Dynamic constitutive model and ignition behavior of enhanced Al/PTFE

•The dynamic compressive/tensile mechanical properties of the enhanced Al/PTFE projectile under different strain rates were tested by using SHPB/SHTB testing systems.•The parameters of the Zhu-Wang-Tang (ZWT) compressive constitutive equation were fitted. Based on ZWT constitutive model, numerical simulation of flattened Brazilian splitting was carried out, and dynamic compressive and tensile mechanical properties of enhanced Al/PTFE active material were obtained by combining theoretical derivation and numerical simulation of ABAQUS.•Based on the Johnson-Cook constitutive model, the parameters of the dynamic tensile constitutive equation were fitted under medium strain rates.•Based on Johnson-Cook constitutive model and equation of state (EOS) of ignition and growth, ANSYS/AUTODYN was used to simulate the process that Al/PTFE active material impacted the target. Al/PTFE reactive material is a kind of energetic material with direct damage ability. Numerical simulation is one of the most effective ways to investigate the internal damage and impact induced ignition mechanism. However, there is no suitable constitutive equation to describe the mechanical behavior of the reactive material under the impact load, therefore an appropriate constitutive model of the reactive material is of great significance. In order to obtain an appropriate constitutive model to describe the mechanical properties and impact induced ignition behavior of the material, the enhanced Al/PTFE reactive material was prepared by cold pressing and rapid cooling process. The dynamic mechanical properties of the enhanced Al/PTFE specimens under different strain rates were tested by using the SHPB/SHTB testing systems. And the parameters of the Zhu-Wang-Tang (ZWT) constitutive model were calibrated. Based on ZWT constitutive model, numerical simulation of Flattened Brazilian splitting was carried out. And dynamic compressive/tensile mechanical properties of enhanced Al/PTFE reactive material were obtained by combining theoretical derivation and numerical simulation of ABAQUS/Explicit. The effectiveness of this model is verified by comparing experimental and numerical simulation results. Futhermore, combined ZWT constitutive model with Equation of State (EOS) of ignition and growth, ANSYS/AUTODYN was used to simulate the process that Al/PTFE reactive material impacted the target. The destruction and ignition behavior of the projectile under the interaction of stress wave were explained.