Nonuniform Honeycomb Core Panels for Lighter Composite Structures
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Solution Overview
Problem
Current composite structures with honeycomb cores have uniform properties due to manufacturing constraints, leading to inefficient material selection and heavier structures, as the directional nature of core material properties limits structural design and optimization.
Innovation Solution
A unitary core panel with engineered nonuniformities such as varying cell density, shape, size, and thickness, formed through material deposition, allowing for localized optimization of mechanical properties across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform honeycomb core panels are used, then manufacturing is simplified, but structural optimization is limited and weight increases
Solution Approach 1:
The patent applies local quality by varying the core cell size, shape, and/or density in different regions of the core panel to match local stress distributions. High-stress areas receive smaller, denser cells for enhanced strength, while low-stress areas use larger, sparser cells to reduce weight. This regional differentiation optimizes the overall structure without requiring complex manufacturing processes.
2Ease of manufacture
If directional core material properties are used, then manufacturing is constrained, but structural design flexibility is reduced
Solution Approach 1:
The patent employs asymmetry by intentionally creating non-uniform core structures with varying cell sizes, shapes, and orientations throughout the panel. This asymmetric design allows the core to adapt to complex, multi-directional stress patterns in the structure, providing design flexibility while maintaining compatibility with standard manufacturing processes that create ribbon-based honeycomb structures.
3Strength
If nonuniform core properties are implemented, then structural optimization improves, but manufacturing complexity increases
Solution Approach 1:
The patent implements parameter changes by systematically varying core cell parameters (size, shape, density) based on structural requirements. This allows precise control over local mechanical properties to match stress distributions, achieving optimal structural performance. The parameter variations are integrated into the manufacturing process through controlled ribbon deposition patterns, avoiding the need for complex post-processing or assembly operations.
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
Enables precise mechanical property tailoring for structural optimization, reducing material usage and manufacturing complexity, and allowing for lighter, more efficient composite structures.
Implementation Method 1
the core panel is formed via one of material deposition
Data Source
AI summary
A unitary core panel for a composite sandwich structure includes a plurality of cell walls defining a plurality of core cells, the plurality of cell walls extending across a thickness of the core, the plurality of core cells including one or more defined structural nonuniformities resulting in nonuniform properties of the core panel. A method of forming a core panel for a composite sandwich structure includes determining structural requirements of the core panel, designing the core panel to satisfy the structural requirements with one or more local nonuniformities in the core panel, and manufacturing the core panel as a unitary core panel with the one or more local nonuniformities.