Study on the Explosive Characteristics of Micro/Nano-Aluminum Dust
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摘要:利用5L爆炸装置开展了铝粉粉尘爆炸实验，研究了两种不同规格微/纳米铝粉在不同点火能量、粉尘浓度下的爆炸特性。研究结果表明：点火能量增大，铝粉爆炸极限范围变大，相同的点火能量下，纳米铝粉比微米铝粉具有更大的爆炸极限范围；两种铝粉均在浓度为500g/m3、约1.2倍化学当量比浓度时具有最大的爆炸压力和压力上升速率峰值；微米铝粉中加入10%左右的纳米铝粉，可以获得最大爆炸压力和压力上升速率，分析认为纳米铝粉的加入改善了体系的反应活性，提高了粉尘爆炸剧烈程度。
Abstract:In order to investigate characteristics of damage and absorption energy for honeycomb aluminum with single cover plate structure during hypervelocity impact, the smooth particle hydrodynamic（SPH）method, Johnson-Cook constitutive model and Tillotson state equation were adopted, and three-dimension model was established by APDL procedure implanted ANSYS software using UIDL computer language. Simulations of aluminum projectile impacting honeycomb aluminum with single cover plate were performed at the same cover plate thickness, the characteristics of damage and energy absorption under different impact velocity, different incidence angles of projectile and honeycomb aluminum thicknesses were studied. Simulation results show that energy absorption effect is better with honeycomb core thickness increasing. However, impact angle has little influence on energy absorption effect of honeycomb, failure mode has some influence on energy absorption characteristics.
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