Deformation Analysis of Engineering Reinforcement Straightening Based on Bauschinger Effect

Abstract

The Bauschinger effect is an important factor in metal forming process. Reinforcement straightening is a type of metal plastic forming processes, and it is theoretically influenced by the Bauschinger effect. However, in the field of steel straightening technology, there is no study on the existence and influence of Bauschinger effect in the straightening process of steel bars. This study adopts the method of combining experiment with finite element simulation analysis. Firstly, based on the steel straightener, the HRB400E steel bar specimens were loaded forward and backward by adding tension pressure sensors and strain gauges, and the data were collected and analyzed. Finally, the exact constitutive parameters of reinforcing bar material are obtained through the tensile test of reinforcing bar, and the properties of reinforcing bar material are set by using the parameters combined with the multi-linear kinematic hardening model, so that the real simulation material model can be obtained. Experimental and simulation results both show that the yield limit of the reinforcement that is produced by plastic bending decreases noticeably during repeated reverse loading, moreover, the yield limit only decreases once in the subsequent reverse loading process. The study concludes that the Bauschinger effect exists in the straightening process of steel bars. Through the study, the existence and influence of Bauschinger effect should be fully considered and studied in the process of theoretical research and application of steel straightening, and at the same time, the reference basis for improving the accuracy and quality of steel straightening should be provided.