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关键词： Dynamic response  

摘要： Pyramidal Lattice Sandwich Panel (PLSP), a type of periodic topology with high porosity, which has broad application prospects in the modern military equipment field owing to its excellent mechanical properties such as lightweight, high strength, high specific stiffness characteristics, anti-explosive and impact resistance performance. The AlSi10Mg aluminium alloy PLSP is successfully prepared by additive manufacturing selective laser melting (SLM) to implement the drop hammer impact test, which reveals the failure mechanism and damage mode of PLSP under impact loadings. Based on the explicit finite element (FE) method, a simplified beam unit core FE model is established to simulate the dynamic responses of PLSP subjected to drop hammer impact, validity and reliability of the FE model is verified through the comparative analysis of failure modes and impact force-time curves. Then, a FE model of PLSP with the same surface density and armor steel-aluminium alloy-armor steel multi-materials for the Front face-pyramidal Core (PLC)-Back face is established, and the influences of structural parameters on impact resistance are numerically simulated based on the single variable method in terms of transient maximum Back face deflection (MaxD) and PLSP Energy Absorption (EA). The results show that impact resistance of armor steel-aluminium alloy-armor steel PLSP is significantly improved compared to that of aluminium alloy with same surface density, and the overall configuration of PLSP is basically intact. The core thickness, the core layer and the Front face thickness have great influences on impact resistance. These research results can provide theoretical basis and technical support for the designing and safety of lightweight, impact protection equipment. © 2025 Chinese Vibration Engineering Society. All rights reserved.