氟聚物基活性材料动态压剪实验研究

针对典型聚四氟乙烯/铝(PTFE/Al)（质量分数73.5%/26.5%）氟聚物基活性材料，开展不同应变率、不同温度下的准静态、动态压缩实验；基于不同预设剪切带宽度的帽状试样，开展不同应变率下的动态压剪实验。准静态（应变率10^-3 s^-1）及不同应变率（3×10³~7×10³ s^-1）、不同温度（20 ℃，100 ℃，150 ℃，200 ℃）条件下的动态压缩实验表明，PTFE/Al活性材料是一种典型的弹塑性材料，具有显著应变硬化、应变率强化和热软化效应。不同宽度（500 μm，300 μm，100 μm）预设剪切带帽状试样动态压剪实验表明，剪切带宽度不同导致的局部温升和热效应对材料动态压剪力学响应及材料参数影响显著。

Dynamic Compression-shear Study of Fluoropolymer-matrix Reactive Materials

To characterize the mechanical properties of PTFE/Al (73.5 wt.%/26.5 wt.%) fluoropolymer-matrix reactive materials,quasi-static and dynamic compression tests at elevated strain rates and temperatures, as well as dynamic compression-shear tests based on hat-shaped specimens with predesigned shear bands of different widthsare conducted. Quasi-static (10^-3 s^-1) and dynamic compression tests at elevated strain rates (3×10³-7×10³ s^-1) and temperatures (20 ℃,100 ℃,150 ℃, 200 ℃) show that the PTFE/Al material is a typical elasto-plastic material with strain hardening, strain rate strengthening and thermal softening effects. Dynamic compression-shear tests based on hat-shaped specimens with predesigned shear bands of different widths(500 μm,300 μm,100 μm)show that the difference in shear band widths induceslocalized thermal and temperature rise and hasa prominent effect on the dynamic response of fluoropolymer-matrix reactive materials.