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Behind-armor debris is debrisparticleseroded from the penetrator of armor as well as spalled material ejected from the target itself.
Behind-armor debris characteristics can be described by the number, position, and size range of debris particles.
References
^ B. Pedersen, S Bless. (2006). "Behind-armor debris from the impact of hypervelocity tungsten penetrators". International Journal of Impact Engineering. 33 (1–12): 605–614. doi:10.1016/j.ijimpeng.2006.09.007.