Investigation of impact performance of perforated plates and effects of the perforation arrangement and shape on failure mode

Abstract

Searching for lighter protective structure and better energy absorption material is the key goal to improve the protection performance of moving platforms. The impact performance of perforated structures subjected to projectile impact and effects of the perforation arrangement and shape on failure mode are investigated experimentally and numerically. Three different impact velocities, three kinds of hole patterns (circle, triangle and square) and two types of hole arrangements (matrix type and dislocation type) of the perforated plate specimens are discussed in this research. The Mie-Grüneisen equation of states and Johnson-Cook strain-rate sensitive material models are selected in the numerical model. The numerical results agree well with the experimental results. The results show that when the impact velocity, hole shape and hole arrangement are different, the failure modes of perforated plate and witness plate can be divided into eight and four modes, respectively. The projectile deflection effects are observed when the projectile passes through the perforated plate. The deviation angle of projectile decreases with the increase of impact velocity. The deviation angle of perforated plate with circle hole and triangle hole by dislocation type is greater than that by matrix type at the same impact velocity, but the conclusion of perforated plate with square hole is just the opposite. The ballistic deflection effect of the perforated structure with triangular hole is greater than that with the circular hole and square hole. The results obtained from the study will provide a reference to the research of new spatial or layered armor systems containing the perforated plates.