摘要
高强度钢因具有强度高、相同强度下质量更小的特点,成为目前车身及零部件上使用最多的材料。起皱、破裂是汽车覆盖件在弯曲成形及曲面翻边成形过程中的主要缺陷,而曲率是影响其成形性能的重要因素。为了预防起皱、破裂等缺陷,提高高强度钢的成形性能,利用数字图像相关(Digital Image Correlation,DIC)技术及Nakajima试验研究曲率对高强度钢成形极限的影响。以DP780高强度钢为试验材料,分别在不同直径的冲头下对其进行胀形试验,利用DIC技术实时监测板材的应变状态,通过位置相关法求得DP780在不同曲率下的成形极限曲线(Forming Limit Curves,FLC),并绘制各曲率下DP780板材的成形极限图(Forming Limit Diagrams,FLD)。通过对比各曲率下的FLC可知,DP780高强度钢板的成形性能随着曲率的增加而提高。
High-strength steel has become the most used material for body and parts because of its high strength and lighter weight under the same strength.Wrinkling and cracking are the main defects in the bending and flanging process of automobile cladding,and curvature is an important factor affecting its formability.In order to prevent wrinkling and cracking and improve the formability of high strength steel,Digital Image Correlation(DIC)technology and Nakajima test were used to study the influence of curvature on the forming limit of high strength steel.With DP780 high-strength steel as the test material,the expansion test was carried out under different diameters of punts.DIC technology was used to monitor the strain state of the plate in real time,and the Forming Limit Curves(FLC)of DP780 under different curvations were obtained by position correlation method.The Forming Limit Diagrams(FLD)of DP780 sheet under different curvatures were plotted.By comparing the FLC under different curvatures,it can be seen that the formability of DP780 high strength steel sheet increases with the increase of curvature.
作者
姚林晓
张晨阳
丁明明
林健
YAO Linxiao;ZHANG Chenyang;DING Mingming;LIN Jian(School of Mechanical Engineering,North China University of Water Resources and Electric Power,Zhengzhou 450000;College of Mechanical and Automotive Engineering,Zhejiang University of Water Resources and Electric Power,Hangzhou 310018;School of Mechanical Engineering,Ningxia University,Yinchuan 750021)
出处
《现代制造技术与装备》
2024年第3期10-12,26,共4页
Modern Manufacturing Technology and Equipment
