Compound armour

Compound armour

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 top of several inches of teak to absorb the shock of projectile impact. A typical installation consisted of four to five inches of iron backed by thirty-six inches of solid wood timbers.

Various experiments were carried out in order to improve the armour, which included breaking up the armour into a laminate of several thinner layers of iron with wood between them, as well as various experiments with cast vs. wrought iron. In all of these experiments, simple blocks of wrought iron consistently proved to provide the best protection.

There had been several attempts to improve on iron with the addition of harder steels on the face, but these all failed for the same reason as the earlier laminate experiments; the ability for the armour to spread sideways into its softer backing allowed it to be penetrated more easily. In the case of steel facing, the problem was that the steel would not adhere well to the underlying iron, allowing it to shift or separate entirely.

In 1876 a competition was held by the Italian Navy at Spezia to trial new armours. By that point conventional iron armours had to be 22 inches (560 mm) thick to stop contemporary naval artillery. The hands-down winner was a new soft steel from the French firm of Schneider et Cie, but this proved to be prone to breaking when stressed, making it less useful in naval applications.

Compound armour

Compound armour was made from two different types of steel; a very hard but brittle high-carbon steel front plate backed by a more elastic low-carbon wrought iron plate. The front plate was intended to break up an incoming shell, whilst the rear plate would catch any splinters and hold the armour together if the brittle front plate shattered.

Steel plates positioned in front of iron plates had been tried unsuccessfully, for example in a trial by the Italian Navy at Spezia in 1876. The problem of welding them together was solved independently by two Sheffield engineers, A. Wilson of John Brown & Company and J. D. Ellis of Cammell Laird. Wilson's technique, invented in 1877[1], was to pour molten steel onto a wrought iron plate, whilst Ellis' was to position the two plates close together and pour molten steel into the gap. In both cases, the plate formed was rolled down to about half of the original thickness. The steel front surface formed about one-third of the thickness of the plate.

Compound armour was initially much better than either iron or steel plates, about a 25% improvement. Throughout the decade continuous improvements were made in techniques for manufacturing both compound armour and steel armour. Nevertheless by the end of the decade all-steel plates had decisively edged ahead of compound armour, and the latter had become obsolete. Two major reasons for this were the introduction of forged chrome-steel shot in 1886 and the discovery of nickel-steel alloys in 1889 which proved particularly effective as armour plate.

For instance, a trial by the French Navy at Gavre in 1880 found compound armour superior to all-steel plates. An 1884 trial in Copenhagen found that there was little difference between the two types, although compound armour was subsequently ordered by the Danish Navy, probably because it was cheaper. At the same time a similar trial to select the armour of the Italian battleship Lepanto saw 20-inch-thick (510 mm) compound armour plate demolished by two shots of the 10-inch calibre guns which were to be fitted to the ship, whilst the same projectiles were shattered by 20 inches of French Creusot steel plate.


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • Chobham armour — A pre series American M1 Abrams, the first main battle tank type to be protected by Chobham armour …   Wikipedia

  • Chinese armour — Ceremonial military uniform of the Qianlong Emperor (r. 1735–1796). China has a long history of armour and weapons development. China has many varieties of armour, but the most were of the lamellar, coat of plates, brigandine and scaled varieties …   Wikipedia

  • naval ship — Introduction       the chief instrument by which a nation extends its military power onto the seas. Warships protect the movement over water of military forces to coastal areas where they may be landed and used against enemy forces; warships… …   Universalium

  • Harvey armor — Harvey armour was a type of steel armour developed in the early 1890s in which the front surfaces of the plates were case hardened. The method for doing this was known as the Harvey process. This type of armor was used in the construction of… …   Wikipedia

  • Pre-dreadnought battleship — is the general term for all of the types of sea going battleships built between the mid 1890s and 1905. Pre dreadnoughts replaced the ironclad warships of the 1870s and 1880s. Built from steel, and protected by hardened steel armour, pre… …   Wikipedia

  • Russian battleship Dvenadsat Apostolov — Dvenadsat Apostolov at anchor. Protruding over her bow is a mooring boom, not a bowsprit Class overview Name: Dvenadsat Apostolov …   Wikipedia

  • Russian battleship Navarin — Career Nam …   Wikipedia

  • HMS Inflexible (1876) — HMS Inflexible was a Victorian ironclad battleship carrying her main armament in centrally placed turrets. The ship was constructed in the 1870s for the Royal Navy to oppose the perceived growing threat from the Italian Regia Marina in the… …   Wikipedia

  • Colossus class battleship (1882) — HMS Colossus, lead ship of the class, painted in 1891, Malta? Class overview Builders: Portsmouth Dockyard, Pembroke Dockyard Operators …   Wikipedia

  • HMS Centurion (1892) — HMS Centurion was a predreadnought second class battleship of the Royal Navy. She was part of the three ship Centurion class, designed for long range patrolling of the United Kingdom s far flung empire.Technical CharacteristicsHMS Centurion was… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”