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本文应用逐次单元法推导了开式冲孔变形力计算公式。在公式推导过程中，利用功的平衡原理，补偿了由变形体分区假设所引起的误差，并采用精确塑性条件，使计算结果和实验结果符合良好。本文还提出了开式冲孔时的平均等效应变计算公式
In this paper, the formula of deforming force for open punching is deduced by using successive element method. In the process of formula derivation, the principle of work balance is used to compensate the error caused by the deformation body partitioning assumption, and the exact plastic condition is adopted to make the calculation and experimental results in good agreement. The paper also proposed the average equivalent strain calculation formula when open punching