SYMPOSIA PAPER Published: 01 January 2002
STP10830S

Subsize Specimens for Fatigue Crack Growth Rate Testing of Metallic Materials

Source

In this work, the potential for obtaining reliable fatigue crack growth data from miniature notched bar specimens in three-point bend loading is examined. These specimens, at 2.0 mm wide by 0.8 mm thick by 7.9 mm long, are substantially smaller than any existing fatigue crack growth specimens. This work describes the development of subsize specimen fatigue crack growth rate test techniques using these miniature bar specimens. Fatigue crack growth data are reported for three alloys, 304L SS, Alloy 718 and Mod. 9Cr-1Mo steel. The data obtained using the subsize specimens compare favorably to crack growth rate data obtained on ASTM standard size specimens. The fracture surface microstructures of the subsize and standard size specimens are compared to show the similarities of the crack growth mechanisms in the two specimen configurations. Since three different materials were tested, it is possible to draw conclusions about the limitations of using these extremely small specimens in terms of material yield and ultimate strength and other standard tensile properties.

Author Information

Li, M
University of Illinois at Urbana-Champaign, 214 Nuclear Engineering Laboratory, Urbana, IL
Stubbins, JF
University of Illinois at Urbana-Champaign, 214 Nuclear Engineering Laboratory, Urbana, IL
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Details
Developed by Committee: E10
Pages: 321–335
DOI: 10.1520/STP10830S
ISBN-EB: 978-0-8031-5465-0
ISBN-13: 978-0-8031-2897-2