Although armored vehicles can shield personnel from being crushed by falling fragments and bombs however, they are still susceptible to the dangers of Spall. Spall is a cloud of metal fragments moving at high velocity, can cause death to the people inside. Spall Liners are an essential component of any armored vehicle that can keep this from happening. Different types of spalls are produced by hitting a vehicle, including small bombs, shell fragments, and explosives.
Understanding how stresses are generated at the interface between the armor plate and projectile is vital to comprehend the impact on armored vehicles. A projectile striking an armor plate with the same in thickness as its diameter is a straightforward example. The stress wave propagates in a planar manner and is reflected back , or transmitted. The sonic impedance of the materials and the stress waves will determine the frequency.
A test shot is one that uses a 105mm warhead and is fired at an angle of 53deg. The target is left with a large hole 72b. The TOW 11 weapon produced a more fine spall, which resulted in an even larger hole 72b. The aluminum witness plate which resulted has a large hole in the 74b. This resulted from the slug, burning and small spall particles scattered across the surface.
What are Spall Liners require a space of stand-off space in order to be properly installed. This stand-off area is required because traditional spall liners carry an extremely high weight per square foot. They can require up to four pounds per square foot. The weight of a conventional spall liner increases the chance of the material being damaged. However, they are still an effective way of protecting armored vehicles against the danger of Spill Liners.
Spill Liner is an aluminum sheet designed to prevent spall movement. It is attached to a vehicle’s armor plate or the shell. The backing material must have an impedance of high and be connected to the hull or armor plate using a tough adhesive with thin bond lines. This stops the spall from being pushed off the armor plate.
Active spall suppression armor consists of two parts comprised of an armor material or plate, and spall backing materials. The first is connected to the armor while the second is attached using adhesives. The latter may be putty-like or be hard tiles or sheets. Polymer can also contain polycizituline and sodium chloride. The backing material can be made to adhere to the metal armor’s inner surface.