SYMPOSIA PAPER
Published:
01 January 1980
STP36963S
Fractographic Measurements of Crack-Tip Closure
SourceRelative changes in striation spacing resulting from a sudden change of the load range were used to measure crack-tip closure under plane-strain conditions. The tests were performed in a 2124-T351 aluminum alloy. The difference between the opening and closure rates of the crack tip was quantitatively measured by comparing striation spacings for two different programmed load blocks. It is concluded that crack-tip closure occurs principally in the plane-stress region of the crack front. In the center of the specimen, under plane strain, the average value of Kop/Kmax is less than 0.20 for ΔK varying from 10 to 35 MPa√m.
Author Information
Pelloux, RM
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Mass.
Faral, M
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Mass.
McGee, WM
Engineering Structures and Materials Laboratory, Lockheed-Georgia Co., Marietta, Ga.
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Details
Developed by Committee: E08
Pages: 35–48
DOI: 10.1520/STP36963S
ISBN-EB: 978-0-8031-4770-6
ISBN-13: 978-0-8031-0363-4