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本文针对塑性加工中最常见的塑性硬化材料模型，建立了其耦联系统的变分原理，并应用耦联系统的势能原理分析了镦粗变形工序。
In this paper, the variational principle of the most common plastic hardening material model in plastic processing is established and the upsetting deformation process is analyzed by the potential energy principle of the coupling system.