Pre-heated Projections for Composite Joining
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Solution Overview
Problem
Existing methods for joining a part to a composite component often result in fiber breakage and distortion due to the high viscosity of the matrix material, requiring the entire composite component to be heated, which is inefficient and can cause microstructure damage.
Innovation Solution
Pre-heating projections before insertion into a composite component with a matrix material, using a fixture to conduct heat and apply controlled insertion force, while monitoring temperature and force to maintain optimal viscosity reduction and prevent damage, allowing for localized heating and minimal fiber disruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the entire composite component is heated to reduce matrix viscosity for projection insertion, then the matrix material viscosity is reduced allowing easier insertion, but the entire composite component is heated causing energy waste and potential microstructure damage
Solution Approach 1:
The patent applies local heating only to the projection regions rather than heating the entire composite component. The heating device targets specific locations where projections need to be inserted, reducing energy consumption while achieving the required matrix softening locally at the insertion points.
Solution Approach 2:
The heating process is segmented into discrete localized heating zones corresponding to individual projection insertion points. Rather than uniform heating of the whole component, heat is applied in separate, controlled regions where needed, minimizing energy waste and avoiding unnecessary heating of other composite areas.
2Productivity
If high insertion force is applied to push projections through the composite component, then the projections are successfully inserted, but fiber breakage and distortion occur reducing mechanical properties
Solution Approach 1:
The matrix material is pre-heated at the projection insertion points before the projections are inserted. This preliminary heating softens the matrix in advance, creating a more compliant environment that reduces the insertion force needed and prevents fiber damage during the projection insertion process.
Solution Approach 2:
The physical state of the matrix material is changed by heating, transforming it from a rigid, high-viscosity state to a softer, more pliable state. This parameter change in the matrix material allows projections to be inserted with lower force while maintaining fiber integrity and achieving successful insertion.
3Manufacturing precision
If the matrix material viscosity is reduced by heating for better projection consolidation, then consolidation quality improves, but the entire composite component is heated which is inefficient
Solution Approach 1:
Heating is applied locally only to the regions where projections need to be consolidated, rather than heating the entire composite component. This localized approach achieves the required matrix softening for proper consolidation while significantly improving heating efficiency and reducing energy consumption.
Solution Approach 2:
The heating process is divided into separate localized zones corresponding to individual projection consolidation points. Each zone receives heat independently and only when needed, avoiding unnecessary heating of other areas and improving overall process efficiency while maintaining consolidation 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
This method reduces fiber breakage and distortion, improves mechanical properties of the joint, and efficiently consolidates the projections without heating the entire composite component, ensuring better load transfer and reduced risk of microstructure damage.
Implementation Method 1
the projections are pre-heated by applying heat to the body so that the body conducts the heat to the projections
Implementation Method 2
The projections locally heat the matrix material of the composite component as they are pushed into the composite component. This locally reduces viscosity of the matrix material
Data Source
AI summary
A first aspect of the invention provides a method of joining a part to a composite component, the composite component comprising fibres impregnated with a matrix material, and the part comprising a plurality of projections, the method comprising: inserting the projections into the composite component; and pre-heating the projections before they are inserted into the composite component, so that the projections are at a higher temperature than the composite component as they are inserted into the composite component. The projections locally heat the matrix material of the composite component as they are pushed into the composite component. Increased temperature during insertion is advantageous as the reduced matrix viscosity, due to the increased temperature of the matrix, results in better consolidation of the fibres around the projections and minimises the distortion of the fibres. The composite component is only heated locally where heating is required, which removes the need to heat the entire composite component.