Composite Filament Network for Stability and Weight Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Composite structures face challenges in achieving stability and functionality due to the need for increased filament lengths, volume of short filaments, or binder amounts, which can lead to increased thickness, areal weight, and negative impacts on mechanical performance and cost.
Innovation Solution
A filament network comprising discontinuous filaments of varying lengths and types, including polymeric, stiff, and functional materials, is used to form a composite structure with a resin binding, allowing for improved stability and functionality while maintaining low areal weight and thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If filament lengths are increased to achieve veil stability, then stability is improved, but thickness and areal weight increase
Solution Approach 1:
The veil is segmented into multiple layers with different filament length characteristics. The first veil layer contains longer filaments that provide structural stability and interpenetration, while the second veil layer contains shorter filaments that reduce overall thickness. This segmentation allows each layer to contribute differently to the overall performance, achieving stability without excessive thickness increase.
Solution Approach 2:
Different regions of the veil structure are assigned different filament length qualities. The first veil layer uses longer filaments (e.g., 3-6mm) in specific locations where interpenetration and stability are critical, while the second veil layer uses shorter filaments (e.g., 1-3mm) in regions where thickness reduction is prioritized. This local differentiation optimizes the balance between stability and thickness.
2Stability of the object's composition
If volume of short filaments is increased to achieve veil stability, then stability is improved, but areal weight increases
Solution Approach 1:
The veil structure is divided into two layers with different filament volume distributions. The first layer contains a higher volume of longer filaments that provide stability with lower areal weight, while the second layer contains shorter filaments that fill gaps and enhance stability without adding excessive weight. This segmented approach optimizes the weight-stability tradeoff.
Solution Approach 2:
The veil is constructed as a composite of two different veil layers with distinct filament characteristics. The first layer uses longer filaments with lower areal weight, while the second layer uses shorter filaments that complement the first layer. This composite structure achieves enhanced stability through the synergistic combination of different filament types rather than simply increasing the volume of a single filament type.
3Stability of the object's composition
If amount of binder is increased to achieve veil stability, then stability is improved, but mechanical performance deteriorates
Solution Approach 1:
The invention extracts and eliminates the binder component from the veil structure entirely. Instead of using binder to hold filaments together, the veil layers are bonded through direct interpenetration of filament ends into the underlying fiber bundle and through mechanical interlocking between layers. This extraction of the binder eliminates its negative impact on mechanical performance while maintaining stability through the interpenetrating filament architecture.
Solution Approach 2:
The filament ends themselves act as intermediaries between the first and second veil layers, replacing the need for binder. The protruding filament ends from the first layer penetrate into the second layer and interlock with the shorter filaments, creating a mechanical bond without requiring any binder material. This intermediary mechanism maintains stability while preserving mechanical performance.
4Adaptability or versatility
If additional surface modifiers are used to impart functional characteristics, then functionality is improved, but cost and mechanical performance deteriorate
Solution Approach 1:
The veil structure is designed to be multi-functional through its layered architecture rather than through additional modifiers. The first veil layer with longer filaments provides structural stability and interpenetration functionality, while the second veil layer with shorter filaments provides surface protection and resin absorption functionality. This universal design achieves multiple functions (structural integrity, surface protection, resin management) without requiring separate functional modifiers, thereby reducing cost and complexity.
Data Source
AI summary
A composite structure includes a number of fiber layers. Each fiber layer of the number of fiber layers includes a fiber bundle and a filament layer at least partially covering the fiber bundle. The filament layer includes discontinuous filaments. The discontinuous filaments include at least one of different length filaments, including first length filaments and second length filaments. The first length filaments include a first length and the second length filaments include a second length. The first length is different than the second length. The discontinuous filaments include at least one of different type filaments, including first type filaments and second type filaments. The first type filaments include a first material composition. The second type filaments include a second material composition. The first material composition is different than the second material composition. The composite structure includes a resin binding the number of fiber layers together.