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根据板料成形过程的特点，提出一种用于板料成形分析的新单元模型——三维限制自由度单元模型，这种单元既没有膜单元不能考虑横向剪应力的遗憾，也不受壳单元对于局部大转角的限制，同时克服了体单元解决板壳结构问题时刚度矩阵奇异的缺点。通过实际计算和与实验结果的比较，证明了这种单元方案的合理性和正确性。
According to the characteristics of sheet metal forming process, a new unit model of three-dimensional finite element degree of freedom (DOF) model for sheet metal forming analysis is proposed. This unit has neither regret of lateral shear stress, nor shell element For the limitations of local large corner, at the same time overcome the body unit to solve the problem of structural rigidity of the stiffness matrix singular shortcomings. Through the actual calculation and comparison with the experimental results, the rationality and correctness of this unit scheme are proved.