Rolled homogeneous armour
- Rolled homogeneous armour
Rolled homogeneous armour, or RHA, is a basic type of steel plate, used as a baseline to compare the effectiveness of military vehicle armour.
Through the end of World War II, the type of armour for almost all tanks and other armoured vehicles was sheets of steel. Increasing the protection on a vehicle meant adding thicker sheets of steel, increasing the vehicle's weight and reducing its mobility. Since then, other forms of armour, incorporating empty spaces and materials such as ceramics or depleted uranium in addition to steel, have been developed. Made ineffective by modern weapons using high-impact or high-temperature cutting jets, RHA itself is obsolete due to advances in vehicle armor.
The more recent term RHAe (Rolled Homogeneous Armour equivalency) is used when giving a rough 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 armor shape, quality, material, and case-by-case performance, the usefulness of RHAe in comparing different armour is debatable.
pecifications
For current United States Army use, RHA steel is produced to Military standard MIL-A 12560 by several manufacturers. The newest standard used is MIL-A-46100. [ [http://www.intlsteel.com/PDFs/armor.pdf http://www.intlsteel.com/PDFs/armor.pdf] , accessed Sept 21, 2006] It is very similar to but not identical to standard high strength steel alloy 4340 in the AISI steel grades, though mechanical properties are very similar to that alloy. [ [http://www.eng-tips.com/viewthread.cfm?qid=159941&page=6 http://www.eng-tips.com/viewthread.cfm?qid=159941&page=6] , accessed Sept 21, 2006]
ee also
*Sloped armour
*Composite armour
*Reactive armour
*Vehicle armour
References
Wikimedia Foundation.
2010.
Look at other dictionaries:
Armour — (or armor) is protective covering, most commonly manufactured from metals, to prevent damage from being inflicted to an individual or a vehicle through use of direct contact weapons or projectiles, usually during combat. While early armour tended … Wikipedia
Armour-piercing discarding sabot — A Phalanx Mk149 APDS discarding its sabot and petals Armour piercing discarding sabot (APDS) is a type of kinetic energy projectile fired from a gun to attack armoured targets. APDS rounds are sabot rounds and were commonly used in large calibre… … Wikipedia
Sloped armour — is armour that is neither vertical nor horizontal and is typically mounted on tanks and other armoured fighting vehicles (AFVs). For a given normal to the surface of the armour, its plate thickness, increasing armour slope improves the armour s… … Wikipedia
Compound armour — was a type of armour used on warships in the 1880s. By the end of the decade it had been rendered obsolete by nickel steel armour. Prior armours Prior to the 1880s, all naval armour plating was made from uniform homogeneous wrought iron plates on … Wikipedia
Steel — For other uses, see Steel (disambiguation). The steel cable of a colliery winding tower … Wikipedia
Object 187 — Type Main battle tank Place of origin Soviet Union … Wikipedia
Glossary of military abbreviations — List of terms, acronyms, information, related to modern armour, artillery, infantry, weapons, and related military subject matter.* AA anti aircraft * AAA anti aircraft artillery Triple A * AAAV Advanced Amphibious Assault Vehicle * AAD Armoured… … Wikipedia
Ch'ŏnma-ho — Infobox Weapon is vehicle=yes type=Main battle tank origin=flagcountry|North Korea design date=1990 [http://www.jedsite.info/tanks charlie/charlie/chonma ho series/chonmaho series.html CH¹ONMA HO.] Retrieved on December 11, 2007.] designer=Second … Wikipedia
Blindage homogène laminé — Pour les articles homonymes, voir Rha. Le blindage homogène laminé (BHL) ou acier moulé, nommé souvent sous son terme anglais Rolled homogeneous armour (RHA), est un type d acier utilisé pour le blindage des véhicules blindés. Sommaire 1… … Wikipédia en Français
High Explosive Incendiary/Armor Piercing Ammunition — (HEIAP) is a form of shell which combines both an armour piercing capability and a high explosive effect. In this respect it is a modern version of armour piercing shell. The ammunition may also be called Semi armor piercing high explosive… … Wikipedia
