Sphere-Based Structural Core Layers for Non-Planar Aircraft Panels

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Honeycomb sandwich panels face challenges with complex fabrication, handling difficulties, deformation during transit, and labor-intensive reworking, especially when dealing with irregular geometries.

Innovation Solution

A panel assembly comprising a reinforcing core with a plurality of identically-dimensioned hollow spheres within a foam material, interposed between adhesive layers and composite facesheets, which can be additively manufactured and co-cured with the adhesive layers to form a lightweight, structurally durable panel.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If honeycomb sandwich panels are used to provide structural robustness, then strength is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvestructural robustnessVSAvoidfabrication complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent changes the geometric parameters of the core layer from hexagonal honeycomb cells to spherical voids with specific diameter ratios (0.6-1.2 times the honeycomb cell diameter). This parameter change maintains structural robustness while dramatically simplifying manufacturing, as spherical cores can be produced through additive manufacturing or foam injection rather than complex honeycomb fabrication processes

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent segments the core layer into discrete spherical voids embedded within a continuous foam matrix, rather than using an integrated honeycomb structure. This segmentation allows the spherical cores to be independently manufactured and then integrated into the sandwich panel, reducing overall manufacturing complexity

Inventive Principle:

Principle #1Segmentation

2Strength

If honeycomb sandwich panels are used to provide structural robustness, then strength is improved, but ease of operation deteriorates

Engineering Contradiction:

Improvestructural robustnessVSAvoidhandling ease

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The patent changes the core geometry from rigid honeycomb cells to spherical voids embedded in foam, which fundamentally alters the handling characteristics. The spherical configuration combined with foam material provides inherent flexibility and deformation resistance, making the panels easier to handle and transport without sacrificing structural robustness

Inventive Principle:

Principle #35Parameter changes

3Strength

If honeycomb sandwich panels are used to provide structural robustness, then strength is improved, but ease of repair deteriorates

Engineering Contradiction:

Improvestructural robustnessVSAvoidrework ease

Core Design Contradiction:

StrengthVSEase of repair

Solution Approach 1:

The patent segments the core into replaceable spherical elements within a foam matrix, allowing localized repair of damaged sections without requiring complex disassembly of the entire honeycomb structure. The spherical cores can be individually accessed and replaced, significantly improving ease of repair compared to integrated honeycomb panels

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the core material parameters from rigid honeycomb cells to spherical voids in foam, which allows for more flexible repair approaches. The foam matrix can be locally removed and replaced, and spherical cores can be individually substituted, making rework much easier than with traditional honeycomb structures

Inventive Principle:

Principle #35Parameter changes

4Weight of moving object

If hollow spheres are used in the reinforcing core, then weight is reduced, but manufacturing precision requirements increase

Engineering Contradiction:

Improvepanel weightVSAvoidsphere positioning precision

Core Design Contradiction:

Weight of moving objectVSManufacturing precision

Solution Approach 1:

The patent specifies optimal parameter ranges for the hollow spheres (diameters of 0.6-1.2 times the honeycomb cell diameter, wall thicknesses of 0.8-1.2 mm) that balance weight reduction with manufacturing feasibility. These parameter ranges account for typical additive manufacturing tolerances, ensuring that weight benefits are achieved without requiring excessive manufacturing precision

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces a foam matrix as an intermediary material that embeds and positions the hollow spheres. This foam intermediary absorbs positioning tolerances and ensures uniform distribution of spheres, reducing the need for high-precision sphere placement while maintaining structural integrity and weight reduction benefits

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20250303666A1Sphere-Based Structural Core Layer and Method for Use in Aircraft

Publication Date: 2025.10.02 THE BOEING CO

AI summary

Present aspects are directed to a panel assembly comprising a reinforcing core that can be incorporated into a structural panel assembly, with the panel assembly comprising a reinforcing core having a plurality of substantially identically-dimensioned hollow spheres positioned within a foam material, with the reinforcing core configured to further comprise an adhesive layer interposed between a side of the reinforcing core and a facesheet that can be a composite material facesheet.