An Experimental Study of Three-Layer Beams with Discrete Pyramidal Filler

To increase the resistance to the action of concentrated dynamic forces, the authors propose to use fibrous material as the middle layer of a three-layer structure. However, such material does not provide the necessary rigidity of the structure under static loads.  To increase the rigidity, it is proposed to use discrete filler in the shape of a pyramid; in doing so, it is necessary to determine the impact of static loads on the bearing capacity of the sandwich structure when the pyramidal filler is used. The three-layer beams with pyramidal filler were studied for transverse bending with hinge- and rigid-edge fixing. The beams were subjected to an evenly distributed load using special devices and attachments. The load varied within the elastic zone of the three-layer beam, i.e. the residual deformation was not observed after removing the load. Simultaneously, the beam edge displacement and the distance between the bearing layers were measured. The paper presents experimental values of the stresses appearing in the top bearing layer and of the displacements of the three-layer beam with pyramidal aluminum foil and D-19 alloy filler at transverse bending of the beam.  The theoretical and the experimental data is compared.

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