Dynamic structural responses of high-performance fiber-reinforced cement composites panels subjected to high-velocity projectile impact loadings

This study investigates the structural performance of high-performance fiber-reinforced cement composite (HPFRCC) panels subjected to a high-velocity projectile impact. In the projectile impact test, the matrix strength, specimen thickness, and initial velocity of the projectile are considered as experimental parameters. The penetration depth and the crater diameters on both the front and rear faces for each specimen were measured to confirm the changes in the failure patterns depending on the parameters. Moreover, a finite element (FE) model was established to estimate the failure mechanism of the panels induced by the projectile impact loading with the LS-DYNA program. Among various concrete constitutive models, the continuous surface cap (CSC) model was adopted in this study, and several parameters included in the material model were calibrated to consider the mechanical properties of HPFRCCs. The analytical results obtained from the modified material model were verified through a comparison with experimental results for the HPFRCC panels, and the performance of the numerical model was evaluated.