Abstract:

A finite element model of stretch forming was established based on distributed displacement loading and the displacement loading trajectory of forming the three-dimensional surface was designed. Spherical parts and saddle parts were selected for simulation, the effects of the number of discrete loading points and loading time-steps on the stress and strain distribution on the formed part were analyzed comparatively. Results show that the more discrete loading points, the higher uniformity of the strain distribution and the better forming quality; and the more loading time-steps, the smaller variation of the stress magnitude and the better forming quality. However, when the loading time-step reaches a certain value, there were no obvious changes in the stress and strain distributions with further increase in the loading time-step. Experiment results demonstrate to feasibility of proposed displacement loading method.

Key words: materials synthesis and processing technology, stretch forming, distributed displacement loading, loading trajectory, numerical simulation