Modeling of Process of Originating Holes in Composite Constructions by Method of Puncturing Non-solidified Polymer Fibrous Material

A model of originating holes by a sharp rod (indenter) in non-solidified polymer fibrous material with long-cross reinforcement pattern is considered. Shift displacements of fibers occur in each layer under the local load perpendicular to the multi-layer packet plane. Analytical dependences are obtained that allow describing a shape and stretch of irregularity of the orthotropic material regular structure, the reinforcement coefficient change and the stress state of the laminated material in the vicinity of punctured holes. Results of experiments on puncturing cylindrical holes in non-solidified composite materials are presented.