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采用三维弹塑性有限元法对比分析了均壁管和非均壁管的空拔过程。模拟结果表明 ,空拔的均壁作用主要体现在外壁直径的均匀化上 ,内壁直径波动虽然也有所减小 ,但减小的幅度并不大 ;壁厚的波动不是造成拉拔力波动的主要因素 ,但壁厚的波动对变形区应力场有重要影响 ,并可显著影响残余应力的分布
The three-dimensional elasto-plastic finite element method was used to compare and analyze the air-drawing process of the pipe wall and the pipe wall. The simulation results show that the average wall effect of airspeed is mainly reflected in the homogenization of the outer wall diameter, although the diameter fluctuation of the inner wall is reduced, but the amplitude of the decrease is not large; the fluctuation of the wall thickness is not the main cause of the fluctuation of the drawing force However, the fluctuation of wall thickness has an important influence on the stress field in the deformation zone and can significantly affect the distribution of residual stress