How sand filling affects the dynamic response of metallic corrugated sandwich beams under shock loading was characterized, both experimentally and numerically, with shock loading simulated by high-speed impact of aluminum foam projectiles at beam mid-span. To facilitate evaluating the effects of sand filling, both empty and sand-filled corrugated core sandwich beams were assessed and compared for shock resistance. Representative deformation processes, deformation and failure modes, and beam deflections were experimentally obtained and analyzed. Sand-filled sandwich beams exhibited much higher shock resistance than the empty ones. Numerical simulations were subsequently conducted using a coupled discrete particle/finite element approach that takes into account the coupling interaction between the sand grains and corrugation members. The simulations predicted reasonably well the primary features (permanent mid-span deflections and deformation modes) of both the empty and sand-filled sandwich beams observed experimentally. The validated numerical model was employed to evaluate how the properties of the filling sand and other granular filling materials, e.g., density, stiffness, friction and damping, affect the shock resistance of sandwich beams. The results indicated that the shock resistance was sensitive to, firstly, the density and stiffness of sand and, secondly, the friction between sand particles. In contrast, the damping between sand particles had little effect.

通过实验和数值分析，研究了沙粒填充如何影响金属波纹夹心梁在冲击载荷下的动力响应，并通过梁中跨上铝泡沫射弹的高速冲击来模拟冲击载荷。为了便于评估充砂的效果，对空芯和充砂瓦楞芯夹心梁进行了评估，并比较了其抗冲击性。通过实验获得并分析了代表性的变形过程，变形和破坏模式以及梁的挠度。充满沙子的夹心梁的抗震性要比空的高。随后使用耦合的离散颗粒/有限元方法进行了数值模拟，该方法考虑了沙粒与波纹构件之间的耦合相互作用。这些模拟合理地预测了实验观察到的空夹层和夹砂夹层梁的主要特征（永久中跨挠度和变形模式）。经过验证的数值模型用于评估填充砂和其他颗粒状填充材料的特性（例如密度，刚度，摩擦和阻尼）如何影响夹层梁的抗冲击性。结果表明，抗冲击性首先对砂的密度和刚度敏感，其次对砂粒之间的摩擦敏感。相反，砂粒之间的阻尼作用很小。经过验证的数值模型用于评估填充砂和其他颗粒状填充材料的特性（例如密度，刚度，摩擦和阻尼）如何影响夹层梁的抗冲击性。结果表明，抗冲击性首先对砂的密度和刚度敏感，其次对砂粒之间的摩擦敏感。相反，砂粒之间的阻尼作用很小。经过验证的数值模型用于评估填充砂和其他颗粒状填充材料的特性（例如密度，刚度，摩擦和阻尼）如何影响夹层梁的抗冲击性。结果表明，抗冲击性首先对砂的密度和刚度敏感，其次对砂粒之间的摩擦敏感。相反，砂粒之间的阻尼作用很小。