含孔隙富铝聚四氟乙烯/铝含能材料冲击温升规律

为研究孔隙度对富铝含量聚四氟乙烯/铝（PTFE/Al）含能材料冲击温升效应的影响，采用考虑熔化效应的一维粘塑性孔洞塌缩模型，对该材料的冲击温升进行了理论分析。建立孔隙度分别为10%、20%、30%的富铝PTFE/Al细观离散化模型，并借助非线性动力有限元软件AUTODYN开展细观数值模拟，对冲击加载下含孔隙富铝PTFE/Al含能材料的孔洞压缩及温升规律进行了分析。通过分离式霍普金森压杆实验对数值模拟结果进行了验证。结果表明：材料内部温度随着入射杆的周期性加载总体呈现出间歇性升高的现象；在压缩过程中，材料内部温度升高主要受孔洞内径速度和屈服强度的影响，且孔隙度为10%的富铝PTFE/Al含能材料（质量配比50/50，试件尺寸8 mm× 5 mm）相比孔隙度为20%和30%的富铝含量PTFE/Al含能材料，其温度升高最高。研究结果可为PTFE/Al含能材料的工程化应用提供参考。

Impact Temperature Rise Law of Porous Aluminum-rich PTFE/Al Energetic Material

In order to obtain the influence of porosity on the temperature rise effect of aluminum-rich PTFE/Al energetic materials, an one-dimensional viscoplastic cavity collapse model considering the melting effect is used to theoretically analyze the impact temperature rise of the material. A micro-discrete model of aluminum-rich PTFE/Al with porosity of 10%, 20%, and 30% was established, and the numerical simulation was performed with the help of AUTODYN nonlinear dynamic finite element software to analyze the pore compression and temperature rise of porous aluminum-rich PTFE/Al energetic materials under impact loading. In addition, the numerically simulated result was validated through a split Hopkinson pressure bar (SHPB) experiment. The results show that the internal temperature of the material generally increases intermittently with the periodic loading of the incident bar; during the compression process, the temperature rise of porous aluminum-rich PTFE/Al energetic materials is mainly affected by the hole inner diameter velocity a· and the yield strength Y; compared with 20% and 30% porosity aluminum-rich PTFE/Al energetic materials, the 10% porosity aluminum-rich PTFE/Al energetic materials have the highest temperature rise during material compression.