窄板拉弯成形的数值分析与回弹计算  

Numerical calculation of stretch bending of narrow strip and analysis on spring back

作　　者：杜颂[1] Anatoly Chumadin 

机构地区：[1]北京航空航天大学机械工程及自动化学院,北京100083 [2]俄罗斯国立技术大学飞行器制造系,莫斯科109240

出　　处：《北京航空航天大学学报》2004年第9期863-867,共5页Journal of Beijing University of Aeronautics and Astronautics

摘　　要：在考虑加载历史的情况下 ,为采用数值方法研究窄板拉弯成形 ,将变形区划分成若干个单元 ,按塑性变形体积不变条件 ,确定单元应变 .利用增量理论 ,由差分方程算出应力分布 ,并分析了加载历史对其影响 .依据卸载变形的分析计算 ,推导出回弹后中性层弯曲半径及弯曲角变化量的计算公式 .计算结果表明 。To analyse stretch bending of narrow strip by numerical calculation, taking the loading history into account, the deformed zone was divided into many elements to determine their strain by the condition that constant volume remains in deformation. Increment strain theory was applied to calculate the stress distribution from difference equation and the effect of loading history on them was discussed. The formulae for calculating the bend radius of neutral plane and the decrement of bending angle after resilience were derived by considering the deformation after unloading. The simulation results show that stress distribution under stretching with superimposed bending is more advantageous to the reduction of resilience.

关 键 词：弯曲 数值计算 残余应力 回弹 

分 类 号：TG386[金属学及工艺—金属压力加工]