Numerical calculation of stretch bending of narrow strip and analysis on spring back
Du Song1, Anatoly2, Chumadin2*
1. School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics�� Beijing 100083, China;
2. Department of Aircraft Production, Moscow State Aviation Technology University, Moscow 109240, Russia
To analyse stretch bending of narrow strip by numerical calculation, taking the loading history into account, the deformed zone was divided intomany elements to determine their strain by the condition that constant volume remains in deformation. Increment strain theory was applied to calculating 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 bend angle after springback were derived by considering the deformation after unloading. The simulative results show that stress distribution under stretching with superimposed bending is more advantageous to the reduction of spring back.