The Effect of Test Machine Extensional Rigidity on the Initial Buckling Load of Unreinforced Circular Cylindrical Shells in Axial Compression.

摘要

The inadequacy of small displacement theory of thin shells in explaining the buckling of circular cylindrical shells has been established. Likewise, it has become general belief that an explanation can be given by means of a nonlinear large deflection theory. The current theories lean heavily upon a plausible but arbitrarily chosen energy criterion first given by Tsien, and predict that the initial buckling load should be influenced by the testing machine stiffness. Two experiments described, statistically analyzed, and discussed by the authors in a previous paper revealed that test machine extensional rigidity does not influence the initial failing load. These results were obtained from repeated tests on a single near-perfect aluminum specimen and individual tests on many less perfect steel shells. They had R/t ratios of 313 and 226, respectively, and buckled at 77 and 45 percent of the classical critical load. (Author)