基于静态三点弯曲超高强钢硬化行为模型分析  

Model analysis on hardening behavior of ultra high strength steel based on static three-point bending

作　　者：李倩倩 孙雪丽 吕宝占 LI Qian-qian;SUN Xue-li;L Bao-zhan(College of Automotive Engineering,Huanghe Jiaotong University,Jiaozuo 454950,China)

机构地区：[1]黄河交通学院汽车工程学院,河南焦作454950

出　　处：《塑性工程学报》2024年第3期100-106,共7页Journal of Plasticity Engineering

基　　金：河南省焦作市科研所大型仪器设备共享机制研究项目(JZZ2020055)。

摘　　要：选取HC700/980DHD+Z、 HC780/980CPD+Z和HC700/980DPD+Z进行分析,对比了3种材料力学性能和极限冷弯性能的差异;基于5种硬化模型对材料性能曲线进行拟合,选取两类拟合度较高的模型构建了组合硬化模型,并采用R5缺口拉伸试验进行了验证;基于前防撞梁静态三点弯曲测试和仿真对标分析,对组合硬化模型进行验证,并对3种材料的承载性能进行对比分析。结果表明:HC700/980DHD+Z和HC780/980CPD+Z的极限冷弯角分别为109.8°和109.6°,优于HC700/980DPD+Z;前纵梁静态三点弯曲试验测试与仿真分析中关键参数的最大误差在6%左右,表明材料本构模型的精度较高;HC780/980CPD+Z的承载力峰值最大,达到15.1 k N;HC700/980DHD+Z达到承载力峰值的位移最大,达到52 mm;屈强比对静态承载过程的峰值力产生重要影响,而断后伸长率的增加提升了材料的强塑积和塑性应变变形,使得承载力峰值的位移增大。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 R 5 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 analyzed.The results show that the ultimate cold bending angles of HC700/980DHD+Z and HC780/980CPD+Z are 109.8°and 109.6°respectively,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 material,resulting in the increase of the displacement of the peak bearing capacity.

关 键 词：超高强钢 极限冷弯 硬化行为 本构模型 三点弯曲 

分 类 号：TG146.2[一般工业技术—材料科学与工程] U465.22[金属学及工艺—金属材料]