目的 为了改进Sherwood-Frost本构模型，提升EPE高速、大变形冲击仿真精度。方法 通过万能材料试验机对EPE进行静态压缩试验，获得不同压缩速率下的应力-应变曲线，结合热激活机制Seeger模型与反比例函数模型，对Sherwood-Frost本构模型应变率项进行改进，并用试验验证模型的可靠性；基于改进后的Sherwood-Frost本构模型，以ABAQUS软件为平台，对EPE材料进行冲击模拟仿真，并用试验数据验证仿真的准确性。结果 模拟仿真结果与试验数据吻合良好；在冲击高度为1200，1300 mm的条件下，最大加速度误差分别为6%，2.03%。结论 改进后的Sherwood-Frost本构模型具有良好的可靠性；基于该模型对EPE进行高速、大变形的冲击仿真，准确性较高。

The work aims to improve Sherwood-Frost constitutive model and improve the simulation accuracy of EPE impact with high speed and large deformation. Static compression tests were carried out on EPE with a universal material testing machine to obtain stress-strain curves at different compression rates. The strain rate terms of Sherwood-Frost constitutive model were improved by combining Seeger model of thermal activation mechanism with inverse proportional function model, and the reliability of the model was verified by experiments. The Sheerwood-Frost constitutive model was used to simulate the impact of EPE materials on the ABAQUS software, and the accuracy of the simulation was verified by the test data. The improved constitutive model was in good agreement with the experimental data, and the maximum acceleration errors were 6% and 2.03% respectively at the impact height of 1200 mm and 1300 mm. The improved Sherwood-Frost constitutive model has good reliability, and the impact simulation of EPE with high speed and large deformation based on the model has good accuracy.