Composite Rod Preforms for Wind Turbine Blade Stabilization
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Solution Overview
Problem
Conventional methods for manufacturing composite structures, such as wind turbine blades, face challenges including deformations like wrinkles and warping during the curing process, limited stiffness and strength, and difficulties in controlling rod spacing and tension, leading to reduced performance and increased costs.
Innovation Solution
The system involves preform layers of multiple elongate rods aligned longitudinally, coupled using an adhesive-free mechanical union, and knitted into a lightweight textile architecture to maintain precise alignment and allow for greater shear deformation, enabling the creation of high-strength composite beams with improved stability and conformability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional composite fabrication processes are used, then manufacturing is simpler, but the stiffness, strength and fatigue life of structural blade components are limited to less than ideal levels
Solution Approach 1:
The composite structure is divided into multiple preform layers, each containing multiple elongate rods arranged in a grid pattern. Each rod is a separate element that can be independently positioned and coupled, allowing the structure to achieve high stiffness and strength through the collective arrangement of segmented elements rather than using a single complex component.
Solution Approach 2:
The invention uses composite preform layers combining rods made of different materials (such as fiberglass, carbon fiber, or other reinforcement materials) with matrix materials. This multi-material composite approach enables the structural blade components to achieve superior stiffness, strength, and fatigue life by leveraging the complementary properties of different materials in a coordinated arrangement.
2Stability of the object's composition
If rods are closely spaced to enhance stabilization, then wrinkle prevention improves, but manufacturing precision becomes difficult to control
Solution Approach 1:
The rods are pre-positioned in a predetermined grid pattern within each preform layer before the lamination process. The couplings are pre-formed to establish fixed spacing relationships between adjacent rods. This preliminary arrangement of rods at precise intervals provides stabilization while maintaining controllable manufacturing precision, as the spacing is determined during preform fabrication rather than during final assembly.
Solution Approach 2:
Couplings are introduced as intermediary elements between adjacent rods. These couplings serve as mediators that maintain predetermined spacing relationships and transmit forces between rods. The couplings enable precise control of rod spacing by acting as standardized connectors with fixed dimensions, thereby facilitating manufacturing precision while achieving close spacing for effective stabilization.
3Strength
If adhesives are used to bind rod to non-woven veil, then bonding strength improves, but interlaminar shear is reduced and shelf life decreases
Solution Approach 1:
The invention extracts and eliminates the adhesive bonding step from the traditional rod-to-veil attachment process. Instead of using adhesives that compromise interlaminar shear and have limited shelf life, the rods are directly integrated into the preform layers through mechanical coupling and structural integration with the non-woven veil, achieving bonding strength through friction and mechanical interlocking rather than chemical adhesion.
Solution Approach 2:
The invention replaces perishable adhesives with durable mechanical couplings that have indefinite shelf life. The couplings are designed as robust mechanical elements that maintain bonding strength without degrading over time, eliminating the six-month or less shelf life limitation imposed by adhesive perishability while maintaining or improving interlaminar shear properties.
4Shape
If material is sheared to conform to mold, then fit to mold improves, but rod collision occurs due to shear deformation
Solution Approach 1:
The preform layers are designed with controlled flexibility that allows dynamic adjustment during molding. The grid arrangement of rods with couplings creates a structure that can undergo controlled deformation to conform to mold geometry while maintaining rod alignment. The couplings are designed to accommodate necessary deformations without causing rod collision, enabling the material to adapt to mold shape while preserving structural integrity.
Data Source
AI summary
Structurally enhanced preformed layers of multiple rigid unidirectional rods are constructed and arranged for use in fabricating load-bearing support structures and reinforcements in a variety of composite components, e.g. wind turbine blades. Individual preform layers include multiple elongate unidirectional strength elements or rods arranged in a single layer along a longitudinal axis of the preform layer. Individual rods include aligned unidirectional structural fibers embedded within a matrix resin such that the rods have a substantially uniform distribution of fibers and high degree of fiber collimation. The relative straightness of the fibers and fiber collimation provide rods and the preform layers with high rigidity and significant compression strength. A plurality of rods are loosely attached, e.g. knitted, together with a coupling that allows for each rod to be axially displaced. e.g. slideable, relative to another rod.