Repairing Contoured Composite Panels via Single-Sided Patch
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Solution Overview
Problem
Existing methods for repairing composite-material panels, particularly those with contoured or curved surfaces like aircraft airfoils, are inefficient and costly due to the difficulty in accessing damaged areas from only one side, often requiring complete panel replacement.
Innovation Solution
A method involving the identification of damaged areas, removal of a sector to form a void, insertion of a flexible patch, and affixing a shaped core, followed by tapering and repair ply installation, allowing for effective repair from a single accessible surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional repair methods are used on contoured composite panels, then repair accessibility is improved, but complete panel replacement is required which increases cost and time
Solution Approach 1:
The repair process is segmented into distinct stages: damage assessment, void formation, patch insertion, core attachment, and tapering. This segmentation allows each step to be optimized independently, enabling efficient single-sided repair operations on contoured panels without requiring complete panel replacement
Solution Approach 2:
The invention transitions from traditional two-sided access repair to single-sided access repair by working entirely from the exterior surface. The shaped core and flexible patch system enables three-dimensional repair construction through a two-dimensional aperture, eliminating the need for interior surface access
2Loss of time
If contoured panels are repaired from a single accessible surface, then repair time is reduced, but structural integrity may be compromised
Solution Approach 1:
The shaped core is specifically designed with an outer contour that corresponds to the vertex region, providing localized structural support exactly where needed. The flexible patch is sized to overlap the aperture periphery by at least 0.5 inches on all sides, ensuring adequate structural reinforcement while maintaining repair efficiency
Solution Approach 2:
The repair system combines multiple materials with complementary properties: flexible patch material for sealing and structural reinforcement, shaped core material for void filling and contour restoration, and adhesive for bonding. This composite approach ensures structural integrity is maintained while enabling single-sided repair access
3Reliability
If complete panel replacement is performed, then structural reliability is ensured, but cost and productivity are negatively impacted
Solution Approach 1:
Instead of replacing the entire panel, only the damaged sector is removed to form a void. This extraction approach allows the repair to be localized to the specific damaged area while maintaining the integrity and functionality of the remaining panel structure, significantly reducing repair time and cost
Solution Approach 2:
The shaped core is designed to replicate the original panel contour and geometry in the damaged region. By creating a custom-shaped replacement that matches the original vertex region geometry, the repair restores both structural integrity and aerodynamic shape without requiring complete panel replacement
Data Source
AI summary
A method for repairing damage caused to a curved composite-material panel may include removal of a sector including through-thickness damage, installation of a patch performed from an exterior side of the panel, buildup of the void caused by removal of the sector, and installation of one or more composite repair plies.