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
The relationship between the penetration resistance and the velocity of penetrator in the process of projectile penetrating meso-scale concrete model is studied in this paper using the particle flow discrete element method. Concrete aggregates, whose sizes distribute according to the grading curve are randomly generated and placed according to the Monte Carlo method. In order to get the same effective mechanical properties as the macro-scale model, the parameters of the micro-scale model is determined by applying the parameter inversion technique to the uniaxial compression, splitting tensile, and biaxial compression tests using the particle flow discrete element micromechanical model. The influence of the aggregate, transition layer and mortar 3 phase material microscopic parameters on concrete response with respect to uniaxial compression strength as well as resistance stress on projectile with flat and conical nose are analyzed. The comparison of the numerical result of resistance stress calculated by the particle flow discrete element micromechanical model with the analytical result based on the cavity expansion theory shows that discrete element model has a good applicability and accuracy.
关键词
离散元 /
颗粒流 /
细观模型 /
混凝土 /
侵彻
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Key words
Discrete Element /
Particle flow /
Meso-scale model /
Concrete /
Penetration
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