Composite Pressure Vessel Adhesion via Vacuum Bag Priming
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Solution Overview
Problem
Existing lightweight pressure vessels face challenges with poor adhesion between the metal liner and the overwrap layer due to variable bearing pressures during the wet winding process, leading to potential buckling failure and reduced fatigue life, especially under high-pressure conditions.
Innovation Solution
A method involving the application of an adhesive layer on the metal liner, treated with a vacuum bag for secure adhesion, followed by a consistent application of the overwrap layer using a breather cloth and heat curing to ensure uniform pressure and improved bonding between the liner and the overwrap layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If wet winding process is used to apply overwrap layer, then lightweight composite structure is achieved, but adhesion between liner and overwrap layer is poor due to variable bearing pressures
Solution Approach 1:
A primer layer is applied to the metal liner surface before applying the overwrap layer. This preliminary action prepares the surface to ensure proper adhesion and prevents buckling failure by creating a reliable bonding interface between the liner and the composite overwrap layer.
Solution Approach 2:
The primer layer acts as an intermediary substance between the metal liner and the polymer matrix of the overwrap layer. This intermediate layer improves adhesion by chemically or physically bonding to both surfaces, eliminating the poor adhesion caused by variable bearing pressures during wet winding.
2Weight of moving object
If thin metal liner is used to reduce weight, then weight is reduced, but buckling failure risk increases under high pressure
Solution Approach 1:
The vessel uses a composite structure combining a thin metal liner with a polymer matrix overwrap layer reinforced with filaments. This composite construction allows the thin liner to maintain low weight while the composite overwrap provides the necessary buckling resistance and strength under high pressure conditions.
Solution Approach 2:
The primer layer is applied in advance to the thin metal liner surface, creating a bonded interface that prevents buckling failure. This preliminary protective action allows the thin liner to withstand high pressures without buckling by distributing stresses through the bonded composite structure.
3Reliability
If adhesive layer is applied and vacuum bagged before overwrap, then adhesion is enhanced, but manufacturing complexity increases
Solution Approach 1:
The primer application and overwrap layer application are merged into a single manufacturing sequence. The primer is applied first, then the overwrap layer with polymer matrix is wound over it in the wet winding process, and both are cured together. This merging reduces manufacturing complexity while maintaining enhanced adhesion through the primer layer.
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 approach enhances the adhesion between the metal liner and the overwrap layer, reducing the risk of buckling failure and increasing the fatigue life of the pressure vessel by ensuring a consistent and high-strength bond, even under high-pressure conditions.
Implementation Method 1
The adhesive layer treated with a vacuum bag in order to secure the adhesive to the outer surface of the liner
Implementation Method 2
heat curing to ensure uniform pressure and improved bonding between the liner and the overwrap layer
Implementation Method 3
the filamentary material adheres to the adhesive layer forming an overwrap layer on the outer surface of the metal liner
Data Source
AI summary
A pressure vessel for containing materials under elevated pressures includes a metal liner and an adhesive layer, applied to the outer surface of the metal liner, where the adhesive layer is treated with a vacuum bag in order to secure the adhesive to the outer surface of the liner. An overwrap layer is applied on top of the adhesive on the outer surface of the metal liner, where the overwrap layer is formed by winding a filamentary material around the liner, such that the filamentary material adheres to the adhesive forming an overwrap layer on the outer surface of the metal liner, forming the pressure vessel.