Abstract

The interlayer carbon/glass hybrid rod has a bottleneck of rod splitting and delamination, which significantly impacts the reliability of sucker rod. Therefore, according to the design scheme of intralayer carbon/glass hybrid rods, a full-scale simulation model was developed to investigate the impact of various material design parameters on the tensile strength of intralayer carbon/glass hybrid rods. By using the Genetic agorithm-Back propagation (GA-BP) method, the correlation between material component parameters at the mesoscale level and the mechanical characteristics of composite rods at the macroscale level was declared. The optimization strategy for high-strength carbon/glass composite rods was novelty proposed. The results indicated that: (1) In the optimized carbon fiber rod, the volume content of carbon fiber was 72%, the volume content of glass fiber was 80%, the elastic modulus of carbon fiber was 210 GPa, the elastic modulus of glass fiber was 78 GPa, and the elastic modulus of epoxy resin as 2.6 GPa; (2) the order of significance of the effects on the intralayer carbon/glass hybrid rod, from high to low, was as follows: volume content of glass fiber(56.8) > elastic modulus of epoxy(-35.7) > elastic modulus of carbon fiber(-17.8) > volume content of carbon fiber(6.0) > elastic modulus of glass fiber(3.3); (3) the experimental tensile strength of the optimized intralayer hybrid rod was 1356.5 MPa. The research is of great significance to improve the reliability of carbon/glass hybrid rod pumping systems in oil and gas fields.