Model analysis on hardening behavior of ultra high strength steel based on static three-point bending
HC700/980DHD+Z,HC780/980CPD+Z and HC700/980DPD+Z were selected for analysis,and the difference in mechanical properties and ultimate cold bending properties of the three materials was compared.Two material properties curves were fitted based on five kinds of hardening models.The models with high fitting degree were selected to construct a combined hardening model,which was verified by using R5 notch tension test.Based on the static three-point bending test and simulation benchmarked analysis of the front anti-collision beam,the combined hardening model was verified,and the load bearing properties of the three materials were compared and ana-lyzed.The results show that the ultimate cold bending angles of HC700/980DHD+Z and HC780/980CPD+Z are 109.8° and 109.6° re-spectively,which are superior to that of HC700/980DPD+Z.The maximum error of key parameters in the static three-point bending test and simulation analysis of the front longitudinal beam is about 6％,indicating that the accuracy of material constitutive model is high.The peak bearing capacity of HC780/980CPD+Z is the largest,reaching 15.1 kN.The displacement of HC700/980DHD+Z reaching the peak bearing capacity is the largest,reaching 52 mm.The yield ratio has an important impact on the peak force during the static load bearing process.However,the increase of elongation after fracture increases the strength plastic product and plastic strain deformation of the mate-rial,resulting in the increase of the displacement of the peak bearing capacity.
ultra high strength steelultimate cold bendinghardening behaviorconstitutive modelthree-point bending
万方数据
维普
