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A brief outline of development in the field of metal-adhesive bonding in postwar Germany precedes some of the results of recent research, Particular emphasis is put on the authors work with Special attention given to nonlinear stress-strain relationships of the adhesive, the Specific shape of which hag certain effects on the stress distribution in the glue line of a lapshear bond. A change in the test temperature helps to clarify this as does the crack pattern on the surface of the broken specimen. The influence of the degree of polymerization of an adhesive has been investigated with respect to characteristics of a loaded lap-shear bond. The results were correlatable to those obtained from east film specimens. Creep exhibited by small lap-shear bonds occurred principally in the came way in bonded aluminum beams. Creep in statically loaded lap-shear bonds is dependent on the stress distribution in the glue line. By varying the applied loads and the glue-line thicknesses, the stress distribution could be found to depend upon elapsed time.
Hahn, Karl F.
Research Engineer, Douglas Aircraft Co., santa Moniea, Calif.