基于颗粒流离散元模型的弹丸侵彻细观混凝土数值模拟方法研究

发布时间：2018-04-03 07:52

  本文选题：离散元　切入点：颗粒流　出处：《振动与冲击》2016年04期

【摘要】：利用颗粒离散单元法,研究弹丸侵彻细观混凝土模型中弹丸受到介质的阻应力与侵彻速度的关系。采用蒙特卡罗法随机生成并投放混凝土骨料且骨料的粒径分布满足级配曲线。通过对混凝土颗粒离散元细观力学模型进行单轴压缩实验、巴西劈裂实验和双轴压缩实验的参数反演,确定细观模型参数,能使细观混凝土模型具有和一般混凝土等效的力学性能。分析了骨料、过渡层和砂浆三相材料各细观参数对混凝土单轴压缩应力应变关系影响以及锥形弹和平头弹弹丸直径对侵彻阻应力的影响。将颗粒离散元细观力学模型方法计算的弹丸阻应力与空腔膨胀理论计算模型相比较,表明计算离散元方法具有良好的精度和实用性。
[Abstract]:Using particle discrete element method of projectile penetrating projectile in meso concrete model by medium resistance stress and penetration velocity. Randomly generated and put on the concrete aggregate and aggregate by Monte Carlo method of particle size distribution satisfies the grading curve. Based on the concrete particle discrete element micromechanics model for uniaxial compression experiments Brazil, splitting parameter inversion experiments and biaxial compression experiments, determine the meso parameters, can make the meso concrete model with general concrete and equivalent mechanical properties. The analysis of aggregate, transition layer and mortar three-phase material the microscopic parameters of concrete uniaxial compression stress-strain relationship and the effect of conical shells and flat nose projectile diameter on the penetration resistance of stress resistance. The projectile particle discrete element micromechanics model method to calculate the stress and cavity expansion theory comparison calculation model, show that the meter The computational discrete element method has good accuracy and practicability.

【作者单位】： 南京理工大学智能弹药技术国防重点学科实验室;南京理工大学理学院土木工程系;
【基金】：国家重点基础研究发展计划(973) 国家自然科学基金(51308297)
【分类号】：TU528;TJ410
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本文编号：1704273