut after a surface crack crosses through the strut, (b) an ongoing surface crack, and (c) plastic deformation induced by the ongoing surface crack. The foam specimen was tested at a stress ratio of 0.80 and stopped after the abrupt strain jump.
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Mixed striation and transgranular fatigue fracture modes: (a) a fatigue crack was initiated from corner A, and propagated towards corners B and C; (b), (c), and (d) display the details of the three corners A, B, and C, respectively, at higher magnifications; and (e) striations in the selected rectangular region in (d).




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