PTFE/Al含能复合物的本构关系

A constitutive relation for a pressed PTFE/Al energetic composite material

室温下，利用万能材料试验机和分离式霍普金森压杆获得了PTFE／Al含能复合物在应变率10^-3～10^3S^-1范围内的压缩应力应变曲线。通过对不同应变率下力学性能的分析，初步建立了材料基于Johnson—Cook塑性模型的压缩本构方程，考虑了材料的应变硬化效应和应变率效应。利用该方程进行的PTFE／Al弹丸侵彻钢靶板的数值模拟结果与实际情况较符合，验证了该方程的可靠性和合理性，对PTFE／Al材料的实际应用也具有一定的指导作用。

The compressive behaviors of a pressed PTFE/A1 energetic composite material were experimentally investigated by split Hopkinson pressure bars and quasi-static behaviors by a universal testing machine at room temperature. Stress-strain curves of the material were obtained in the strain rate range from 10^-3s^-1 to 10^3 s^-1. According to the analysis on the compressive behavior at different strain rates, the constitutive relation considering strain-hardening effect and strain rate effect were developed based on the Johnson-Cook plastic model. The penetration of a pressed PTFE/AI composite projectile into a steel target was numerically simulated by using the developed constitutive relation. The simulated results are close to the experimental results, which validates the reliability and rationality of the developed constitutive relation, and can be used to instruct the application of the PTFE/Al material.