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基于有限变形虚功率增量型原理的弹塑性大变形有限元理论， 建立了高精度的八节点四边形单元平面应变状态下的截面分析模型，并应用非均匀有理Ｂ样条曲线描述模具截面线进行接触判断。旨在用很短的计算时间，获得较理想的板料冲压成形的模拟结果。方模具圆坯料胀形和深拉延成形过程以及发动机油底壳深拉延的模拟与试验结果， 表明了该截面分析技术的正确性、可行性和高效性。
Based on finite element theory of elastic-plastic large deformation of finite deformation virtual power increment principle, a cross-section analysis model of high-precision eight-node quadrilateral element under plane strain state is established. The non-uniform rational B-spline curve Contact judgment. The aim is to obtain the ideal simulation results of sheet metal stamping with very short calculation time. The simulation and test results of bulging and deep drawing forming of square die round billet and deep drawing of engine oil pan showed the correctness, feasibility and high efficiency of the cross-section analysis technique.