|
摘要：
|
|
为了对先进高强钢边部成形失效进行准确预测，采取试验和仿真相结合的方式，基于DIC方法开展圆柱凸模扩孔试验，采用Dynaform软件，基于3种断裂失效判据对先进高强钢DP980材料的边部成形极限进行仿真预测，并与试验结果进行比较。结果表明：DIC方法可以准确获得扩孔极限状态，并在线获得扩孔率，可提高扩孔率测量效率和准确性；采用Swift等向强化模型和Hill1948屈服模型预测的扩孔时的主、次应变分布，沿轧制方向与试验结果较为接近，但沿横向仍存在一定差异；进一步比较扩孔率数据，采用最大失效应变判据，扩孔率预测结果与试验更为接近，采用传统的FLC曲线进行预测，与试验结果偏差较大，不能作为边部失效的有效判据。
|
|
In order to precisely predict edge forming failure of advanced high strength steels, the method of combining for experiment and simulation was adopted, and the cylindrical punch hole expanding test was conducted based on DIC method. Then, the edge forming limit of advanced high strength steel DP980 material was simulated and predicted by software Dynaform based on three fracture failure criteria, and the simulation results were compared with test results. The results show that the limit state of hole expanding is obtained accurately by DIC method, and the hole expansion rate is gained online to improve the efficiency and accuracy of measurement for the hole expansion ratio greatly. Then, the distributions of major and minor strains for hole expanding predicted by Swift isotropic strengthen model and Hill1948 yield model are close to the test results along the rolling direction, but there are some differences along the transverse direction. Furthermore, the data of hole expansion ratio are compared, the predicted hole expansion ratio is close to the test result by the maximum failure strain criterion, and the predicted result using the traditional FLC curve deviates greatly from the test result, so the traditional FLC curve cannot be used as an effective criterion for edge forming failure.
|
|
基金项目：
|
|
国家重点研发计划项目（2017YFB0304403）
|
|
作者简介：
|
|
赵广涛（1986-），男，硕士，工程师，E-mail：zhaoguangtao@baosteel.com
|
|
参考文献：
|
[1]钟茂莲. 高强度汽车钢板冲压成形的主要问题及模具对策[J]. 精密成形工程, 2014, 6(3)：20-24.
Zhong M L. Key problems of highstrength steel in stamping forming process and corresponding die countermeasures[J]. Journal of Netshape Forming Engineering，2014，6(3): 20-24.
[2]朱久发. 高强度钢板在汽车车身上的应用及问题对策[J]. 武钢技术，2007,45(2):43-46.
Zhu J F. Problems encountered in application of high strength steel plates or sheets for automobile body and its countermeasures[J]. Wuhan Iron and Steel Corporation Technology, 2007，45(2): 43-46.
[3]张旭, 周杰. 高强度钢后保险杠成形工艺优化及回弹控制[J]. 热加工工艺, 2010,39(5):102-105.
Zhang X, Zhou J. Optimization and springback control of rear bumper forming process[J]. Hot Working Technology, 2010，39(5):102-105.
[4]马晓春， 沈卫兵. 有限元数值模拟技术在汽车冲压件成形中的应用[J]. 浙江工业大学学报，2007,35(1)：100-104.
Ma X C, Shen W B. Application of numerical simulation of finite element in molding process of automobile pressing parts[J]. Journal of Zhejiang University of Technology, 2007,35(1)：100-104.
[5]刘维, 梅龙, 褚兴荣. 金属板料高速率拉伸试验及其硬化模型的综述[J]. 精密成形工程, 2016, 8(2): 30-36.
Liu W, Mei L, Chu X R. Review of tensile tests at high strain rates and hardening models of sheet metal[J]. Journal of Netshape Forming Engineering, 2016, 8(2): 30-36.
[6]谭海林， 郭照宇，孟少明. 基于Dynaform的高强钢板冲压回弹补偿分析[J]. 锻压装备与制造技术，2014,49(4):65-67.
Tan H L, Guo Z Y, Meng S M. The analysis of stamping spring back compensation for high strength steel based on Dynaform [J]. China Metalforming Equipment & Manufacturing Technology, 2014, 49(4):65-67.
[7]GB/T 228.1—2010，金属材料拉伸试验第1部分：室温试验方法[S].
GB/T 228.1—2010，Metallic materials—Tensile testing—Part 1: Method of test at room temperature [S].
[8]臧顺来. 薄板弹塑性本构模型及冲压回弹研究[D]. 西安：西安交通大学，2007.
Zang S L. Research on Elastoplastic Constitutive Model and Sheet Springback[D]. Xi′an: Xi′an Jiaotong University, 2007.
[9]蒋浩民, 陈新平, 石磊，等. 先进高强度钢板的冲压成形特性及其应用[J]. 塑性工程学报, 2009, 16(4): 183-186.
Jiang H M, Chen X P, Shi L, et al. Forming characteristics and application of advanced high strength steel [J]. Journal of Plasticity Engineering, 2009, 16(4): 183-186.
[10]GB/T 15825.4—2008, 金属薄板成形性能与试验方法第4部分：扩孔试验[S].
GB/T 15825.4—2008, Sheet metal formability and test methods—Part 4: Method of hole expanding test [S].
[11]葛德龙. 超高强度钢冷弯特性和回弹的实验研究与数值仿真[D]. 上海：上海交通大学，2014.
Ge D L. Experimental Research and Numerical Simulation on Cold Bending and Springback Characteristics of Ultrahigh Strength Steel[D]. Shanghai: Shanghai Jiao Tong University,2014.
[12]Kim H, Shang J, Dykeman J, et al. Practical evaluation and prediction of edge cracking in forming advanced high strength steels (AHSS)[A]. WCXTM 17: SAE World Congress Experience[C]. Detroit, 2017.
[13]Min J, Stoughton T B, Carsley J E，et al. A method of detecting the onset of localized necking based on surface geometry measurements[J]. Experimental Mechanics, 2017,57:521-535.
[14]李永好, 胡启, 李细锋, 等.切割工艺对超高强度钢边部质量及成形性能影响的试验研究[J]. 塑性工程学报, 2019, 26(3):41-48.
Li Y H, Hu Q, Li X F, et al. Experimental research on the influence of cutting process on the edge quality and formability of ultrahigh strength steel [J]. Journal of Plasticity Engineering, 2019, 26(3):41-48.
[15]Paul S K, Mukherjee M, Kundu S, et al. Prediction of hole expansion ratio for automotive grade steels[J]. Computational Materials Science, 2014, 89:189-197.
|
|
服务与反馈：
|
|
【本网站尚未开通全文下载服务】【加入收藏】
|
|
|
|
