Abstract
A technique for producing accurate models is described. The models were subjected to internal pressure and the displacements of points on the outer surface were measured with a travelling microscope. From these measurements the radii of curvature and the rotation of the elements were determined graphically and the bending moments calculated.
The greatest bending moments were found to be proportional to the percentage increase in head height and almost independent of Poisson's ratio of the material except for the change in flexural rigidity. The effect of large strains on the bending moments in any drum head can therefore be calculated if the relation between increase in head height and pressure has been determined and the bending moments for one pressure are known.
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