Fiber-reinforced composite, method therefor, and article comprising the same
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Solution Overview
Problem
Fiber-reinforced composites face challenges in achieving high mechanical strength while maintaining processability and homogenous, multi-directional material properties, especially under high stress environments, due to the need for high filler loadings which increase viscosity and reduce processability.
Innovation Solution
The development of composites with continuous fibers and aligned discontinuous agents, where magnetic particles are used to align discontinuous fibers within the substrate, allowing for improved mechanical, electrical, and thermal properties, and reducing the required magnetic field strength for alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high filler loadings of discontinuous fibers are used to achieve high mechanical strength, then the mechanical strength and resistance to plastic deformation are improved, but the viscosity of the composite increases and processability is reduced
Solution Approach 1:
The patent applies preliminary action by pre-aligning discontinuous fibers using magnetic particles and an external magnetic field before the polymer matrix sets. This pre-alignment ensures optimal fiber orientation for mechanical strength is achieved during processing, eliminating the need for post-processing alignment and maintaining both high strength and processability
Solution Approach 2:
The patent replaces traditional mechanical alignment methods (such as extrusion or rolling) with a magnetic field-based alignment system. Magnetic particles attached to discontinuous fibers respond to external magnetic fields, enabling precise alignment without mechanical stress that would increase viscosity and reduce processability
2Strength
If high filler loadings of discontinuous fibers are used to achieve high mechanical strength, then the resistance to catastrophic failure is improved, but the homogeneity and multi-directional material properties are compromised
Solution Approach 1:
The magnetic alignment process is applied preliminarily before matrix setting to ensure discontinuous fibers are uniformly distributed and oriented in multiple directions. This pre-establishment of homogeneous structure prevents clustering and ensures consistent mechanical properties throughout the composite, maintaining both strength and homogeneity
Solution Approach 2:
The patent uses magnetic particles as local quality enhancers attached to discontinuous fibers. These magnetic particles enable precise local control of fiber orientation through magnetic field application, ensuring uniform distribution and multi-directional alignment that promotes homogeneity while maintaining high filler loading for strength
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 mechanical strength, reduces stress concentrations, and improves the composite's resistance to plastic deformation and catastrophic failure, while maintaining processability and achieving isotropic properties.
Implementation Method 1
exposing the liquid to a plurality of continuous fibers defining a substrate, applying a magnetic field to the liquid to cause alignment of at least some of the plurality of discontinuous agents within the plurality of continuous fibers
Data Source
Figure 1A~2
AI summary
Disclosed herein are fiber-reinforced composites. These materials are useful in load- bearing components for mechanical systems, and other applications. Also disclosed herein are methods of making and using such composites, articles comprising the same, and the like. For example, some embodiments of the invention are generally directed to composites comprising discontinuous agents such as fibers or platelets which are positioned within a substrate, e.g., formed from a plurality of continuous fibers. In some cases, the discontinuous agents may be substantially aligned, for example, by attaching magnetic particles onto the agents and using a magnetic field to manipulate the agents. Other embodiments are generally directed to systems and methods for making or using such composites, kits involving such composites, or the like.