中文摘要：

为了掌握纯铝在ECAPT过程中的力学变化规律，利用刚塑性有限元技术对纯铝1100的ECAPT变形行为进行数值模拟，重点分析了载荷在挤压过程中的变化规律及产生变化的原因。结果表明：ECAPT过程大致分为载荷骤升、2次小幅度升高和载荷下降4个阶段；载荷峰值随着摩擦因数的增大迅速增大，应采取有效的润滑措施减小摩擦从而降低载荷峰值，提高模具寿命；随着摩擦因数的增大，载荷在达到各阶段峰值后下降趋势越来越明显。

英文摘要：

In order to master the variation regularity of mechanics in the ECAPT process, the rigid-plastic FEM has been used in the numerical simulation of ECAPT of aluminum 1100. The load variation and the reasons were mainly investigated. The results show that ECAPT of aluminum 1100 can be classified into four phases in the process： the load increases fast, the load increases slowly two times, the load declines. Peak value of load will increase swiftly with the friction coefficient increasing. An effective lubricating measure should be adopted to reduce the peak value and prolong the mould life. With friction coef- ficient increasing the load will decline obviously when it reaches the peak value.