Abstract
The penetration of long rods into semi‐infinite targets is a three‐stage process, in which the first (entrance) and last are very short, and transient, while the second phase (primary penetration) is a long and quasi‐steady process. The present paper summarizes our recent work on the entrance phase using 2D numerical simulations of strengthless steel rods (L/D=5–20) impacting aluminum targets at 1–4 km/s. We look for the significance of this phase as impact velocity, target strength, and penetrator’s length are increased. We also show that the target free surface (impact face) is not the cause for the entrance phase. Rather, it is the passage from a cylindrically‐shaped to a mushroom‐shaped penetrator nose which is responsible for this phase.
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