Features of tensile tests of composite reinforcement
In the introduction, the state of the issue is analyzed and the relevance of the research topic is shown. The aim of the work is to create a methodology for calculating estimates and recommendations for ensuring the equal strength of the structural elements of composite reinforcement during testing of mechanical properties for tensile. Settlement schemes are compiled and a comparative structural and mechanical analysis of the bearing capacity of composite reinforcement is performed according to the criteria of strength at break of the rod, as well as the shear strength of its polymer shell. The main contribution during the tests is made by the strength of the polymer shell in special couplings for gripping the samples, as well as the alignment of the samples and couplings during the tests. The results of comparative tensile tests for coaxial and non-coaxial samples are presented and analyzed, which made it possible to establish that the contribution of the bending moment when creating a stress state is comparable to the contribution from tension and can lead to a noticeable distortion of the experimental results. Recommendations are given on calculating the minimum required coupling length and on ensuring alignment of samples and couplings. In conclusion, conclusions on the work are formulated and it is noted that the results can be used by manufacturers and consumers of building composite reinforcement, as well as in the educational process, in preparing engineering personnel for the construction profile.