Reducing the effect of holes on the attachment points of composite elements is one of the key tasks from the time the composites appeared to the present. Since the composite material and the structure are inseparable, it is necessary to design the joints at the stage of manufacturing the structural element. The work is devoted to the experimental assessment of the effect of holes made by various technologies on the strength of composite specimen. A significant increase in the bearing capacity of composite flat specimen, holes in which are made by the separation of the fibers during the manufacturing. For fiberglass, the bearing capacity of a specimen with a drilled hole decreased by 4 times, and the specimen with fibers “flowing around” the hole by only 25% compared to a solid flat specimen.

The hole effect on the unidirectional composite specimen bearing capacity describes in the article describes. A comparison of the finite element calculation of the plates with holes made in various ways with experimental data is carried out. Good convergence of the FEM calculation and experimental data is shown.

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The results of the experimental study of machining effect on the fiberglass specimens’ tensile strength realization are presented. According to the data obtained, the size of the damaged zone, which does not carry applied loads and reduces the actual net cross-section of the specimen, has been estimated.