Mixed-Poisson Metamaterial Tube Structure for Impact Energy Absorption
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Solution Overview
Problem
Existing metamaterial-filled thin-walled tube structures with single-configuration metamaterials have limited energy absorption capacity due to shorter effective stroke and insufficient interaction with the tube wall, affecting their crashworthiness and energy absorption efficiency.
Innovation Solution
A thin-walled tube filled with a combination of positive Poisson ratio (PPR) and negative Poisson ratio (NPR) metamaterials, where each hole is filled with PPR or NPR strips, enhancing the coupling effect and overall impact resistance and energy absorption capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If single-configuration metamaterials (positive or zero Poisson ratio) are used to fill thin-walled tubes, then the structure achieves certain energy absorption capacity, but the effective stroke is shortened and energy absorption capacity is limited
Solution Approach 1:
The filling material is segmented into multiple strips with different Poisson ratio characteristics (positive, zero, and negative Poisson ratio strips) arranged in specific patterns within the tube. This segmentation allows different regions to contribute differently to the deformation process, extending the effective stroke while maintaining energy absorption capacity.
Solution Approach 2:
Different regions of the tube are filled with metamaterials having different local properties (different Poisson ratios). The positive Poisson ratio strips provide lateral expansion for initial energy absorption, while negative Poisson ratio strips provide lateral contraction for extended deformation. This local quality variation optimizes both effective stroke and energy absorption capacity at different stages of impact.
2Device complexity
If single-configuration metamaterials are used, then the structure achieves simplified design, but the coupling interaction with tube wall is insufficient
Solution Approach 1:
The invention changes the Poisson ratio parameter of the filling materials from uniform (single-configuration) to varied (multi-configuration with positive, zero, and negative values). This parameter change enhances the coupling interaction between filler and tube wall by creating more complex deformation patterns that engage the tube wall over a longer duration and through multiple mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The combined use of PPR and NPR metamaterials increases the average platform force, maximum compression displacement, and absorbed impact energy, improving the utilization rate and energy absorption efficiency of the thin-walled tube structure.
Implementation Method 1
thin-walled tube filled with metamaterials having mixed Poisson ratios; each hole of the thin-walled tube body is filled with the PPR filling strip or the NPR filling strip; the PPR filling strip includes a plurality of PPR cells that are connected in sequence, and the PPR cells each are prepared from a PPR metamaterial; the NPR filling strip includes a plurality of NPR cells that are connected in sequence, and the NPR cells each are prepared from an NPR metamaterial
Data Source
AI summary
The present disclosure provides a thin-walled tube filled with a mixed Poisson ratios, including at least one PPR filling strip, at least one NPR filling strip, and a thin-walled tube body with a porous structure, where each hole of the thin-walled tube body is filled with the PPR filling strip or the NPR filling strip; the PPR filling strip includes a plurality of PPR cells that are connected in sequence, and the PPR cells each are prepared from a PPR metamaterial; the NPR filling strip includes a plurality of NPR cells that are connected in sequence, and the NPR cells each are prepared from an NPR metamaterial. In the present disclosure, the thin-walled tube can simultaneously have a longer effective compression stroke of the NPR metamaterial and a higher compression force platform of the PPR metamaterial, thereby greatly improving the impact resistance and energy absorption capacity of the tube structure.