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Vehicle armour

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Vehicle armour is a specialized layer of protection designed to withstand impacts. These layers protect personnel from bullets, shrapnel, shells, rockets, and missiles.

Plasan SandCat
Plasan SandCat

While we often think of military tanks, many different vehicles use armour. Aircraft use it to protect engines and pilots. Ships use it to maintain watertight integrity. Even civilian vehicles, such as presidential limousines or money-transport cars, use armour to reduce risks from crime.

Merkava mk iv084
Merkava mk iv084

In space, spacecraft use specialised armour to defend against micrometeoroids and space debris. The main challenge in design is weight. Heavy armour can restrict the mobility of a vehicle. Engineers must balance the level of protection with the need for speed and movement.

Armour works through several different physical mechanisms. One method is simple thickness, where a material is too dense to penetrate. Another method uses geometry, such as sloping or curving the surfaces.

WWI style ship armor
WWI style ship armor

When a projectile hits a sloped surface, it must travel through more material than if it hit perpendicularly. Sloping can also cause the projectile to deflect away entirely. Some modern systems use composite armour, which combines different materials to disrupt energy.

Add-on kit
Add-on kit

For example, Non-Explosive Reactive Armour (NERA) uses a laminate of hard plates with a low-density interlayer. When an impact occurs, this interlayer swells. This movement shifts the plates to disrupt heat jets or kinetic energy projectiles.

Metals are the most traditional building blocks for protection. Steel is widely used because it can be made hard and tough. Through a process called rolling and forging, steel billets are hammered while red hot. This removes imperfections and elongates the grain structure. This allows stress to flow through the metal rather than concentrating in one spot.

Aluminium is a common alternative when light weight is a necessity, such as on armoured cars.

Titanium is even more specialized. It has a high specific strength, meaning it is very strong for its weight. This makes it ideal for military aviation. The Soviet Su-25 and the American A-10 both use titanium to protect pilots. In these planes, the pilot sits in a bathtub-shaped titanium enclosure.

Other materials provide unique advantages against specific threats. Ceramics are highly effective at disrupting kinetic energy. When a high-speed projectile hits ceramic, the material shatters. This shattering spreads the energy and can destroy the geometry of a metal jet from a shaped charge.

IDET2007 bulletproof glass armor
IDET2007 bulletproof glass armor

Glass is also used in the form of transparent armour. Bullet-resistant glass is often a laminate. It might consist of layers of glass bonded with materials like polyvinyl butyral. Often, a layer of polycarbonate is sandwiched between glass sheets. The hard glass flattens the bullet, while the plastic provides impact resistance against physical assaults.

Composite armour represents a more complex approach to protection. This involves layers of two or more materials with different physical properties. For example, some tanks use a combination of steel and ceramics. Soviet tanks like the T-64 have used ceramic balls and aluminium sandwiched between steel. Other models used a glass filler called "Kvartz."

Add-on kit
Add-on kit

Some modern Western tanks use heavy metals like depleted uranium (DU). This extremely dense material is sandwiched between steel plates. In the M1A2 Abrams, DU is used in the front of the hull and the turret to increase protection against kinetic energy penetrators.

Historical developments show how armour has constantly evolved. Early European warships used 10 to 12.5 cm of wrought iron backed by one metre of wood. This was eventually replaced by steel, which is much stronger. In 1940, the British Admiralty developed "plastic metal" for merchant ships. This was a mixture of 50% granite, 43% limestone, and 7% bitumen. When applied in a two-inch layer, the hard granite particles would deflect bullets into the steel backing. Today, researchers are looking toward the future with nanomaterials. They are studying things like buckypaper and aluminium foam to create lighter, stronger protection.

Armour application varies significantly depending on the vehicle's role. For warships, a "belt" of armour is placed around the hull, often extending below the waterline.

WWI style ship armor
WWI style ship armor

This belt can be sloped to deflect projectiles. Many ships also include a torpedo bulkhead behind the belt to maintain watertight integrity. In aircraft, armour is focused only on vital parts like the engines or the ejection seat.

Abrams-transparent
Abrams-transparent

Ground vehicles like main battle tanks are the most heavily armoured. They are designed to survive anti-tank missiles and high-explosive weapons. Engineers often place the heaviest armour on the front of these vehicles because of combat tactics. This ensures the vehicle is always facing the most likely direction of incoming fire.

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File:Abrams-transparent.png
Abrams-transparent.png
File:Fox Scout Car (6553547749).jpg
Fox Scout Car (6553547749).jpg
File:IDET2007 bulletproof glass armor.jpg
IDET2007 bulletproof glass armor.jpg
File:Plasan SandCat.jpg
Plasan SandCat.jpg
File:WWI style ship armor.svg
WWI style ship armor.svg
File:Add-on kit.png
Add-on kit.png
File:Bundesarchiv Bild 101I-154-1986-05, Russland, Sturmgeschütz III mit Seitenschürzen.jpg
Bundesarchiv Bild 101I-154-1986-05,...
File:Merkava mk iv084.jpg
Merkava mk iv084.jpg
File:M60A1-Patton-Blazer-latrun-2.jpg
M60A1-Patton-Blazer-latrun-2.jpg
File:IDF-D9-Zachi-Evenor-001.jpg
IDF-D9-Zachi-Evenor-001.jpg
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