Investigation of the processes of deformation of glass-reinforced plastics with a stress concentrator using the theory of critical distances

Abstract

In the course of the work, a series of tensile tests were carried out on flat samples of STEF structural fiberglass for electrical purposes. In addition to the experiment, numerical simulation of the tensile processes of these samples was carried out. The studied samples were strips without stress concentrators and with a concentrator in the form of V-shaped cuts with different rounding radii at the top of the concentrator and the depth of the cut. The results obtained were used to determine the material constants according to the theory of critical distances. Two approaches of the theory of critical distances were used: linear and point. To analyze the experimental results, finite element models were built using the ANSYS software package and numerical simulation was carried out, which resulted in the obtained linearized maximum principal stresses on the central line passing through the top of the stress concentrator. Based on the results of the work, the values of the critical distances of the composite were determined, obtained using the point and linear methods and the finite element method. The results obtained can be used to predict the strength characteristics of real products with complex geometry, as well as damaged structural elements.