3D Honeycomb Foam Structure for Isotropic Stiffness
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Solution Overview
Problem
Existing lightweight structural materials, such as lattices and foams, face limitations in achieving high stiffness and efficiency due to their anisotropic properties and high production costs, which restrict their application beyond high-end industries like aviation and space.
Innovation Solution
Development of cellular geometries combining cubic and tetrahedral cell structures with varying thicknesses and geometries, allowing for the creation of unit cells and assembled structures that achieve a large portion of theoretical upper bounds for stiffness, enabling efficient use of materials and isotropic properties through direct manufacturing methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional machining techniques and bonding methods are used to fabricate complex cellular materials, then manufacturing precision can be achieved, but production cost and complexity increase significantly
Solution Approach 1:
The patent applies parameter changes by transitioning from traditional subtractive machining and bonding processes to additive manufacturing (3D printing). This fundamental process parameter change enables the direct fabrication of complex cellular geometries without requiring multiple tool passes, tool changes, or assembly operations. The additive manufacturing process inherently handles geometric complexity without increasing cost, while maintaining the manufacturing precision needed for functional cellular structures through controlled material deposition and layer-by-layer construction.
2Strength
If complex cellular geometries are fabricated using traditional methods, then structural performance can be achieved, but production time and cost increase
Solution Approach 1:
The patent applies preliminary action by using additive manufacturing to pre-form the complete complex cellular geometry in a single manufacturing step. The 3D printing process builds the entire structural framework with optimized cellular patterns before any assembly or finishing operations are needed. This eliminates the sequential addition of features through multiple tool passes or bonding operations, significantly reducing production time while maintaining the structural performance required for applications in aviation, automotive, and other industries.
3Strength
If ordered foam structures with high alignment are used, then stiffness and strength are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent applies parameter changes by utilizing additive manufacturing technology to directly fabricate ordered foam structures with high material alignment. The 3D printing process enables precise control over the orientation and arrangement of cellular walls and struts, achieving the desired material alignment for enhanced stiffness and strength without requiring complex tooling, multiple assembly steps, or specialized manufacturing equipment. The digital design files directly drive the manufacturing process, simplifying the transition from design to production of high-performance ordered foam structures.
Data Source
AI summary
What is presented is a unit cell comprising a cellular geometry that comprises cell walls and cell edges arranged into a combination of a cubic cell geometry and a tetrahedral cell geometry arranged to have a coincident central vertex. The cubic cell geometry comprises three orthogonal cell faces that intersect at its central vertex. The tetrahedral cell geometry comprises an arrangement of eight tetrahedral cells that share its central vertex such that each tetrahedral cell shares three coincident edges with three other tetrahedral cells in a cubically symmetric arrangement. The tetrahedral cell geometry is combined with the cubic cell geometry such that all vertices of the tetrahedral cell geometry are coincident with the vertices of the cubic cell geometry.