Among the intrinsic properties of some materials, e.g., foams, porous materials, and granular materials, are their ability to mitigate shock waves. This paper investigated shock wave mitigation by a sandwich panel with a granular core. Numerical simulations and experimental tests were performed using Autodyn hydro-code software and a shock tube, respectively. The smoothed particle hydrodynamics (SPH) method was used to model granular materials. Sawdust and pumice, whose properties were determined by several compression tests, were used as granular materials in the sandwich panel core. These granular materials possess many mechanisms, including compacting (e.g., sawdust) and crushing (e.g., pumice) that mitigate shock/blast wave. The results indicated the ineffectiveness of using a core with low thickness, yet it was demonstrated to be effective with high thickness. Low-thickness pumice yielded better results for wave mitigation. The use of these materials with a core with appropriate core reduces up to 88% of the shock wave. The results of the experiments and numerical simulations were compared, suggesting a good agreement between the two. This indicates the accuracy of simulation and the ability of the SPH method to modeling granular material under shock loading. The effects of grain size and the coefficient of friction between grains have also been investigated using simulation, implying that increasing the grain size and coefficient of friction between grains both reduce overpressure.

在一些材料（例如泡沫、多孔材料和颗粒材料）的固有特性中，它们具有减轻冲击波的能力。本文研究了通过具有颗粒芯的夹​​层板减轻冲击波。数值模拟和实验测试分别使用 Autodyn Hydro-code 软件和冲击管进行。平滑粒子流体动力学 (SPH) 方法用于模拟颗粒材料。锯屑和浮石的特性由多次压缩试验确定，被用作夹芯板芯中的颗粒材料。这些粒状材料具有许多机制，包括减轻冲击波/冲击波的压实（例如，锯末）和压碎（例如，浮石）。结果表明使用低厚度的芯是无效的，然而，它被证明对高厚度是有效的。低厚度的浮石在减缓波浪方面产生了更好的结果。将这些材料与具有适当核心的核心一起使用可减少高达 88% 的冲击波。将实验和数值模拟的结果进行了比较，表明两者之间具有良好的一致性。这表明模拟的准确性和 SPH 方法在冲击载荷下模拟颗粒材料的能力。还使用模拟研究了晶粒尺寸和颗粒之间的摩擦系数的影响，这意味着增加晶粒尺寸和颗粒之间的摩擦系数都可以降低超压。将这些材料与具有适当核心的核心一起使用可减少高达 88% 的冲击波。将实验和数值模拟的结果进行了比较，表明两者之间具有良好的一致性。这表明模拟的准确性和 SPH 方法在冲击载荷下模拟颗粒材料的能力。还使用模拟研究了晶粒尺寸和颗粒之间的摩擦系数的影响，这意味着增加晶粒尺寸和颗粒之间的摩擦系数都可以降低超压。将这些材料与具有适当核心的核心一起使用可减少高达 88% 的冲击波。将实验和数值模拟的结果进行了比较，表明两者之间具有良好的一致性。这表明模拟的准确性和 SPH 方法在冲击载荷下模拟颗粒材料的能力。还使用模拟研究了晶粒尺寸和颗粒之间的摩擦系数的影响，这意味着增加晶粒尺寸和颗粒之间的摩擦系数都可以降低超压。