A new numerical-analytical model of penetration of projectiles with eroding jacket and elastically deformable (or rigid) projectile central part into infinite targets is developed. Model predicts the influence of main structural parameters of the coating and central core on penetration. Ballistic equations include two modes of motion: joint motion of projectile’s core and solid part of its jacket; separate motion of a core and solid part of projectile jacket. Condition of transition from the first mode to the second based on force balance has been determined. From this condition critical velocity and transition time (when motion of a jacket relative to the core begins) are found.
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