Thermal–chemical–mechanical gun bore erosion of an advanced artillery system part one: theories and mechanisms

Sopok, Samuel; Rickard, C. E.; Dunn, S.

doi:10.1016/j.wear.2004.09.031

Cited by 92 publications

(45 citation statements)

References 4 publications

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“…[1][2][3][4][5] Field observations as well as laboratory test results indicate that the typical failure mode of such coating-substrate systems often is a two stage process:…”

Section: Introductionmentioning

confidence: 99%

Measurement of fracture toughness and interfacial shear strength of hard and brittle Cr coating on ductile steel substrate

Yang

Zhang

Chen

et al. 2008

Surface Engineering

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The fracture toughness and interfacial adhesion properties of a coating on its substrate are considered to be crucial intrinsic parameters determining performance and reliability of coatingsubstrate system. In this work, the fracture toughness and interfacial shear strength of a hard and brittle Cr coating on a normal medium carbon steel substrate were investigated by means of a tensile test. The normal medium carbon steel substrate electroplated with a hard and brittle Cr coating was quasi-statically stretched to induce an array of parallel cracks in the coating. An optical microscope was used to observe the cracking of the coating and the interfacial decohesion between the coating and the substrate during the loading. It was found that the cracking of the coating initiated at critical strain, and then the number of the cracks of the coating per unit axial distance increased with the increase in the tensile strain. At another critical strain, the number of the cracks of the coating became saturated, i.e. the number of cracks per unit axial distance became a constant after this critical strain. Based on the experiment result, the fracture toughness of the brittle coating can be determined using a mechanical model. Interestingly, even when the whole specimen fractured completely under an extreme strain of the substrate, the interfacial decohesion or buckling of the coating on its substrate was completely absent. The test result is different from that appeared in the literature though the identical test method and the brittle coating/ductile metal substrate system are taken. It was found that this difference can be attributed to an important mechanism that the Cr coating on the steel substrate has a good adhesion, and the ultimate interfacial shear strength between the Cr coating and the steel substrate has exceeded the maximum shear flow strength level of the steel substrate. This result also indicates that the maximum shear flow strength level of the ductile steel substrate can be only taken as a lower bound estimate on the ultimate shear strength of the interface. This estimation of the ultimate interfacial shear strength is consistent with the theoretical analysis and prediction presented in the literature.

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“…[1][2][3][4][5] Field observations as well as laboratory test results indicate that the typical failure mode of such coating-substrate systems often is a two stage process:…”

Section: Introductionmentioning

confidence: 99%

Measurement of fracture toughness and interfacial shear strength of hard and brittle Cr coating on ductile steel substrate

Yang

Zhang

Chen

et al. 2008

Surface Engineering

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“…They think this is because there is hydrogen cracking in the actual ablation. Sopok [4] believes that the hydrogenation process is that the diffusion of hydrogen in the gun steel reduces the strength and toughness of the steel, and increases the risk of cracking and brittle failure. When hydrogen is absorbed through the unoxidized crack surface, the surface energy required for crack propagation is reduced.…”

Section: Chemical Ablationmentioning

confidence: 99%

Study on Ablation Wear of Gun

Zhu¹,

Li-ping²,

Cao³

2017

Proceedings of the 2017 2nd International Conference on Materials Science, Machinery and Energy Engineering (MSMEE 2017)

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Abstract. Artillery barrels gradually ablate wear and tear in the shooting process, which reduced its internal ballistic performance and severely limited the artillery power and service life. In this paper, the mechanism of gun's ablation and wear is analyzed from three aspects: heat factor, chemical factor and mechanical factor. And the existing ablation wear problem analysis method was compared, which can provide an important reference for predicting and extending the life of the tube.

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“…High flame temperature of propellants may produce combustion gasses at temperatures as high as 3700 K. Peak gas pressure may reach up to 700 MPa. The peak bore temperature of a gun may reach up to 1800 K a few milliseconds after it is fired [1,2]. The firing process has a very strong dynamic effect on the weapon parts: most directly on the barrel, but also on the other weapon parts like the breechblock parts, the breech piece, and the recoil mechanism.…”

Section: Introductionmentioning

confidence: 99%

Abrasion Resistance of Surface-Modified Steels Used for Artillery Weapon Barrels

Jakopčić¹,

Landek²

2017

T FAMENA

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SummaryA barrel is one of the most tribologically and thermally loaded parts of artillery weapons. The influence of the salt bath nitrocarburizing and hard-chrome plating of three steels used for artillery barrels on their abrasion resistance is studied in this paper. The tested steels are 42CrMo4, 30CrNiMo8, and 36CrNiMo4 in the initial quenched and tempered state. The test results from the ''dry sand/rubber wheel'' method, after 700 m of wear path, showed that the hard-chrome plating of 42CrMo4 and 30CrNiMo8 steels improved their abrasion resistance. In addition, reduced abrasive wear of 42CrMo4 steel samples was also achieved by nitrocarburizing. Hard chrome-plated samples exhibited good wear resistance due to their greater hardness and bigger thickness of the compound zone in comparison with that obtained on nitrocarburized samples.

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Thermal–chemical–mechanical gun bore erosion of an advanced artillery system part one: theories and mechanisms

Cited by 92 publications

References 4 publications

Measurement of fracture toughness and interfacial shear strength of hard and brittle Cr coating on ductile steel substrate

Measurement of fracture toughness and interfacial shear strength of hard and brittle Cr coating on ductile steel substrate

Study on Ablation Wear of Gun

Abrasion Resistance of Surface-Modified Steels Used for Artillery Weapon Barrels

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