Energy absorption and impact resistance of sandwich composite alloy structures under dynamic impact

Abstract

Abstract A new sandwich composite structure is prepared based on warm rolling process. The dynamic mechanical property of the sandwich composite structure is investigated through split Hopkinson pressure bar (SHPB) experiment. The Johnson–Cook constitutive model is modified based on the SHPB experiment result, taking into account the synergy between strain softening and strain rate softening. Projectile penetration simulation is performed on the sandwich composite structure using projectile penetration schemes for different angles and different structural dimensions to examine how penetration angle and structural dimensions affect the dynamic energy absorption property of sandwich composite structures. Vibration equations of sandwich structures are inferred based on Hamilton’s theory to reveal the dynamic energy absorption mechanisms of these structures. The results show that symmetric structures have better damping performance than asymmetric structures; maximum stress will display a rise-fall-rise profile with increasing penetration angle; for symmetric structures with damping layer thickness of 4 mm, the projectile deflection angle will first increase and then reduce with increasing penetration angle and the projectile deflection angle will approximate 40°at penetration angle 10°.