Reducing of holes effect on composite elements strength

Abstract

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 Effect of Hole Manufacturing Technology on the Strength of Orthogonally Reinforced Fibrous Composites

“…The authors have been interested in the influence of holes on the strength of orthogonally reinforced composites, previously [18,19] the enormous influence of holes on the bearing capacity of unidirectional composites have been shown, it is interesting to check whether this trend is also observed for an orthogonal reinforcement material.…”