[1] Hong Jun, Shen Yue, Li Jianxing, Wang Xiao, et al. Discrete element analysison press and fracture mechanism of propellant grain [J]. Journal of Southeast University (English Edition), 2019, 35 (3): 359-366. [doi:10.3969/j.issn.1003-7985.2019.03.012]
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Discrete element analysison press and fracture mechanism of propellant grain(
)
发射药粒挤压破碎机理离散元分析
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 35
- Issue:
- 2019 3
- Page:
- 359-366
- Research Field:
- Mathematics, Physics, Mechanics
- Publishing date:
- 2019-09-30
Info
- Title:
- Discrete element analysison press and fracture mechanism of propellant grain
- 发射药粒挤压破碎机理离散元分析
- Author(s):
- Hong Jun, Shen Yue, Li Jianxing, Wang Xiao
- Jiangsu Key Laboratory of Engineering Mechanics, Southeast University, Nanjing 211189, China
- PACS:
- O347.7
- DOI:
- 10.3969/j.issn.1003-7985.2019.03.012
- Abstract:
- To analyze fracture mechanism of propellant grain and study the mechanical properties of propellant grain, the press and fracture processes of propellant grain with and without initial defects are modeled using the discrete element method. On the basis of the appropriate constitutive relationships, the discrete element model of the propellant grain was established. Compared with experimental measurements, the micro-parameters of the bonded-particle model of the propellant grain under unconfined uniaxial compression tests were calibrated. The propellant grains without initial defects, with initial surface defects, and with initial internal defects were studied numerically through a series of unconfined uniaxial compression tests. Results show that the established discrete element model is an efficient tool to study the press and fracture processes of the propellant grain. The fracture process of the propellant grain without initial defects can be divided into the elastic deformation phase, crack initiation phase, crack stable propagation phase, and crack unstable propagation phase. The fracture mechanism of this grain is the global shear failure along the direction of the maximum shear stress. Initial defects have significant effects on both the fracture mechanism and peak strength of the propellant grain. The major fracture mechanism of the propellant grain with initial surface defects is local shear failure, whereas that of the propellant grain with initial internal defects is global tensile failure. Both defects weaken the peak strengths of the propellant grain. Therefore, the carrying and filling process of the propellant grain needs to minimize initial defects as far as possible.
- 为分析发射药粒的破坏机理, 研究发射药粒的力学性能, 采用离散元法对有无初始缺陷的发射药粒挤压破碎过程进行了数值研究.选择合适的本构关系, 建立了发射药粒的离散元模型.对比发射药粒单轴压缩物理试验和数值试验, 标定了发射药粒颗粒离散模型的细观参数.对无初始缺陷、表面初始缺陷以及内部初始缺陷的发射药粒进行了单轴压缩数值试验研究.研究结果表明, 建立的发射药粒离散元模型能有效地模拟发射药粒挤压破碎过程.无初始缺陷的发射药粒破碎过程分为弹性变形阶段、裂纹萌生阶段、裂纹稳定扩展阶段和裂纹失稳扩展阶段, 其破碎机理为沿着最大切应力方向的整体剪切破坏.初始缺陷对发射药粒的破碎机理和峰值强度均有显著影响, 具有表面初始缺陷的发射药粒的破碎机理以局部剪切破坏为主, 而内部初始缺陷以整体拉伸破坏为主, 两类初始缺陷的存在均削弱了发射药粒的峰值强度.发射药粒运输和装填过程中应尽量减少初始缺陷.
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Memo
- Memo:
-
Biography: Hong Jun(1978—), male, doctor, associate professor, junhong@seu.edu.cn.
Foundation items: The National Key Research and Development Program of China(No.2018YFD1100401-04), the National Natural Science Foundation of China(No.11772091), the Priority Academic Program Development of Jiangsu Higher Education Institutions(No.CE01-2), the Open Research Fund Program of Jiangsu Key Laboratory of Engineering Mechanics(No.LEM16A08).
Citation: Hong Jun, Shen Yue, Li Jianxing, et al. Discrete element analysis on press and fracture mechanism of propellant grain[J].Journal of Southeast University(English Edition), 2019, 35(3):359-366.DOI:10.3969/j.issn.1003-7985.2019.03.012.