Torsion tests were performed on aluminum alloy honeycomb sandwich panels of rectangular and triangular cross-sections. Shear flow distribution and torsional rigidity were measured and compared with theoretical results obtained by neglecting the core and by assuming the core behaves as a system of closely spaced spar webs. It is found that while the torsional rigidity obtained by neglecting the core is slightly conservative that the shear flows are seriously in error and may be non-conservative. The test results are in better agreement with the equivalent spar web theory than the theory neglecting the core. It is found that the torsional rigidity and the shear flows are sensitive to the configuration of the honeycomb core. (Author)
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