Torsional stability of aluminum alloy seamless tubing

Moore, R L (Aluminum Company of America, New Kensington, Penn) Paul, D A (Aluminum Company of America, New Kensington, Penn)
naca-tn-696
March 1939


Torsion tests were made on 51ST aluminum-alloy seamless tubes having diameter-to-thickness ratios of from 77 to 139 and length-to-diameter ratios of from 1 to 60. The torsional strengths developed in the tubes which failed elastically (all tubes having lengths greater than 2 to 6 times the diameter) were in most cases within 10 percent of the value indicated by the theories of Donnel, Timoshenko, and Sturm, assuming a condition of simply supported ends.

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