Honeycomb Core Construction with Permeable Connection Layer
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Solution Overview
Problem
Existing honeycomb core constructions in sandwich components face challenges in replicating three-dimensional structures and are limited in further processing due to adhesive obstacles, leading to material waste and reduced strength, especially when trying to create complex shapes or bond dissimilar cores.
Innovation Solution
A honeycomb core construction featuring at least two cores with a gas-permeable connection layer that is adhesive-bonded only at the web ends, allowing air diffusion and pressure equalization, enabling flexible processing and reinforcement of the core ends for improved surface quality and dissimilar core properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a planar honeycomb core is pressed to create three-dimensional shapes, then the desired complex geometry is achieved, but the strength of the honeycomb core is reduced
Solution Approach 1:
The honeycomb core is divided into multiple planar layers that are stacked to form three-dimensional structures. Each layer maintains its structural integrity independently, allowing complex geometries to be achieved through layer stacking rather than pressing a single core, thus preserving strength while achieving desired shapes.
Solution Approach 2:
The connection between honeycomb layers is achieved through adhesive bonding at web ends, creating a composite structure that combines the mechanical strength of the honeycomb material with the bonding strength of adhesives. This composite approach maintains overall structural strength while enabling three-dimensional configuration.
2Strength
If adhesive is applied to the entire connection layer to bond honeycomb cores, then strong bonding is achieved, but further processing such as downstream shaping is obstructed
Solution Approach 1:
Adhesive is applied only at the web ends of the honeycomb cores rather than across the entire connection layer. This localized application provides sufficient bonding strength at critical locations while leaving the majority of the connection layer free and accessible for subsequent processing operations such as downstream shaping.
Solution Approach 2:
The adhesive bonding is segmented to occur only at discrete locations (web ends) rather than as a continuous layer. This segmentation allows the connection layer to remain partially accessible for further processing while still achieving the necessary bonding function at critical points.
3Shape
If honeycomb cores are cut to create regions of lesser thickness, then the desired thickness variation is achieved, but significant cutting waste is created
Solution Approach 1:
Instead of cutting a single honeycomb core to create thickness variations, the structure is segmented into multiple planar layers of uniform thickness that are stacked in different configurations. This allows desired thickness variations to be achieved through selective layer placement and arrangement, eliminating the need for material removal and thus preventing cutting waste.
Solution Approach 2:
The problem of creating thickness variations is solved by transitioning from a two-dimensional cutting approach to a three-dimensional stacking approach. By varying the number and arrangement of layers in different regions, desired thickness profiles are achieved without material removal, converting a subtractive process into an additive assembly process.
4Stability of the object's composition
If air is trapped in the cavities between webs of honeycomb cores, then the internal structure is sealed, but pressure equalization between cores is prevented
Solution Approach 1:
The connection layer is designed with porous or permeable characteristics that allow air and other gases to pass through while maintaining structural integrity. This porous structure enables pressure equalization between honeycomb cores by allowing gas diffusion through the connection layer, while still providing adequate bonding at the web ends.
Solution Approach 2:
The connection layer serves as an intermediary between honeycomb core cavities, providing a controlled pathway for gas exchange. Rather than completely sealing or completely opening the connection, the intermediate layer mediates between these extremes, allowing selective gas permeability that enables pressure equalization while maintaining structural connectivity.
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
This solution allows for the creation of high-quality, three-dimensional sandwich components with enhanced strength and surface finish, enabling the use of dissimilar cores for varied functional properties, such as specific strength and deformability, while minimizing material waste and facilitating complex geometries.
Implementation Method 1
a medium such as air that is trapped in the cavities between the webs of the honeycomb cores may diffuse through the connection layer, on account of which an equalization of pressure between the honeycomb cores is also enabled
Data Source
AI summary
A honeycomb core construction that includes at least two honeycomb cores and a connection layer that is disposed between the honeycomb cores. The connection layer is configured so as to be gas-permeable, and has an adhesive for adhesively bonding to the honeycomb cores only in a region of the webs of the honeycomb cores.