Abstract
Abstract This work focused on the stress response of anisotropic 30SiMn2MoVA steel gun barrel under coupled thermo-mechanical loads, namely, the contact pressure and friction of projectile, thermal load and pressure of propellant gas. The effect of temperature on the mechanical properties of gun barrel was considered. Two thermal-displacement coupled finite element models (FEM) were built by ABAQUS software. The first was the interaction model of projectile and barrel which was to calculate the stress of barrel engraved by copper jacket and steel jacket projectile. The results of barrel in the interaction model, as an initial condition, were imported to the second FEM which was applied with thermal load and pressure of propellant gas. The results show that the rifling at chamber throat has the largest stress and circumferential stress under coupled loads. It gives a request that the gun barrel should have the better circumferential mechanical properties. The plastic deformation of the rifling at the chamber throat is observed which indicates that 30SiMn2MoVA gun barrel has a low service life due to the poor mechanical properties.
Highlights
30SiMn2MoVA steel has been used for the gun barrel for many years in China
Most researchers had confirmed that 30SiMn2MoVA steel barrel processed by cold radial forging was obviously anisotropy that the circumferential mechanical properties were inferior to the axial (Liu et al, 2012)
The anisotropy should be considered in the stress analysis and design of 30SiMn2MoVA steel gun barrel
Summary
The barrel made from this material has a lower service life than expected. Most researchers had confirmed that 30SiMn2MoVA steel barrel processed by cold radial forging was obviously anisotropy that the circumferential mechanical properties were inferior to the axial (Liu et al, 2012). Xu et al (2016) reported the main reason of anisotropy was preferred orientation of crystals (texture) during the cold radial forging processing. Most of barrels are produced by cold radial forging. The anisotropy should be considered in the stress analysis and design of 30SiMn2MoVA steel gun barrel
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