韧性断裂准则在超高强钢辊弯成形工艺中的应用  

Research on application of ductile fracture criteria in roll forming process of ultra high strength steel

作　　者：王在林[1] 韩飞[1] 刘继英[1] 艾正青[1] 

机构地区：[1]北方工业大学机电工程学院,北京100144

出　　处：《塑性工程学报》2012年第4期16-20,共5页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51074204);北京市自然科学基金资助项目(3112010);北京市中青年骨干人才培养计划资助项目(PHR20110851);国家自然科学基金国际(地区)合作与交流资助项目(51110105010)

摘　　要：对某牌号的超高强钢进行拉伸、弯曲、V型件辊弯成形试验,对比常用的6种韧性断裂准则,得出这6种韧性断裂准则均不能给出一个适用于板料各种工艺下断裂的固定临界值。根据辊弯成形工艺特点,采用Brozzo韧性断裂准则,预测相对弯曲半径R/T=2下的超高强钢辊弯成形的破裂现象。预测结果与实验结果表明,Brozzo韧性断裂准则可以应用于超高强钢辊弯成形中。Ultra high strength steel（UHSS） has been used widely in automotive industry,and roll forming process is one of the effective forming technologies to produce UHSS profiled parts.This research conducted uniaxial tensile test,bending test and roll forming test,compared six kinds of ductile fracture criteria,and concluded that the six ductile fracture criteria could not provide a cracking critical value suitable for all kinds of sheet metal forming processes.According to the characteristics of roll forming process,Brozzo ductile fracture criterion was adopted to predict the fracture with the relative bending radius R/T=2 in the UHSS roll forming simulation.The simulation result agreed with the experimental result,which proved Brozzo ductile fracture criterion could be applied to UHSS roll forming process.

关 键 词：辊弯成形 韧性断裂准则 超高强钢 有限元 

分 类 号：TG335.4[金属学及工艺—金属压力加工]