项目名称: 冲击载荷作用下非均质炸药热点形成细观模拟研究
项目编号: No.11202034
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 数理科学和化学
项目作者: 刘超
作者单位: 北京应用物理与计算数学研究所
项目金额: 26万元
中文摘要: 非均质炸药热点形成机理研究既是爆轰物理关注的一项重要研究内容,也是武器及工业用固体炸药点火起爆的关键。非均质炸药热点形成过程属于典型的非线性多尺度材料动态响应问题,往往伴随着炸药颗粒变形、表面燃烧、放能及材料物理、化学性质的突变。目前尚无法通过实验和唯象理论研究对非均质炸药热点形成过程进行细致描述。近年来,离散元法的应用扩展到多晶材料冲击响应领域,并得到快速发展,为研究非均质炸药的动态响应提供了一种有效手段。本课题拟采用离散元方法,对典型非均质炸药热点形成和演化过程进行系统的细观尺度模拟研究。在数值模拟与理论分析的基础上,揭示典型炸药微结构热点形成的细观机理;确定典型微结构在不同加载条件下热点形成的主要机制。通过本项目研究,可以更真实地描述非均质炸药在细观层次上的变形和热点演化过程,为发展考虑微结构特征的爆轰计算模型提供细观力学依据,并可为其它细观尺度现象研究提供模型和方法借鉴。
中文关键词: 细观模拟;非均质炸药;热点;;
英文摘要: The investigation about hot-spot formation mechanism of heterogeneous explosives is an important research content for detonation physics, it's also the key for solid explosives ignition. The hot-spot formation process is a nonlinear multi-scale dynamic problem, coupled with grain deformation, surface burning, chemical energy release and material property change. Till now hot-spot formation process cann't be simulated aboratively by experiment or theory. Discrete element method (DEM) is used to model polymorphous material under shock loading in recent years, it provides a effective method to investigate the dynamical response of heterogeneous explosives. DEM is prepared to be used in this project, for systemically modeling hot-spot formation process of typical explosives meso-structure. Based on simulative result and theoretical analysis, the meso-mechanism of hot-spot formation in representative heterogeneous explosives will be elucidated; the main hot-spot formation mechanism of meso-structure under different shock loading will be proposed. Through this preject, the mesoscale deformation and hot-spot formation process of granular and plastic bonded explosives subjected to shock loading will be described realistically, meso-dynamical proof for meso-scope detonation model will be provided, reference for other
英文关键词: meso-scale simulation;Heterogeneous explosives;hot spot;;