Contoured Composite Repair Tool for Warping Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Repairing damage to fiber-reinforced polymer structures is complicated, time-intensive, and expensive, with conventional scarf repair techniques often resulting in warping due to pressure and heat.
Innovation Solution
A method involving a repair tool formed by applying a first and second facesheet, with a core layer sandwiched between, that conforms to the shape of the contoured surface, allowing for precise repair without warping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If conventional scarf repair techniques are used to repair fiber-reinforced polymer structures, then the structural abnormality can be replaced, but the contoured surface warps due to pressure and heat
Solution Approach 1:
A repair tool is fabricated in advance that precisely replicates the contoured surface geometry. This tool is then applied during repair to maintain the surface contour while the repair proceeds, preventing warping caused by heat and pressure.
Solution Approach 2:
The repair tool acts as an intermediary between the repair process and the contoured surface. It transfers and distributes heat and pressure uniformly, preventing localized deformation while still enabling the repair of structural abnormalities.
2Ease of repair
If conventional repair techniques are used, then the structural abnormality can be addressed, but the repair process becomes complicated and time-intensive
Solution Approach 1:
The repair tool is fabricated beforehand with the exact contour of the surface, allowing for a streamlined repair process. This preliminary preparation eliminates time-consuming adjustments during the actual repair and enables faster replacement of structural abnormalities.
3Reliability
If pressure and heat are applied during repair, then the uncured repair structure can be cured, but the contoured surface warps
Solution Approach 1:
The repair tool serves as a mediator that distributes heat and pressure uniformly across the repair area. This uniform distribution cures the repair structure effectively while preventing the localized thermal and mechanical stresses that cause warping of the contoured surface.
Solution Approach 2:
The repair tool is pre-fabricated to precisely match the contoured surface geometry, creating a controlled environment for curing. This preliminary preparation ensures that heat and pressure are applied uniformly during curing, preventing warping while achieving reliable cure of the repair structure.
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 timely, cost-effective, and contour-preserving repairs of composite structures by using a repair tool that maintains the structural integrity and shape of the repaired area.
Implementation Method 1
curing the uncured repair structure
Implementation Method 2
adhering a second facesheet to the core layer
Data Source
AI summary
Disclosed herein is a method of repairing a contoured composite structure. The method includes applying a first facesheet, a core layer, and a second facesheet onto a contoured composite structure to form a repair tool. The method further includes removing the repair tool from the contoured surface of the contoured composite structure. After removing the repair tool from the contoured surface of the contoured composite structure, the method includes replacing a structural abnormality of a contoured composite structure with an uncured repair structure. The method also includes applying the repair tool onto the contoured composite structure such that the repair tool overlays the uncured repair structure. The method additionally includes curing the uncured repair structure when the repair tool is applied onto the contoured composite structure over the uncured repair structure.