Obturação
Sign in to saveObturation is the necessary barrel blockage or fit in a firearm or airgun created by a deformed soft projectile. A bullet or pellet made of soft material and often with a concave base will flare under the heat and pressure of firing, filling the bore and engaging the barrel's rifling. The mechanism by which an undersized soft-metal projectile enlarges to fill the barrel is, for hollow-base bullets, expansion from gas pressure within the base cavity and, for solid-base bullets, "upsetting"—the combined shortening and thickening that occurs when a malleable metal object is struck forcibly at one
Article · Português
Obturação refere-se à selagem, que se pretende sempre perfeita, dos gases da pólvora, dentro do cano de uma arma de fogo, quando de um disparo, selagem essa que tem de fazer com que esses gases sejam impedidos de passar quer para o mecanismo da culatra - a chamada obturação para trás -, e para a frente do projéctil - a chamada obturação para a frente
Abstract from DBpedia / Wikipedia · CC BY-SA