Perforation of Inconel 718 plates struck by flat-nosed projectiles

Purpose The purpose of this paper is to investigate the perforation of Inconel 718 superalloy plates struck by a flat-nosed projectile numerically and theoretically. Design/methodology/approach Finite element models are first established for the perforation of Inconel 718 superalloy plates with different thicknesses and numerical simulations are performed. A previously proposed theoretical model is then used to analyze the numerical results and further discussions are made on the energy absorption mechanisms. Parametric study is then carried out to examine the influences of various parameters on the perforation of the Inconel 718 plates. Findings Numerical results show that the “plateau” phenomenon where ballistic limit increases slightly with increasing plate thickness also exists in the perforation of Inconel 718 struck by the flat-nosed projectile. It transpires that the theoretical model agrees well with the numerical results in terms of ballistic limit, residual velocity and transition of failure modes. It also transpires that the theoretical model can predict the “plateau” phenomenon in the perforation of Inconel 718 plates by flat-ended projectiles. Originality/value The findings of this research have practical applications in the design and evaluation of Inconel 718 aero engine casings against projectile impact.