Stress-strain state of a steel rod reinforced with carbon fiber under the action of elevated temperatures

The article discusses the change in the mechanical properties of the adhesive layer and the carbon fiber plate when working together with a metal beam with a change in ambient temperatures; the effect of these changes on the mechanism of destruction, the ultimate load and stress distribution in a steel beam reinforced with a carbon fiber plate. The results were achieved using a finite element model of the beam, which takes into account the temperature dependence of changes in the adhesive and strength properties of the reinforced section. As a result of modeling, it was determined that sliding deformations were directly observed on the adhesive seam, which gives an idea of the effectiveness of hardening at elevated temperatures. Irreversible sliding deformation occurs along the adhesive joint before destruction due to the glass transition of the adhesive. Significant deformations were observed at a temperature of about 40°C, which is significantly lower than the glue glass transition temperature of about 65°C.