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用流函数法分析了聚合物拉伸成形时，颈缩的发生和扩展过程。文中论证了采用流函数法的优越性和适用性，并将流函数法计算结果和有限元法计算结果作了对比。
The flow function method was used to analyze the occurrence and expansion of necking during polymer forming. In this paper, the superiority and applicability of the stream function method are demonstrated. The calculated results of the stream function method and the finite element method are compared.