Polarization response characteristics of 6061Al and PMMA sheets under impact load

Abstract

The material will induce shock polarization under the action of shock wave. Aluminum alloys (such as 6061Al) are used as the main material for spacecraft skins, panels and frames. The impact polarization effect generated during the cratering deformation (compression and shearing) of space debris will induce the surface discharge of the orbiting satellite. Polymethyl methacrylate (PMMA) materials are often used in combination with electronic devices of weapon equipment. Under high overload, PMMA will produce shock polarization effect, electromagnetic interference on electronic devices, and even trigger by mistake. Therefore, it is of great significance to reveal the impact polarization characteristics of different types of materials (metal, polymer) for improving the bulletproof protection ability of in-orbit satellites, protective armor and electronic devices. In this paper, the 6061Al and PMMA thin plates were taken as the research object, and the universal testing machine combined with LCR was used to measure the capacitance and resistance of 6061Al and PMMA under different given loads by combining theoretical analysis, experiment and simulation. At the same time, the first stage light gas gun is used to study the local impact induced electro-mechanical response of metal and polymer sheet materials. On this basis, the AUTODYN-ABAQUS/Explicit-COMSOL co-simulation under corresponding experimental conditions was carried out to obtain the distribution rules of temperature and strain gradient. Based on the theory of flexoelectric effect, the impact polarization response characteristics of 6061Al and PMMA materials were clarified, respectively. The results show that the impulse polarization voltage of 6061Al thin plate increases first and then gradually decreases with time. The impulse polarization voltage is proportional to the thickness. The polarization voltage of single-electrode PMMA thin plate is parabola; the polarization voltage of PMMA thin plate with two electrodes increases first and then gradually decreases. The absolute value of the strain gradient of the 6061Al thin plate increases first and then becomes stable, while the strain gradient of the PMMA thin plate increases first and then decreases.