高应变率下弹道明胶的本构模型研究
Study of Constitutive Model of Ballistic Gelatin at High Strain Rate
查看参考文献24篇
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文摘
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为了更好地进行枪弹和破片终点效应的数值模拟工作,综述了弹道明胶物理性质的实验研究现状;分析了应变率相关超弹性本构模型和流体弹塑性本构模型的特点,结合相关实验数据推导得到了弹道明胶的状态方程系数;进行了球形杀伤元高速侵彻弹道明胶的实验,并建立了对应的有限元模型;两种不同本构模型得到的数值结果与实验数据的对比表明,在高应变率下流体弹塑性本构模型能更好地模拟弹道明胶响应。弹道明胶虽然是一种应变率敏感材料,但在高应变率下由高压导致的材料可压缩性占主导,其物理响应可以用一定形式的动载本构关系(流体弹塑性本构)予以近似。 |
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其他语种文摘
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In order to numerically simulate the terminal effect of bullet and fragment, the research status of ballistic gelatin physical properties is summarized firstly. The features of rate-dependent hyperelastic model and elastic-plastic hydrodynamic model are studied, respectively. The coefficients of equation of state of ballistic gelatin are concluded based on related experiments. The penetration of a steel sphere into a block of ballistic gelatin is studied experimentally, and is modeled using the finite element method. The comparison of the computed and experimental results shows that the elastic-plastic hydrodynamic model can simulate the experiment more accurately at high velocity impact. Ballistic gelatin is known as a rate-dependent sensitively material, but the thermal softening is dominant at high strain rate, the physical behavior can be modeled with a dynamical constitutive. |
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来源
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兵工学报
,2014,35(1):128-133 【核心库】
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DOI
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10.3969/j.issn.1000-1093.2014.01.019
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关键词
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兵器科学与技术
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弹道明胶
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应变率
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流体弹塑性
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数值模拟
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地址
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1.
南京理工大学机械工程学院, 江苏, 南京, 210094
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南京理工大学理学院, 江苏, 南京, 210094
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-1093 |
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学科
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力学 |
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文献收藏号
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CSCD:5078286
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