为了研究改性低密度聚四氟乙烯材料的力学性能,利用万能试验机进行了准静态拉伸和压缩试验,通过霍普金森杆实验研究其在冲击载荷作用下的动态力学特性。对不同长径比改性与非改性试样在不同载荷加载下的力学特性以及不同冲击速度下的动态响应特性进行了分析。结果表明,通过在聚四氟乙烯材料中添加铜粉可以提高其抗拉强度,改善伸长率,增强抗压缩强度;随应变率的增大,改性聚四氟乙烯的屈服强度得到提高。 In order to study the mechanical properties of the modified low-density polytetrafluoroethylene, quasi-static tensile and compressive tests were carried out by using a universal testing machine, and the dynamic mechanical properties of the modified low-density polytetrafluoroethylene under impact loading were investigated by Hopkinson bar test. The mechanical properties of modified and unmodified samples with different aspect ratios under different loadings and the dynamic response characteristics under different impact velocities were analyzed. The results show that the tensile strength, the elongation and the compressive strength can be increased by adding copper powder into the PTFE material. The yield strength of the modified PTFE increases with the increase of the strain rate.