Induction Consolidation for Thermoplastic Wind Blade Fabrication
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Solution Overview
Problem
Current methods for fabricating wind turbine blades from composite materials are hindered by long cycle times and large production facility requirements, necessitating a more efficient process for manufacturing lightweight and strong components.
Innovation Solution
A method involving a segmented inflatable metal mandrel wrapped with thermoplastic composite material, consolidated using induction heating and susceptor sheets within a ceramic mold, allowing for rapid fabrication of wind turbine blades without the need for extensive facility expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thermoset composite materials are used for fabricating tubular structures, then the material strength and corrosion resistance are improved, but the manufacturing cycle time increases significantly due to long cure cycles
Solution Approach 1:
The patent changes the material parameter from thermoset to thermoplastic composite, which fundamentally alters the curing mechanism. Thermoplastics do not require long chemical cure cycles like thermosets; instead, they can be consolidated through heat and pressure, reducing manufacturing cycle time while maintaining structural integrity
Solution Approach 2:
The patent replaces the chemical crosslinking process of thermoset materials with a mechanical consolidation process using thermoplastic materials. The thermoplastic fibers are bound together through heat-induced melting and compression, eliminating the need for lengthy chemical curing while achieving comparable strength
2Strength
If metal materials such as aluminum and titanium are used, then the strength-to-weight ratio is improved, but the manufacturing cost increases due to material cost and processing complexity
Solution Approach 1:
The patent employs fiber-reinforced thermoplastic composite materials that combine the high strength-to-weight ratio of metal materials with the cost advantages of polymer matrices. The composite structure achieves metallic-level strength while using more economical thermoplastic binders instead of expensive titanium or aluminum
Solution Approach 2:
The patent uses cost-effective thermoplastic materials that can be rapidly processed and consolidated, replacing expensive metal materials. The thermoplastics provide sufficient structural performance at a fraction of the material cost of titanium or aluminum, making the overall manufacturing process more economical
3Productivity
If thermoplastic composite materials are used for tubular structures, then the manufacturing cost is reduced and processing time is shortened, but the processing difficulty increases due to tooling removal and dimensional tolerance control
Solution Approach 1:
The patent divides the mandrel into multiple segmented sections that can be independently removed after consolidation. This segmentation simplifies tooling removal from the finished tubular structure and allows for easier adjustment and reconfiguration for different production runs
Solution Approach 2:
The patent designs a universal mandrel system with standardized segments and fixtures that can accommodate various tubular and non-cylindrical geometries. This multi-functional tooling approach reduces the need for custom tooling for each part type, simplifying the overall manufacturing process while maintaining tight dimensional tolerances
4Productivity
If large production facilities are built to manufacture wind turbine blades concurrently, then the production capacity is increased, but the facility size and capital investment increase
Solution Approach 1:
The patent implements a continuous manufacturing process where thermoplastic composite materials are continuously fed, consolidated, and formed into wind turbine blades. This eliminates the batch processing interruptions inherent in traditional methods, allowing multiple blades to be manufactured simultaneously in a compact facility without requiring extensive expansion
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 significantly reduces the time required to manufacture wind turbine blades, enabling increased production capacity without enlarging facilities, while maintaining the benefits of lightweight and strong thermoplastic composite materials.
Implementation Method 1
consolidating the thermoplastic composite material using at least one susceptor sheet
Implementation Method 2
using induction heating to consolidate the thermoplastic material
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A method of fabricating a thermoplastic composite tubular structure (10) for use as a wind turbine blade (10) is presented using a combination of induction heating with smart susceptors (24, 26) to consolidate a wrapped mandrel (3). The method can include overbraiding the mandrel (3) with a continuous fiber thermoplastic composite material (6) to form an overbraided mandrel (8) that is then installed in a ceramic induction oven where the mandrel (3) is pressurized internally to consolidate the thermoplastic overbraid during heating