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Adhesive bonded sandwich construction has proved to be a most efficient structure. The efficiency is unsurpassed for panel type construction in which the core stabilizes the faces, permitting the faces to be stressed up to their full material capabilities. However, the details of the panels, that is, the segments other than the face-to-core construction, tend to limit the efficiency of the bonded sandwich panel with respect to an optimum weight. All loads must be put into, or taken out of, the panels through the edge or insert details, and it is these features that account for much of the total weight of the panels. Mathematical methods have been offered by Volkerson (1), Goland and Reissner (2), and DeBruyne (3) for the analysis of bonded lap joints. Attempts to substantiate the resulting solutions have been only partially successful. The latest efforts at the U. S. Forest Products LABORATORY have shown also that as yet there is no reasonable method for the analysis of bonded joints Two features of bonded details should be considered in defining an analytical method; the elastic behavior of the elements within the detail, and the maximum strength capabilities of the detail itself. The latter feature could include the strength capabilities of the several elements within the detail. It is the limiting strength or behavior of one of these elements which establishes the maximum strength of the whole detail. The elastic behavior can be studied empirically by the use of suitable strain measuring devices and by direct observation of details under stress. Likewise, maximum strength behavior can be investigated by tests in which the details are loaded to destruction. A sufficient understanding of test data would permit the development of proper assumptions. These assumptions would lead to a suitable theory or approximation for rational analysis of bonded details.
Sheridan, M. L.
Associate Professor of Civil EngineeringDesign Specialist, Bucknell UniversityGlenn L. Martin Co., LewisburgBaltimore, Pa.Md.
Merriman, H. R.
Staff, Materials Engineering, Glenn L. Martin Co., Baltimore, Md.