Present Use of RHA
Since World War II, because of a reduction in effectiveness against new attack methods (mainly shaped charges and improved kinetic energy penetrators), RHA has been superseded by composite armour, which incorporates air spaces and materials such as ceramics or plastics in addition to steel, and explosive reactive armour.
For the purposes of testing and calibration of anti-tank guns, the term RHAe (Rolled Homogeneous Armour equivalency) is used when giving an estimate of either the penetrative capability of a projectile or the protective capability of a type of armour which may or may not be steel. Because of variations in armour shape, quality, material, and case-by-case performance, the usefulness of RHAe in comparing different armour is only approximate.
Currently, most armoured vehicles have their basic structure formed from RHA to lend general strength and toughness against general threats.
Read more about this topic: Rolled Homogeneous Armour
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