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Performance evaluation and energy absorption mechanism of the air-blast response of three-dimensional EERC honeycomb-core sandwich panels
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DOI：10.1016/j.tws.2026.114884.png)
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Abstract
En 中文
Compared with conventional extruded 2D honeycomb cores that tend to localize collapse under impulsive loading, 3D honeycomb cores improve blast stability and mass-specific energy absorption by enabling throughthickness deformation coupling and stable progressive crushing. Accordingly, a three-dimensional elliptical-ring enhanced re-entrant circular (3D EERC) honeycomb-core sandwich panel is proposed, and its air-blast response and energy dissipation mechanisms are investigated under equal-mass constraints. A unified evaluation framework is established to enable quantitative comparison among different core topologies, and the numerical model is validated by load calibration and full-scale blast experiments. The results demonstrate a clear stage-wise response characterized by rapid front-face bending, stable progressive core crushing dominating plastic energy dissipation, and a delayed yet effectively controlled back-face deformation. Energy analyses show that the core consistently serves as the primary energy-absorbing component, contributing about 70% of the total absorbed energy and effectively attenuating impulse transmission to the back face sheet. Parametric studies indicate that charge mass, standoff distance, and core wall thickness govern the back-face response and specific energy absorption, while the semi-axis ratio a/b mainly regulates crushing localization and continuity, leading to an optimal energy absorption range with limited influence on back-face peak displacement. Under identical mass and blast loading conditions, topology comparisons confirm that the proposed EERC configuration achieves superior mass-normalized energy absorption efficiency due to its more stable progressive collapse mode and favorable energy dissipation pathway. These findings provide quantitative guidance and mechanistic insight for topology design and parameter optimization of blast-resistant sandwich structures.
Keywords:
3D EERC
Blast loading
Sandwich panels
Three-dimensional honeycomb core
Progressive crushing
Energy dissipation
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