Ribbon Laminate Adhesion Structure for Cylindrical Honeycomb Cores
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Solution Overview
Problem
Existing methods for shaping a honeycomb core into a cylindrical structure result in saddle-shape deformation and reduced shear stiffness due to bent cell walls when extended to arbitrary radii.
Innovation Solution
A ribbon laminated body composed of multilayer ribbons bonded with low- and high-temperature curing adhesives, where the low-temperature adhesive is trapezoidal and partially peeled off during extension, allowing the honeycomb core to maintain its shape and shear stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a honeycomb core is extended to a cylindrical shape using a trapezoidal adhesion portion, then the honeycomb core can be shaped into a cylindrical form, but bent portions are generated in the cell wall surface and shear stiffness is decreased
Solution Approach 1:
The adhesion portion is divided into multiple layers: a first adhesion portion (trapezoidal shape) and a second adhesion portion (rectangular shape extending beyond the first). This segmentation allows the trapezoidal portion to guide cylindrical shaping while the extended rectangular portion prevents cell wall bending and maintains shear stiffness.
Solution Approach 2:
Different regions of the adhesion portion are given different functions: the first adhesion portion (trapezoidal) is optimized for enabling cylindrical shaping, while the second adhesion portion (extended rectangular region) is optimized for maintaining structural integrity and preventing cell wall deformation. This local differentiation resolves the contradiction between shape formation and strength preservation.
2Strength
If the adhesion portion size is increased to prevent cell wall deformation, then shear stiffness is maintained, but the honeycomb core cannot be extended to arbitrary radius cylindrical shapes
Solution Approach 1:
The adhesion portion is segmented into a first portion that determines the cylindrical radius (trapezoidal first adhesion portion) and a second portion that maintains structural strength (extended second adhesion portion). This allows independent optimization: the first portion enables arbitrary radius shaping while the second portion ensures shear stiffness is maintained.
Solution Approach 2:
The adhesion portion extends in the radial dimension beyond what would be required for basic cylindrical shaping. This additional radial extension provides the extra adhesive area needed to prevent cell wall deformation while still allowing the core to be formed to arbitrary radii through the trapezoidal geometry of the first adhesion portion.
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
The method enables the honeycomb core to be extended to a desired cylindrical shape without deforming sideways, retaining shear stiffness and preventing bent cell walls, thus maintaining structural integrity.
Implementation Method 1
a low-temperature curing adhesion portion constituted by a low-temperature curing adhesive
Implementation Method 2
a high-temperature curing adhesion portion constituted by a high-temperature curing adhesive that is cured at a temperature higher than a temperature at which the low-temperature curing adhesive is cured
Data Source
AI summary
A ribbon laminated body used for creating a honeycomb core is constituted by a plurality of layers of ribbons laminated, a low-temperature curing adhesion portion, and a high-temperature curing adhesion portion. A low-temperature curing adhesion portion adhesively bonds adjacent ribbons, and a high-temperature curing adhesion portion is in contact with both ribbons. At a portion where the low-temperature curing adhesion portion is in contact with a ribbon, the shape of the low-temperature curing adhesion portion is a trapezoidal shape, wherein an upper base is overlapped with a part of one long side of the ribbon, and a lower base is overlapped with a part of the other long side of the ribbon. At a portion where the high-temperature curing adhesion portion is in contact with the ribbon, a part of a periphery of the high-temperature curing adhesion portion is in contact with an oblique side a low-temperature curing adhesion portion.