SN-42 - Rifle Resistant Armor - Armor Piercing Ammunition Core Hardness and Protection

Armor Piercing Ammunition Core Hardness and Protection

The standards for armor-piercing rifle bullets aren't clear-cut, because the penetration of a bullet depends on the hardness of the target armor. However there are a few general rules. For example, bullets with a soft lead-core and copper jacket are too easily deformed to penetrate hard materials, whereas rifle bullets manufactured with very hard core materials, like tungsten carbide, are designed for maximum penetration into hard armor. Most other core materials would have effects between lead and tungsten carbide. Many common bullets, such as the 7.62x39mm M43 standard cartridge for the AK47 rifle, have a steel core with hardness rating ranging from Rc35 mild steel up to Rc45 medium hard steel.

Additionally, as the hardness of the bullet core increases, so must the amount of ceramic plating used to stop penetration. Like in soft ballistics, a minimum ceramic material hardness of the bullet core is required to damage their respective hard core materials, however in armor-piercing rounds the bullet core is eroded rather than deformed.

The US Department of Defense uses two classes of protection from armor-piercing rifle bullets. The first, the Small Arms Protective Insert (SAPI), called for ceramic composite plates with a mass of 20–30 kg/m2 (4–5 lb/ft2). Later, the Enhanced SAPI (ESAPI) specification was developed to protect from more penetrative ammunition. ESAPI ceramic plates have a density of 35–45 kg/m2 (7–9 lb/ft2), and are designed to stop bullets like the 7.62 x 63 AP(M2) with an engineered hard core.

Cercom, now BAE systems, CoorsTek, Ceradyne, Tencate, Honeywell, DSM, Pinnacle Armor and a number of other engineering companies develop and manufacture the materials for composite ceramic rifle armor.

Read more about this topic:  SN-42, Rifle Resistant Armor

Famous quotes containing the words armor, piercing, core, hardness and/or protection:

    When a strong man, fully armed, guards his castle, his property is safe. But when one stronger than he attacks him and overpowers him, he takes away his armor in which he trusted and divides his plunder.
    Bible: New Testament, Luke 11:21.22.

    O falling fire and piercing cry
    and panic, and a weak mailed fist
    clenched ignorant against the sky!
    Elizabeth Bishop (1911–1979)

    For books are more than books, they are the life
    The very heart and core of ages past,
    The reason why men lived and worked and died,
    The essence and quintessence of their lives.
    Amy Lowell (1874–1925)

    Despots play their part in the works of thinkers. Fettered words are terrible words. The writer doubles and trebles the power of his writing when a ruler imposes silence on the people. Something emerges from that enforced silence, a mysterious fullness which filters through and becomes steely in the thought. Repression in history leads to conciseness in the historian, and the rocklike hardness of much celebrated prose is due to the tempering of the tyrant.
    Victor Hugo (1802–1885)

    Without infringing on the liberty we so much boast, might we not ask our professional Mayor to call upon the smokers, have them register their names in each ward, and then appoint certain thoroughfares in the city for their use, that those who feel no need of this envelopment of curling vapor, to insure protection may be relieved from a nuisance as disgusting to the olfactories as it is prejudicial to the lungs.
    Harriot K. Hunt (1805–1875)