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

Defence Technology（防务技术） 2024年第9期39卷 203-216页

作者： Zhonggang Li Longmiao Chen Yifan Li Yufeng Jia Quan Zhang School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China Technology Center Shanxi North Machine-building Co.Ltd.Taiyuan 030009China Research and Development Department Kelong New Material Technology Co.Ltd.Xianyang 712000China

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.

关键词： Breech mechanism Gas obturator polychloroprene rubber Constitutive model Strain rate Damage

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Studies on Physical Chemistry of rubber-Rice Husk Ash Composites

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Journal of Renewable Materials 2019年第2期7卷 171-192页

作者： V.Subrahmanian M.Albert Noble Einstien Department of rubber and Plastics Technology Anna UniversityMIT CampusChrompetINDIA 60044 Master of Technology Rubber and Plastics DepartmentAnna UniversityMIT Campus

Nowadays an alternate source of filler from renewable and plant derivatives are being thought of in rubber industries due to their reliability,environmental and economic *** Husk Ash(RHA)a byproduct of the rice milling industry is obtained on partial and as well as full combustion of the rice *** ash is a good source of silica,silicates and needle shaped carbon and hence can be used as filler for *** the present study,a detailed investigation was carried out to understand the RHA as reinforcing material using mechanical properties and fractography using *** rubbers studied were natural rubber(NR),poly chloroprene(CR)and ethylene propylene diene monomer(EPDM).Interestingly,the RHA added NR stock on open mill mixing generated considerable amount of static *** properties of NR were found to be as good as regular *** compounds behaved well during *** the properties were found to be ***-RHA compounds were found to result in higher viscosity and the properties were not as *** SEM studies showed surprisingly cohesive failure as evidenced with the presence of flow lines and the fibrous filler(RHA)remains embedded in the matrix regardless of the chemistry of the repeating unit,NR,EPDM and the chlorine containing monomer inCR.

关键词： Rice husk ash rubber composites natural rubber polychloroprene rubber EPDM Mooney Scorch SEM fractography

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