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Mechanical Performance of Multidirectional Buckling-Based Negative Stiffness Metamaterials: An Analytical and
Chenhui Ren1, Deqing Yang2, Haoxing Qin3
1State Key Laboratory of Ocean Engineering, Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. renchenhuicn@sjtu.edu.cn.
Materials (Basel, Switzerland)
|June 27, 2018
Summary
Buckling-based Negative Stiffness (BNS) metamaterials with curved beams offer tunable mechanical properties for shock absorption. These designs effectively reduce impact forces, preventing damage and enabling multiaxial stress resilience.
Area of Science:
- Materials Science
- Mechanical Engineering
- Metamaterials
Background:
- Negative stiffness materials exhibit unique mechanical behaviors.
- Lattice metamaterials offer tunable properties through structural design.
- Buckling phenomena can be harnessed for advanced material functionalities.
Purpose of the Study:
- To design and analyze unidirectional, bidirectional, and tridirectional Buckling-based Negative Stiffness (BNS) lattice metamaterials.
- To investigate the quasi-static and dynamic mechanical performance of these BNS metamaterials.
- To explore the influence of geometric parameters and supporting frame rigidity on material behavior.
Main Methods:
- Finite Element Analysis (FEA) models were developed to simulate mechanical performance.
- Numerical analyses systematically studied geometric parameters of curved beams, validated by theoretical solutions.
- Quasi-static compression tests and dynamic impact simulations were conducted on multilayer BNS metamaterials.
Main Results:
- FEA accurately predicted force-displacement relations, tunable via geometric parameters.
- Macroscopic performance was sensitive to the rigidity of supporting frames.
- Impact shock forces were reduced below buckling thresholds, avoiding damage.
Conclusions:
- The designed BNS metamaterials exhibit tunable negative stiffness and energy absorption.
- These metamaterials maintain functionality under multiaxial stress conditions.
- The parametric design freedom makes them suitable for shock and vibration engineering applications.
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