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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.
stress corrosion, crack growth, double torsion, aluminum alloys, chloride
Development Engineer, Caterpillar Tractor Company, East Peoria, Ill.
Senior Research Associate, Institute of Paper Chemistry, Appleton, Wisc.
Group Leader, National Bureau of Standards, Gaithersburg, Md.