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Torsional Stability of Aluminum Alloy Seamless Tubing

Torsional Stability of Aluminum Alloy Seamless Tubing


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Torsion tests were made on 51ST aluminum-alloy seam- less 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 Donnell, Timoshenko, and Sturm, assuming a condition of simply sup- ported ends.


In the design of aircraft, lightweight trains, tanks, and pipe lines, problems involving the strength of thin curvilinear sections subjected to shear are frequently encountered. The strength in such cases is more often de- pendent upon the stability of the section than upon the strength of the material of which it is composed, and so-' lutions are necessarily based upon the results of both tests and theoretical analyses. A study of the torsional strength of thin-wall cylindrical sections covers the sim- plest case of the general problem and, for that reason, this type of section has been the field for numerous investigations. It is the purpose of this report to present additional experimental data, obtained from aluminum-alloy seamless tubes, and to compare the test results with several of the existing theories of torsional stability.