Thermomechanical modeling of transient thermal damage in cannon bore materials

Evolution of anodic stress corrosion cracking in a coated material

“…A two-dimensional Cartesian coordinate system is introduced, with its origin at the tip of the crack in the coating. Due to the symmetry about the x axis, only (Sopok et al 2005a,b;Underwood et al 2004Underwood et al , 2007 Fig. 3 Initial pit shaped as a half-circle.…”

“…(Sopok et al 2005a,b;Underwood et al 2004Underwood et al , 2007. The material removal in these cases is perhaps not only due to classical corrosion, but also erosion, wear and thermal degradation.…”

“…This coating-substrate system was subjected to both thermal and mechanical loading as well as wear and erosion in an aggressive environment. Figure 2 shows schematic illustrations of different crack patterns from micrographs in Sopok et al (2005a,b), Underwood et al (2004Underwood et al ( , 2007. The attacks are found at locations where cracks in the coating reach the interface.…”

“…The result is that the amplitude of waves with wavelengths longer than this λ cr increases, while waves with shorter wavelengths is suppressed with time. Sopok et al (2005a,b) and Underwood et al (2004Underwood et al ( , 2007 reported material removal and crack development at the interface between coating and substrate material in gun barrels. Even though their studies focussed on the wear and cracking of the coating inside a gun bore, they also reported cracking in the substrate material.…”

Isothermal Oxidation Behavior of Electrospark Deposited NiCrAlY Coatings on Gun Steel at 950 °C

“…Thermal damage observed in fired cannons has increased noticeably in recent years, owning to the use of higher and more sustained combustion gas temperatures for improved cannon performance [1]. The bore surfaces of many medium and large caliber guns have been coated to enhance the service performance of the gun barrels, which are subject to erosive and corrosive wear [2].…”