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Chobham armour is a composite armour developed at the British tank research centre on Chobham Common.
Although the exact composition of Chobham armour remains a secret, it appears to be a combination of ceramic layered between armour steel plating, a combination that is excellent at defeating high explosive anti-tank (HEAT) rounds.
The latest version of Chobham armour is used on the Challenger 2 (called Dorchester armour), and (though the composition most probably differs) the M1 Abrams series of tanks, which according to official sources is presently protected by silicon carbide tiles.
The most common type of composite armour today is Chobham armour, first developed and used by the British in the experimental FV 4211 tank, which was based on Chieftain tank components.
Chobham sandwiches a layer of ceramic between two plates of steel armour, which was shown to dramatically increase the resistance to high explosive anti-tank (HEAT) rounds.
Chobham's precise mechanism for defeating HEAT was something of a mystery until the 1980s.
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