This is plate impact experiment. Thin plate moves with a high velocity towards a thick plate from the same material. After impact these plates join, but in the middle of the thick plate appears a spall crack, which leads to separation of so called spall plate, which usually has same thickness as the thin plate.
And this is the same result from different directions of view. Please note the axial hole, which appears in the centre of the spall plate.
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Designed by Julia Asaturova