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采用刚塑性有限元法对管材无模拉伸时变形力进行了理论解析．变形力有限元计算值与实验结果相吻合，相对误差小于１３％ ．
The rigid plastic finite element method is used to analyze the deformation force of the pipe without die tensile. Deformation force calculated by finite element analysis and experimental results are consistent, the relative error is less than 13%.