Experiment study of ejecta composition in impact phenomenon

Summary

Impact tests were held to clarify the relationship between the composition of ejecta and these of the projectile and the target plate under different impact kinetic energy and impact velocity. Two sets of impact experiments were held, one using high carbon chromium bearing steel (SUJ-2) projectile and Al2017-T4 plate (Fe/Al impact), and the other using Al2017-T4 projectile and SUJ-2 plate (Al/Fe impact). The spherical projectile is of 7.94 mm in diameter, made of Al2017-T4 or SUJ-2. The impact velocity considered is from 2.5 to 4.2km/s. By recovering and analyzing the injected SUJ-2 and the Al2017-T4 fragments separately, we can quantitatively measure the composition of the injected fragments, and clarify how it depends upon the material of the projectile and the target plane. We further investigate the effects of velocity and kinetic energy of the projectile on the ejecta composition.