本文選題：離散元　切入點(diǎn)：顆粒流　出處：《振動與沖擊》2016年04期

【摘要】：利用顆粒離散單元法,研究彈丸侵徹細(xì)觀混凝土模型中彈丸受到介質(zhì)的阻應(yīng)力與侵徹速度的關(guān)系。采用蒙特卡羅法隨機(jī)生成并投放混凝土骨料且骨料的粒徑分布滿足級配曲線。通過對混凝土顆粒離散元細(xì)觀力學(xué)模型進(jìn)行單軸壓縮實(shí)驗(yàn)、巴西劈裂實(shí)驗(yàn)和雙軸壓縮實(shí)驗(yàn)的參數(shù)反演,確定細(xì)觀模型參數(shù),能使細(xì)觀混凝土模型具有和一般混凝土等效的力學(xué)性能。分析了骨料、過渡層和砂漿三相材料各細(xì)觀參數(shù)對混凝土單軸壓縮應(yīng)力應(yīng)變關(guān)系影響以及錐形彈和平頭彈彈丸直徑對侵徹阻應(yīng)力的影響。將顆粒離散元細(xì)觀力學(xué)模型方法計(jì)算的彈丸阻應(yīng)力與空腔膨脹理論計(jì)算模型相比較,表明計(jì)算離散元方法具有良好的精度和實(shí)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.

【作者單位】： 南京理工大學(xué)智能彈藥技術(shù)國防重點(diǎn)學(xué)科實(shí)驗(yàn)室;南京理工大學(xué)理學(xué)院土木工程系;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973) 國家自然科學(xué)基金(51308297)
【分類號】：TU528;TJ410
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本文編號：1704273