Skin-to-core bond line mapping for composite void detection
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Solution Overview
Problem
In aircraft composite component bonding, voids between disparate materials can lead to failure and costly waste, as traditional methods lack real-time detection and correction capabilities, resulting in the scrapping of components due to imperfections and voids exceeding tolerance limits.
Innovation Solution
A skin-to-core bond line mapping system that uses a separator film, adhesive, core, breather, layup tool, bagging material, and vacuum port to create impressions on the adhesive, allowing for iterative addition of adhesive to ensure voids meet tolerance thresholds, with sensors for real-time void detection and correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional bonding methods are used without real-time detection, then the bonding process is simple and fast, but voids exceed tolerance limits and components must be scrapped
Solution Approach 1:
The patent applies preliminary action by placing a separator film between the adhesive and core before bonding occurs. This film creates impressions in the adhesive that map the bond line geometry, allowing void detection to be performed in advance of final curing. The separator film is removed after bonding, revealing the printed bond line map that shows where voids may form, enabling corrective action before the component is completed and potentially scrapped.
Solution Approach 2:
The patent uses copying by creating a physical impression map of the bond line geometry through the separator film. The film captures the three-dimensional geometry of the bond line, including contours, ridges, and potential void locations, as a two-dimensional printed map. This copy allows inspectors to analyze bond line quality without destroying the actual bonded component, enabling non-destructive evaluation and reducing scrapping of acceptable parts.
2Reliability
If components are inspected only after final bonding, then the inspection process is simple, but defective components are discovered too late and must be scrapped
Solution Approach 1:
The separator film creates bond line impressions during the bonding process itself, enabling quality assessment to occur in advance of final curing and inspection. This preliminary mapping allows defects to be identified while the component is still in the bonding stage, not after final assembly when rework would be time-consuming or impossible.
Solution Approach 2:
The printed bond line map provides immediate visual feedback about bond line quality and potential void locations. This feedback mechanism allows operators to assess bonding quality in real-time and make corrective adjustments during the bonding process, preventing defective components from proceeding to later stages where rework would be more difficult and time-consuming.
3Manufacturing precision
If adhesive is applied generously to ensure coverage, then voids are reduced, but material waste and cost increase
Solution Approach 1:
The bond line map provides localized information about where adhesive is needed and where voids may form. This allows operators to apply adhesive with local quality - adding material precisely where the map indicates gaps or potential voids, rather than applying uniform generous coverage across the entire bond line. This targeted approach ensures adequate coverage where needed while minimizing waste in areas where adhesive is already sufficient.
Solution Approach 2:
The printed bond line map serves as feedback that guides adhesive application. By comparing the map against the actual bond line after adhesive application, operators can determine whether additional adhesive is needed in specific locations. This feedback-driven approach replaces guesswork and over-application with precise, evidence-based adhesive supplementation, reducing overall material waste while ensuring adequate coverage.
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 system reduces waste and costs by enabling in-process correction of voids, ensuring components meet specifications with minimal additional time, thereby improving the bond line quality and reducing the risk of catastrophic failures.
Implementation Method 1
a vacuum port configured to create a vacuum environment between the adhesive and the core
Data Source
AI summary
A skin-to-core bond line mapping system and method is disclosed. Layered composite components formed by “sandwiching” multiple materials together require a continuous bond between those materials with voids below particular thresholds that can vary by application. The skin-to-core bond line mapping system can include a laminate, an adhesive, a separator film, a core, a breather, a layup tool, bagging material, sealant, and a vacuum port. By employing systems and processes that layer separator film over adhesive and applying a core proximate the adhesive, a bagging material can be disposed over the materials to facilitate vacuum compaction, thereby impressing core impressions on the adhesive to map the areas between the skin and core that have good contact. An iterative process is disclosed, in which additional adhesive can be used to build the bond line until contact is made (or engineering tolerance is reached).