碳纤维对PTFE/Al反应材料动态力学行为和点火特性影响研究

Effect of Carbon Fiber on Dynamic Mechanical Behavior and Ignition Characteristics of PTFE/Al Reactive Materials

本研究旨在探讨短切碳纤维(carbon fiber,CF)单丝对聚四氟乙烯/铝(PTFE/Al)反应材料动态力学和点火特性的影响.首先,制备了PTFE/Al和PTFE/Al/CF反应材料,开展了材料的动态力学性能测试,获得了力学性能与点火参数,记录了冲击压缩过程.结果表明,添加CF导致PTFE/Al材料的弹性模量大幅降低,弹性模量因子的应变率效应与失效应变因子的应变率效应降低.在此基础上,分析了不同CF质量分数对反应材料的冲击压缩过程与回收试件、冲击点火速度(应变率)阈值的影响.结果表明,纤维通过固结强化作用,低CF质量分数的PTFE/Al/CF试件具有较好的抗动态压缩性和能量吸收效果.随着CF质量分数的提高,TFE/Al/CF反应材料速度(应变率)点火阈值降低,反应强度和反应时间有提高.为碳纤维填充改性PTFE/Al反应材料的设计和冲击应用提供参考.

To explore the effect of chopped carbon fiber(CF)monofilament on the dynamic mechanics and ignition characteristics of PTFE/Al reactive materials,some research works were carried out.Firstly,PTFE/Al and PTFE/Al/CF reaction materials were prepared,and the dynamic mechanical properties of the materials were tested,the mechanical properties and ignition parameters were obtained,and the impact compression process was recorded.The results show that the elastic modulus of PTFE/Al material can be greatly reduced by adding CF,causing the strain rate effect reduction of elastic modulus factor and failure strain factor.And then,based on above achievements,the impact compression process of reactive materials with different CF content and the recovery specimen,impact ignition rate(strain rate)threshold were analyzed.The results show that the PTFE/Al/CF specimens with low CF content present better dynamic compression resistance and energy absorption effect due to the solidifying and strengthening of fiber.So,with the increase of CF content,the ignition threshold and strain rate decrease,and reaction strength and reaction time increase for the PTFE/Al/CF reaction material.All the results can provide a reference for the design and impact application of carbon fiber filled modified PTFE/Al reaction materials.