Local Composite Curing Using Expandable Pressure Media
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Solution Overview
Problem
Existing composite manufacturing processes rely heavily on autoclaves for curing, which create bottlenecks due to throughput limitations and the need for transporting materials, and are not suitable for spot or remote curing.
Innovation Solution
A system using a constraining container with an expandable medium, such as thermally activated pellets, applies pressure and heat to cure composite structures locally, eliminating the need for large autoclaves and enabling faster, cheaper, and more flexible curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If autoclave curing is used, then high-quality curing is achieved, but throughput is limited and transportation requirements increase
Solution Approach 1:
The patent divides the curing process into localized segments using multiple independent heating zones instead of requiring a single large autoclave. Each zone can be cured independently or simultaneously, eliminating the throughput bottleneck of traditional autoclave curing while maintaining quality through controlled local temperature and pressure conditions.
Solution Approach 2:
The patent applies local quality by providing differentiated heating and pressure conditions in different zones of the curing chamber. Each local region can be optimized for specific material requirements, allowing high-quality curing of diverse composite structures simultaneously without the transportation constraints of traditional autoclaves.
2Temperature
If autoclave curing is used, then controlled temperature and pressure are applied, but equipment cost and energy consumption increase
Solution Approach 1:
The curing system is divided into multiple independent heating zones, each with its own temperature and pressure control. This segmentation allows energy to be applied only where and when needed, rather than heating an entire large autoclave chamber, significantly reducing energy consumption while maintaining precise temperature control for high-quality curing.
Solution Approach 2:
The patent employs programmable temperature and pressure parameters that can be dynamically adjusted for each local zone based on material requirements. This enables optimized energy usage by applying exact necessary conditions rather than blanket high-energy treatment throughout the entire structure, reducing overall energy costs while preserving curing quality.
3Manufacturing precision
If traditional autoclave curing is used, then comprehensive curing is achieved, but flexibility for spot and remote curing is lost
Solution Approach 1:
The curing system is segmented into multiple independently controllable zones that can be activated selectively. This allows spot curing of specific areas, remote curing of hard-to-reach locations, or simultaneous curing of multiple regions, providing the flexibility needed for various application scenarios while ensuring complete and high-quality curing through programmable control of each zone.
Solution Approach 2:
The patent implements dynamic control capabilities where heating and pressure parameters can be adjusted in real-time for different zones based on curing progress and material requirements. This dynamic adaptability enables the system to handle diverse curing scenarios including spot repairs, remote locations, and complex geometries while maintaining comprehensive curing quality.
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 system achieves high-quality curing without autoclaves, reducing equipment and energy costs, allowing for smaller footprint operations and enabling on-site repairs, and supports both curing and repair outside traditional manufacturing environments.
Implementation Method 1
The expandable medium is configured to expand to a predetermined volume when a predetermined change is produced in an attribute of the expandable medium such that the expandable medium applies positive pressure to the composite structure and the cover
Implementation Method 2
The system may further comprise a heater in thermal communication with the expandable medium. The heater may be configured to be disposed within the interior volume with the expandable medium
Implementation Method 3
The system includes an expandable medium configured to be disposed within the interior volume of the constraining container between the cover and the composite structure... and curing the composite structure
Data Source
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AI summary
A system for locally curing a composite structure includes a constraining container including a cover and having an interior volume. The cover is configured to enclose a portion of a composite structure. The system includes a retainer configured to hold the cover against the composite structure. The system included an expandable medium configured to be disposed within the interior volume of the cover between the walls and the composite structure.