Abstract
This paper develops a novel approach for testing cylindrical shells. A method of buckle restriction by means of an internal mandrel is used. This mandrel is located at a distance equivalent to the thickness of the shell from the surface of the test specimen. By means of this device it is possible to elastically buckle the shell until the shell is completely filled with buckles. It is shown that the variation of the rate of change in number of buckles as a function of the applied load follows a Gaussian distribution. The mode of the Gaussian curve is located at a load level which agrees very closely with the critical buckling load computed from the classic formula.It is considered that the evidence presented is substantial support for the small displacement theory and a strong indication that buckling takes place first at the weakest section of the shell and the amount of buckling is a function of the area of weakness.
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