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VAM-Based Equivalent Cauchy Model for Accordion Honeycomb Structures with Zero Poisson's Ratio.
Yuxuan Lin1,2, Mingfang Chen1,2, Zhenxuan Cai1,2
1School of Civil Engineering, Chongqing University, Chongqing 400045, China.
Materials (Basel, Switzerland)
|August 14, 2025
Summary
This study introduces a 3D model to predict accordion honeycomb behavior, validated by experiments. The model shows geometric factors influence mechanical properties, offering insights for material design.
Area of Science:
- Materials Science
- Mechanical Engineering
- Computational Mechanics
Background:
- Cellular materials, like accordion honeycombs, exhibit unique deformation behaviors.
- Predicting the mechanical response of these complex structures is crucial for their application.
Purpose of the Study:
- To develop and validate a three-dimensional equivalent Cauchy continuum model (3D-ECM) for accordion honeycombs.
- To investigate the influence of geometric parameters on the mechanical properties of accordion honeycombs.
Main Methods:
- Development of a 3D-ECM using the variational asymptotic method (VAM).
- Validation through quasi-static compression experiments on 3D-printed specimens.
- Comparison with detailed 3D finite element simulations (3D-FEM).
Main Results:
- The 3D-ECM accurately predicts the mechanical response, showing strong correlation with experimental and FEM data.
- Parametric analyses identified re-entrant angle, ligament-to-strut ratio, and thickness ratios as key factors influencing elastic moduli.
- Accordion honeycombs demonstrate superior dimensional stability and tunable stiffness compared to other Poisson's ratio structures, though with lower energy absorption.
Conclusions:
- The developed 3D-ECM is a reliable tool for analyzing accordion honeycomb mechanics.
- Geometric optimization is feasible for tailoring mechanical performance.
- Accordion honeycombs are promising for applications requiring structural reliability and tunable stiffness.
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