Matematický popis fenoménu transverzálního praskání v CFRP laminátových deskách

Abstract

This paper focuses on the analysis and comparison of analytical models for calculating the stress field and strain field in 0/90/90/0 composite laminates with a crack in the 90° ply. For this purpose, a parabolic model, a variational model, and a progressive shear model were selected. An extensive parametric study analyzes the behavior of the mentioned models for a specific [0/90] laminate configuration and crack density, using results obtained by the finite element method (FEM) as reference values. The results indicate the suitability of the progressive shear model and the variational approach, which better describe the stress field in the 0° layer. The stress distribution in the 90° layer is better described by a parabolic model. The paper describes the areas of applicability of various models for selected combinations of parameters, describing the degree of damage to the transverse layer and the composite configuration. The paper also includes a methodology for the experimental determination of the mechanical properties of the investigated composite material.