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Constitutive model of viscoelastic dynamic damage for the material of gas obturator in modular-charge howitzer

DEFENCE TECHNOLOGY 2024年第9期39卷 203-216页

作者： Li, Zhonggang Chen, Longmiao Li, Yifan Jia, Yufeng Zhang, Quan Nanjing Univ Sci & Technol Sch Mech Engn Nanjing 210094 Peoples R China Shanxi North Machine Bldg Co Ltd Technol Ctr Taiyuan 030009 Peoples R China Kelong New Mat Technol Co Ltd Res & Dev Dept Xianyang 712000 Peoples R China

In order to investigate the mechanical response behavior of the gas obturator of the breech mechanism, made of polychloroprene rubber (PCR), uniaxial compression experiments were carried out by using a universal testing machine and a split Hopkinson pressure bar (SHPB), obtaining stress-strain responses at different temperatures and strain rates. The results revealed that, in comparison to other polymers, the gas obturator material exhibited inconspicuous strain softening and hardening effects; meanwhile, the mechanical response was more affected by the strain rate than by temperature. Subsequently, a succinct viscoelastic damage constitutive model was developed based on the ZWT model, including ten undetermined parameters, formulated with incorporating three parallel components to capture the viscoelastic response at high strain rate and further enhanced by integrating a three-parameter Weibull function to describe the damage. Compared to the ZWT model, the modified model could effectively describe the mechanical response behavior of the gas obturator material at high strain rates. This research laid a theoretical foundation for further investigation into the influence of chamber sealing issues on artillery firing. (c) 2024 China Ordnance Society. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://***/ licenses/by-nc-nd/4.0/).

关键词： Breech mechanism gas obturator Polychloroprene rubber Constitutive model Strain rate Damage STRAIN RATES WIDE-RANGE POLYMERS BEHAVIOR PRESSURE

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