| Summary: | This paper presents an experimental investigation of 6061-T6 and 5050-H32 aluminum alloy rods and bars subjected to pure torsional loading. The test plan included five sets of 6061-T6 specimens, with solid circular and rectangular cross-sections, and four sets of 5050-H32 specimens, with solid rectangular cross-sections. Each series included six specimens, for a total of 54 tests. Resulting torque and angular twist data were used to estimate the torsional stiffness and strength, including the initial yield, full yield, and ultimate strengths. Experimental results were compared with values computed using the Aluminum Association’s <i>Specification for Aluminum Structures</i> (SAS) design rules. SAS provisions were found to be overly conservative, supporting the importance of investigating changes towards an ultimate strength approach that is consistent with a limit states design specification.
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