摘要
基于塑性本构关系和Hosfrod屈服准则,当拼焊板焊缝及热影响区金属的弹塑性力学性能已知时,提出一种获得拼焊板成形极限图的理论计算方法。建立获取拼焊板成形极限图的半球凸模胀形物理实验模型,并将物理实验结果与理论计算结果进行对比分析。研究结果表明:拼焊板及其母材成形极限图的理论计算结果与物理实验结果吻合较好;拼焊板的成形极限明显低于母材,说明拼焊板与母材相比,成形性能降低。该理论计算模型为快速准确获得拼焊板的成形极限图提供了一种方法。
Based on the elastoplastic mechanical properties of the weld and heat affected zone metals obtained by a nanoindentation test, a theoretical calculation model was established for the forming limit diagram（FLD） of tailor-welded blanks（TWBs） on the basis of plastic constitutive relations and Hosford yield criteria. Hemispherical punch bulging tests were performed to verify the FLD theoretical calculation results. The results demonstrated that not only the FLD theoretical calculation of base materials but also that of TWBs had a good agreement with their experiments. Besides, poorer formability of TWBs caused its FLD significantly lower than that of base materials. The theoretical calculation model offers a reliable approach to obtain the specific FLD of TWBs.
基金
Project(51275444) supported by the National Natural Science Foundation of China
Project(20121333110003) supported by the Specialized Research Fund for the Doctoral Program of Higher Education,China
Project(E2014203271) supported by the Natural Science Foundation–Steel and Iron Foundation of Hebei Province
China
关键词
拼焊板
成形极限图
纳米压痕实验
半球凸模胀形实验
tailor-welded blank
forming limit diagram
nanoindentation test
hemispherical punch bulging test
