The study explores an unforeseen effect of locally increased damage in a witness plate. In a series of tests, an explosive train of a particular configuration was used. In the control series the booster was completely separated from the witness plate, while in another series a through bore was drilled into the separating material. It was found that the control series of detonation trains (without the through bore) produced a round tearing of the witness plate following the contour of the main explosive. However, the detonation trains housed by the bored element produced an additional, unexpected puncture in the witness plate under the through bore. A study focusing on this phenomenon included a series of field tests in which the explosive design was modified in various ways. A series of FEM simulations were performed in order to study the effect in qualitative and quantitative terms. The results of the experiment and analysis indicate that there is a positive correlation between the geometry and position of the bore in the plastic spacer and the size of the puncture in the witness plate beneath. The repetition of the phenomena in relation to engineering parameters was demonstrated.
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