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摘要：
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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。
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A new restricted-freedom element model is proposed, which is to avoid the disadvantageof the absence of the transverse shear stresses in membrane elements, the failure when large local rota-tion occurred in shell elements, and the ill-conditioned equations while using three-dimensional solid ele-ments. The validity is examined by compare the theoretically calculated results with the experimental results.
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基金项目：
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作者简介：
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参考文献：
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1 S Ahmad,B M Irons& O C Zienkiewicz. Analysis ofThick and Thin Shell Structures by Curved Finite Elements.Int.J. Num. Meth. Engng, 1970(2): 419~451
2 K J hthe. Finite Element Procedures in EngineeringAnalysis.Prentice-Hall Inc.,Englewood Cliffs,New Jersey.1982.
3张卫东,阮雪输,吴公明.板料成形过程的三维数值模拟.模具技术.1997(1):3
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