摘要
基于韧性断裂准则,预测了单筋条试件和多筋条试件多点压弯成形中的断裂位置和启裂时刻,并进行了多点压弯实验。对比分析结果显示:预测的试件断裂位置与实验基本一致,启裂时刻对应的上模临界下压量与实验相比,误差在10%以内。分析了不同筋条试件多点成形中断裂产生的原因,针对腹板在变形量过大时易出现断裂、难成形的问题,提出了整体壁板试件多道次成形方法。仿真结果显示,多道次多点成形能抑制壁板断裂。
In this paper,fracture position and fracture moment on single stiffener and multi-stiffener workpieces were predicted using finite element method based on fracture ductile criterion,and multipoint press bending experiments were conducted.It is found that the predicted fracture position is consistent with that of the experiments.The error of punch displacement at fracture moment is less than 10% compared with experimental results.The fracture reason of different stiffeners were analyzed based on the ductile fracture mechanics.To solve the problem that the web is easily to fracture when deformation is large,a multi-step forming method was proposed.Simulation results show that the proposed method can restrain the fracture on integral panel workpiece.
作者
刘纯国
崔琪
岳韬
李东来
LIU Chun-guo;CUI Qi;YUE Tao;LI Dong-lai(Roll-forging Research Institute,Jilin University,Changchun 130022,China)
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2019年第2期513-520,共8页
Journal of Jilin University:Engineering and Technology Edition
基金
国家自然科学基金项目(51575231)
关键词
材料合成与加工工艺
铝合金整体壁板
多点成形
韧性断裂
materials synthesis and processing technology
Al integral panel
multi-point forming
ductile fracture
