Open Unit Cell Core Structure for Isotropic Impact Absorption
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Solution Overview
Problem
Existing materials used in vehicles, particularly aircraft and trucks, struggle to balance strength and weight, leading to issues such as easy bending, high fuel consumption, and inadequate impact protection, especially in multiple directions.
Innovation Solution
A core structure composed of a plurality of open unit cells with intersecting polygonal planes and open space, which can be combined with cladding layers to form lightweight components that absorb energy isotropically from any direction, featuring rigid body rotation before plastic deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If lightweight materials are used to reduce weight, then fuel efficiency is improved, but strength and impact resistance deteriorate
Solution Approach 1:
The material is segmented into a hierarchical structure with unit cells containing struts arranged in specific patterns (e.g., tetrahedral, octahedral configurations). This segmentation allows the lightweight material to maintain strength through geometric arrangement rather than material density, resolving the contradiction between low weight and high impact resistance.
Solution Approach 2:
The invention uses composite structures combining multiple materials (e.g., metal alloys, polymers, or ceramic matrices) with controlled porosity and strut arrangements. This composite approach enables the material to achieve both lightweight properties and enhanced mechanical strength, simultaneously addressing weight reduction and impact resistance requirements.
2Weight of moving object
If corrugated materials are used to save weight, then weight is reduced, but directional strength deteriorates
Solution Approach 1:
The unit cell structure employs asymmetric strut arrangements within the cell geometry, creating directional stiffness variations that prevent easy bending along any single axis. This asymmetric design within the repeating unit provides multi-directional strength while maintaining overall weight reduction, overcoming the directional weakness of conventional corrugated panels.
Solution Approach 2:
The invention transitions from two-dimensional corrugation patterns to three-dimensional unit cell structures with struts extending in multiple spatial dimensions. This dimensional enhancement provides strength in multiple directions simultaneously, resolving the directional strength limitation of planar corrugated materials while preserving weight savings.
3Weight of moving object
If honeycomb-based materials are used for aircraft, then weight is reduced, but isotropic shock absorption deteriorates
Solution Approach 1:
The material is divided into repeating unit cells containing struts arranged in isotropic configurations (e.g., tetrahedral, octahedral, or cubic patterns with equal strut lengths). This segmentation creates uniform mechanical properties in all directions, enabling the lightweight material to absorb shocks equally from any direction, overcoming the anisotropic limitation of honeycomb structures.
Solution Approach 2:
The unit cell design employs homogeneous strut arrangements with equal lengths and symmetric connectivity patterns, ensuring uniform energy absorption characteristics in all spatial directions. This homogeneity at the microstructural level translates to isotropic shock absorption behavior at the macro scale, while maintaining the weight benefits of cellular materials.
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 components provide improved crash protection and energy absorption, reducing the risk of damage to cargo and occupants by absorbing impact energy efficiently in all directions, while maintaining structural integrity and reducing weight.
Implementation Method 1
the polygonal planes of the unit cells may exhibit rigid body rotation before they or the material exhibits plastic deformation
Implementation Method 2
The plurality of open unit cells promote energy absorption by the component from any direction of impact
Data Source
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AI summary
The present invention provides lightweight components that have improved energy absorption. The components of the invention comprise a core comprising a plurality of repeats of an open unit cell. Each unit cell comprises intersecting polygonal planes of material and open space. The plurality of open unit cells promote energy absorption by the component from any direction of impact.