SYMPOSIA PAPER Published: 01 January 1984
STP34431S

Studies of Stress Corrosion Crack Growth in Al-Zn-Mg Alloys by the Double Torsion Method

Source

The double torsion test specimen was evaluated to determine if it was suitable for use in subcritical crack growth studies of ductile engineering alloys. Several attractive features of the double torsion specimen were observed, including a simple, crack-length-independent expression for stress intensity and the apparent retention of plane-strain conditions in relatively thin plate specimens. Use of the double torsion specimen to determine V-K curves for high-strength aluminum alloys in a chloride environment produced conventional two-stage growth, plateau velocities being slightly higher than those observed in similar tests using conventional plan strain specimens. The double torsion specimen appears attractive for subcritical crack growth studies under plane-strain conditions, particularly in the Stage II regime where crack velocities are not strongly dependent on stress intensity.

Author Information

Bond, TL
Caterpillar Tractor Company, East Peoria, Ill.
Yeske, RA
Institute of Paper Chemistry, Appleton, Wisc.
Pugh, EN
National Bureau of Standards, Gaithersburg, Md.
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Details
Developed by Committee: G01
Pages: 128–149
DOI: 10.1520/STP34431S
ISBN-EB: 978-0-8031-4894-9
ISBN-13: 978-0-8031-0264-4