考虑成卷-展平过程的冷弯残余应力分析

发布时间：2018-06-02 00:20

本文选题：成卷 + 残余应力　；参考：《钢铁》2017年05期

【摘要】：从不考虑材料冷作硬化(理想弹塑性体)与考虑冷作硬化(双线性随动硬化)两个方面对带坯在成卷、开卷、展平、塑性弯曲及回弹过程中产生的应力进行了解析分析,获得了冷弯残余应力沿厚度方向上的分布,随后对比研究了考虑硬化与不考虑硬化对冷弯残余应力分布的影响,并将理论计算结果与实测残余应力进行了对比。结果表明,理想弹塑性模型和硬化模型预测的残余应力分布形式几乎一致;成卷上存在屈服时,纵向残余应力由内外表面向板厚中心方向呈非线性分布(成卷上无屈服时呈线性分布),横向残余应力呈近似线性分布;在变形外区主要为残余拉应力(横向残余应力在外侧有极小部分受压区),内区主要为残余压应力(横向残余应力在内侧有极小部分受拉区);横、纵向残余应力最大值均在中性层位置;研究结果与试验测量结果基本一致。
[Abstract]:In this paper, the stress produced in the process of coiling, unwinding, flattening, plastic bending and springback is analytically analyzed from two aspects of cold work hardening (ideal elastoplastic body) and cold work hardening (bilinear following hardening), which do not consider the material cold work hardening (ideal elastoplastic body), in the process of forming, unwinding, flattening, plastic bending and springback. The distribution of cold bending residual stress along the thickness direction is obtained. Then the influence of hardening and not considering hardening on the distribution of cold bending residual stress is studied, and the theoretical results are compared with the measured residual stress. The results show that the distributions of residual stress predicted by the ideal elastic-plastic model and the hardening model are almost the same, and when there is yield on the roll, The longitudinal residual stress is nonlinearly distributed in the direction of the inner surface facing the thick center of the plate (linear distribution when there is no yield on the roll and approximately linear distribution of the transverse residual stress). In the outer region of deformation, the main residual tensile stress is residual tensile stress (lateral residual stress has a very small part of compressive area on the lateral side, and the inner region is mainly of residual compressive stress (transverse residual stress has a very small part of tensile zone on the inside; transverse, the lateral residual stress has a very small part in the inner part of the tension zone; The maximum values of longitudinal residual stress are in the neutral layer, and the results are in good agreement with the experimental results.
【作者单位】：武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室;
【基金】：省部共建耐火材料与冶金国家重点实验室青年基金资助项目(2014QN03)
【分类号】：TG301

【相似文献】