Abstract: An engineering model on mass abrasion of kinetic energy(KE) penetrator is presented to predict the nose shape and mass loss of theresidual projectile after high speed penetration into concrete. Theexperimental analysis indicates that the kinetic energy of penetrator (i.e.,mass and velocity of projectile) and the hardness of aggregate of concretenoticeably affect the mass abrasion of projectile. Generalized relationshipbetween mass loss and impact function I of projectile is constructed.Graphical analysis shows that the most mass loss occur on the nose ofprojectile and the eroding nose approach to an ogival shape with a smallvalue of caliber-radius-head (CRH). The mass loss from abrasion on KEpenetrator may be evaluated through the variation of nose shapes.