Interlocking Polymeric Core Structure for High Strength-to-Weight Ratio
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Solution Overview
Problem
Existing cellular structures lack the necessary strength-to-weight ratio and versatility for applications requiring load-bearing capabilities, size, thickness, rigidity, and durability, particularly in constructing panels for various infrastructure and industrial uses.
Innovation Solution
The development of polymeric core structures with cells or receptacles arranged in rows and columns, featuring distinct geometries such as quadrangular, triangular, and tapered cylindrical shapes, which are symmetrical and interfitting, allowing for increased beam strength and improved adherence when laminated with additional sheets, and can be manufactured using compression molding or thermoforming processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cellular structures are made from conventional materials with simple geometries, then manufacturing is easier, but strength-to-weight ratio is insufficient
Solution Approach 1:
The patent applies curvature by designing cell walls with tapered geometries that slope inwardly from top to bottom, creating curved surfaces rather than flat planes. This curvature distributes stress more effectively throughout the structure, enhancing the strength-to-weight ratio while maintaining manufacturability through standard molding processes.
Solution Approach 2:
The patent employs composite structural design by combining multiple cell geometries (quadrangular, triangular, tapered cylindrical) within a single cellular structure. This composite approach allows optimization of different regions for specific load-bearing requirements, achieving superior overall strength-to-weight ratio compared to uniform simple geometries.
2Strength
If cells have complex three-dimensional geometries with sloping walls, then load-bearing capability improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the cell structure into distinct geometric zones: upper portions with specific wall angles, intermediate sections with transitions, and lower portions with tapered configurations. Each segment can be independently optimized and manufactured, reducing the overall precision requirement compared to a monolithic complex geometry while maintaining load-bearing performance.
Solution Approach 2:
The patent utilizes parameter changes by varying wall thickness, slope angles, and cell dimensions across different regions of the structure. These gradual parameter transitions allow the complex three-dimensional geometries to be manufactured using standard molding processes with conventional tolerances, without requiring ultra-precise manufacturing capabilities.
3Stability of the object's composition
If receptacles are arranged in dense rows and columns patterns, then structural rigidity increases, but weight increases
Solution Approach 1:
The patent applies local quality by varying the density and configuration of receptacles in different regions of the cellular structure. Areas requiring higher rigidity have denser receptacle arrangements, while regions with lower load requirements have sparser configurations. This localized optimization achieves overall structural rigidity without uniformly increasing weight throughout the entire structure.
Solution Approach 2:
The curved, tapered cell walls create more efficient stress distribution pathways that enhance rigidity per unit weight. The geometric curvature allows the structure to achieve comparable or superior rigidity with fewer and lighter receptacles compared to straight-walled cellular designs, thus reducing overall weight while maintaining structural stability.
4Area of stationary object
If cell walls slope inwardly to form floors, then surface area for adhesion increases, but manufacturing complexity increases
Solution Approach 1:
The patent merges the formation of sloping cell walls and interior floors into a single integrated molding operation. The mold cavity is designed with corresponding tapered surfaces that simultaneously create both the external cell geometry and the internal floor structures in one step, eliminating the need for separate secondary operations and reducing overall manufacturing complexity despite the increased surface area.
Solution Approach 2:
The patent uses parameter changes in the mold design, such as varying draft angles and taper ratios in different sections, to accommodate the sloping cell walls and floor formations. These controlled parameter variations allow complex adhesion surfaces to be created using standard injection molding or compression molding processes without requiring custom or overly complex tooling.
Data Source
AI summary
A molded plastic core structure acceptable to numerous uses and characterized by high structural strength to weight ratio. The structure typically comprises a two-sided array of cell-like receptacles having inwardly sloping walls that form floors. Receptacles in one side are inverted relative to receptacles in the opposite side and are inter-nested between one another to minimize the volume of plastic used. The walls and floors can be circular, square or triangular in plan view. Where square or triangular, the walls include both major and minor wall sections alternatingly interspersed with one another. Two or more core structures can be joined to one another with the receptacles of one panel being aligned with the receptacles of the joined other panel to form closed, syntactic cells that give the resulting structure high enclosed volume to surface area and weight ratios.