Multi-function Detection Liner for Composite Manufacturing
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Solution Overview
Problem
Conventional paper liners used in prepreg manufacturing are difficult to detect using non-destructive inspection methods, leading to potential residual liner issues that can weaken composite parts and disrupt production schedules, and they lack strength to withstand resin infusion processes.
Innovation Solution
A multi-function liner with alternating conductive and insulative layers, optimized for detection through eddy-current, ultrasound, and radiograph tests, and designed to maintain structural integrity and thermal stability, using a solvent-based adhesive for bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional paper liners are used in prepreg manufacturing, then the liner can withstand heat and pressure during resin impregnation and is cost-effective, but the liner cannot be easily detected by non-destructive inspection methods and may weaken the composite part
Solution Approach 1:
The liner is constructed as a composite material system consisting of a base paper layer combined with detectable additive layers (metallic particles, fibers, or coatings). This composite structure maintains the heat and pressure resistance of paper while introducing detectability through the embedded metallic components that interact with eddy-current, ultrasound, or radiograph inspection methods.
2Ease of manufacture
If conventional paper liners are used, then manufacturing costs are reduced, but the liners lack strength to withstand the heating process and resin infusion pressure
Solution Approach 1:
The paper liner is reinforced with metallic fibers or particles distributed throughout the paper matrix, creating a composite structure that significantly enhances tensile strength and structural integrity while maintaining compatibility with resin impregnation processes and withstands heating temperatures.
Solution Approach 2:
The metallic detectable components are strategically distributed within the paper liner structure, with higher concentrations in areas requiring enhanced strength during handling and resin infusion, while maintaining overall cost-effectiveness through optimized material distribution.
3Difficulty of detecting and measuring
If metalized plastic liners are used instead of paper liners, then detectability by eddy-current methods is improved, but detection by ultrasound and radiograph methods becomes difficult and the liners are more complex
Solution Approach 1:
The liner incorporates a multi-component detectable additive system that provides universal detectability across multiple inspection methods simultaneously. The combination of metallic particles, fibers, or coatings ensures the liner can be detected by eddy-current, ultrasound, and radiograph methods, making the solution versatile for different inspection scenarios without requiring method-specific liners.
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 multi-function liner enables reliable detection and removal of residual liners, reduces manufacturing costs, and enhances the strength and durability of the liner, ensuring compliance with non-destructive inspection methods and process requirements.
Implementation Method 1
The liner includes at least one conductive layer and is detectable to eddy-current inspection tests
Implementation Method 2
The liner includes at least one insulative layer and is detectable to ultrasound inspection tests
Implementation Method 3
The resin is impregnated within the dry fibrous material by applying a heating process to melt and infuse the resin. The heating process may include temperatures of around 200 degrees Fahrenheit or more
Data Source
AI summary
A multi-function detection liner is applied to a non-cured composite material at the point of manufacturing for building a composite part. The detection liner includes a first insulative layer and a first conductive layer. The detection liner is configured to be detectable from a plurality of non-destructive inspection tests. The first insulative layer is detectable by ultrasound and radiograph within the composite part. The first conductive layer is configured to provide an eddy current signal and to enhance ultrasound attenuation of the detection liner within the composite part. Alternatively, the detection liner may include an integrated layer that combines the functions of an insulative layer and a conductive layer. The detection liner is releasably bonded to a surface of the non-cured composite material.