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Spall from knapping obsidian arrowheads and other tools. These unique obsidians are found at Glass Buttes, Oregon. The terms spall, spalling, and spallation have been adopted by particle physicists; in neutron scattering instruments, neutrons are generated by bombarding a uranium (or other) target with a stream of atoms. The neutrons that are ...
This fragmentation by blast wave is known as 'scabbing' or 'spalling', with the fragments termed 'scabs or 'spall'. [4] [2]Depending upon the armour thickness, a heavy piece of target material (4 to 10 kg (8.8 to 22.0 lb) for a 120 mm (4.7 in) round used in Arjun MBT [4]) can separate out from the other end of the target with supersonic velocities.
Beginning during the Cold War, many AFVs have spall liners inside of the armour, designed to protect crew and equipment inside from fragmentation (spalling) released from the impact of enemy shells, especially high-explosive squash head warheads. Spall liners are made of aramids (Kevlar, Twaron), UHMWPE (Dyneema, Spectra Shield), or similar ...
Laser induced spallation is a recent experimental technique developed to understand the adhesion of thin films with substrates.A high energy pulsed laser (typically Nd:YAG) is used to create a compressive stress pulse in the substrate wherein it propagates and reflects as a tensile wave at the free boundary.
The overall protection will include a spall liner to minimize perforation effects within a vehicle when the vehicle takes hostile fire. [44] [45] The JLTV has a requirement for an automatic fire-extinguishing system to protect the crew cabin. [42] Fuel tanks are mounted externally and shielded by the JLTV structure.
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Included in these methods are the plug-in approach of Blischke and Halpin (1966), the Bayesian approach of Spall and Maryak (1992), and the maximum likelihood approach of Winkler and Bickert (2012). The Spall and Maryak approach applies when the shot data represent a mixture of different projectile characteristics (e.g., shots from multiple ...