VARIOUS METHODS OF ANALYSIS OF SANDWICH PLATES WITH BENDING AND THEIR COMPARISON BY EXPERIMENT.
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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The basic calculated values of a sandwich panel and the character of state of strain in the filler depend on the two basic parameters theta sub 1 and theta sub 2. 1 Under the condition that theta sub 2 nu sub 2 is clearly fulfilled when theta sub 2 or 3500, bucklings calculated by the different methods are scarcely distinguished among themselves, irrespective of support conditions. With a smaller value of theta sub 2 and various conditions of external layer support, bucklings are described best of all by the solution based on the assumption E sub xx 0 second method. 2 It is possible to determine the approximate values of direct stresses in the sheathing, with elastic deformations in a wide range of basic parameter values, by the standard beam formulas of strength of materials for a hollow beam. 3 The distribution of direct sigma sub 2 and tangential stresses along the height of the filler, both by exact solution and experimentally, confirms the applicability of the second method based on the assumption E sub xx 0. The theoretical distribution of sigma sub 2 along the length of the filler, calculated by the shown method, and also the magnitude of its maximum value satisfactorily coincide with the experiment. This means that the state of strain in the filler best of all describes the solution obtained by the second method. 4 For clarifying the supporting power of a sandwich plate under prolonged loading, it is necessary to consider highly elastic deformation in the sheathing. Author
- Structural Engineering and Building Technology