Composite Blade Leading Edge Bonding via Intermediary Base Layer
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Solution Overview
Problem
The bonding of a metal foil to the leading edge of composite material blades for aeronautical gas turbine engines is a delicate operation, with challenges in reproducibility and adhesive distribution, leading to reduced mechanical strength and risk of delamination or loss upon impact.
Innovation Solution
A method involving successive draping of a base material and adhesive layer on a jig, transferring these layers into a metallic foil cavity, and co-firing with a fibrous reinforcement preform to ensure a bonded metal foil on the blade, improving interface continuity and positioning reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive material is applied between the metal foil and composite preform, then bonding is achieved, but uniform distribution and reproducibility are difficult to control
Solution Approach 1:
A base material layer is introduced as an intermediary between the adhesive material and the composite preform. This base layer serves as a carrier that receives the adhesive material during draping, ensuring uniform distribution before the adhesive is transferred to bond the metal foil. The intermediary layer solves the problem of difficult-to-control adhesive distribution while maintaining strong bonding.
Solution Approach 2:
The adhesive material is applied to the base material layer in advance, before the metal foil is positioned. This preliminary action allows the adhesive to be uniformly distributed on the base layer through draping operations, ensuring consistent bonding conditions before the actual assembly is formed. The base layer with pre-applied adhesive is then transferred as a complete unit to the preform.
2Reliability
If metal foil is bonded to composite blade leading edge, then protection against erosion and impact is improved, but bonding quality varies leading to delamination risk
Solution Approach 1:
The base material layer acts as an intermediary that ensures consistent adhesive distribution between the metal foil and composite preform. By applying adhesive to this intermediate layer and transferring the complete assembly, the method achieves reliable and reproducible bonding quality, eliminating the delamination risk while maintaining protection reliability.
Solution Approach 2:
The process changes the state of adhesive application from direct application to the preform to application on the base material layer. This parameter change in the application process ensures uniform adhesive distribution and consistent bonding quality, making the bonding process more reliable and reproducible while maintaining strong bonding strength.
3Strength
If adhesive layer is not uniformly distributed, then bonding quality degrades, but achieving uniform distribution is difficult
Solution Approach 1:
The base material layer serves as an intermediary carrier that simplifies adhesive application. Instead of directly applying adhesive to the complex preform surface, the adhesive is applied to the more manageable base layer, which is then draped and transferred. This intermediary approach ensures uniform adhesive distribution and high bonding quality while making the manufacturing process easier and more controllable.
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 enhances the bonding quality between the metal foil and the composite blade, reducing porosities and improving mechanical strength while ensuring precise positioning and uniform adhesive distribution, thus enhancing the blade's resistance to impact and stress.
Implementation Method 1
the co-firing of the blade preform and the first and second draped layers so as to obtain a blade made of composite material comprising on its leading edge a bonded metal foil
Implementation Method 2
a second layer of an adhesive material... the bonding of the metal foil on the leading edge of the blade made of composite material
Data Source
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AI summary
A method for manufacturing a vane from a composite material with a fitted metal leading edge comprises: - successively applying, on a template (211) of the leading edge of the vane to be manufactured, a first layer of a base material (20) and a second layer of an adhesive material (30), - transferring the first and second applied layers (20, 30) into the cavity (141) of a metal foil (140), - fitting the foil (140) comprising the first and second applied layers (20, 30) to the leading edge of a vane preform comprising a fibre reinforcement impregnated with a precursor of a matrix, - co-firing the vane preform and the first and second applied layers in order to obtain a vane of composite material comprising, on the leading edge thereof, a bonded metal foil.