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<p>Addressing the issue of brittle failure in honeycomb structures under compressive loads, this paper proposes a local stiffness enhancement method for fundamental honeycomb unit cells. Regular hexagonal and concave hexagon cells are selected and applied symmetrically or asymmetrically to the base honeycomb units. Through quasi-static compression experiments and finite element simulations, we demonstrate that symmetric local stiffness enhancement achieves a remarkable 203.8% improvement in specific energy absorption compared to the unenhanced structure. Enhancements near the horizontal symmetry axis significantly increase stiffness and load-bearing capacity, with the optimal configuration (Z25%) exhibiting up to 382.6% higher peak load capacity than the baseline model (Z75%). Asymmetric local stiffness enhancement effectively reduces stress concentration while increasing load-bearing capacity. Analysis of the shape-matching effects between the base cell and enhancement structure reveals that coupling via Poisson's ratio effects interaction of outward expansion and inward compression extends the structural plateau stage and enhances load-bearing capacity. Thank you for your valuable suggestions. We appreciate the reviewer's suggestion. The abstract has been revised to focus more concisely on the research purpose, principal results, and major conclusions. The background information has been streamlined to avoid redundancy. Specifically, the ZN-type configuration (regular hexagon base with concave hexagon enhancement) increases load-bearing capacity by 22.9%. Examination of the layer-by-layer progressive deformation mechanism in multilayer structures maximizes both energy absorption capacity and load-bearing performance. These findings provide significant insights for designing lightweight, high-strength structures where energy absorption and load-bearing capacity are critical, especially in aerospace and automotive applications.</p>

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Mechanical behavior of multilayer structures with local stiffness enhancement

  • 期刊论文

  • 发表日期：

    2025年8月2日

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  • Jiawei Yan,
  • Qingtian Deng,
  • Xinbo Li

摘要

Addressing the issue of brittle failure in honeycomb structures under compressive loads, this paper proposes a local stiffness enhancement method for fundamental honeycomb unit cells. Regular hexagonal and concave hexagon cells are selected and applied symmetrically or asymmetrically to the base honeycomb units. Through quasi-static compression experiments and finite element simulations, we demonstrate that symmetric local stiffness enhancement achieves a remarkable 203.8% improvement in specific energy absorption compared to the unenhanced structure. Enhancements near the horizontal symmetry axis significantly increase stiffness and load-bearing capacity, with the optimal configuration (Z25%) exhibiting up to 382.6% higher peak load capacity than the baseline model (Z75%). Asymmetric local stiffness enhancement effectively reduces stress concentration while increasing load-bearing capacity. Analysis of the shape-matching effects between the base cell and enhancement structure reveals that coupling via Poisson's ratio effects interaction of outward expansion and inward compression extends the structural plateau stage and enhances load-bearing capacity. Thank you for your valuable suggestions. We appreciate the reviewer's suggestion. The abstract has been revised to focus more concisely on the research purpose, principal results, and major conclusions. The background information has been streamlined to avoid redundancy. Specifically, the ZN-type configuration (regular hexagon base with concave hexagon enhancement) increases load-bearing capacity by 22.9%. Examination of the layer-by-layer progressive deformation mechanism in multilayer structures maximizes both energy absorption capacity and load-bearing performance. These findings provide significant insights for designing lightweight, high-strength structures where energy absorption and load-bearing capacity are critical, especially in aerospace and automotive applications.