Discontinuous Fiber Composite Manufacturing with Controlled Orientation
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Solution Overview
Problem
High-cost and limited applicability of continuous fiber reinforced composites due to manufacturing costs and difficulty in forming shapes with sharp bends or contours, along with poor mechanical properties of discontinuous fiber composites, hinder their adoption in high-volume markets and applications.
Innovation Solution
A method for producing composite materials using discontinuous fibers in a thermoplastic polymer matrix that minimizes fiber length attrition and aligns fibers for improved mechanical properties, enabling the creation of composite sheets and laminates with enhanced strength, stiffness, and formability, suitable for high-volume production and use of recycled fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If continuous fibers are used in composite materials, then mechanical strength and stiffness are improved, but manufacturing cost increases and difficulty in forming shapes with sharp bends or contours increases
Solution Approach 1:
The patent divides continuous fibers into discontinuous segments (chopped fibers) of controlled length (0.25-2 inches). This segmentation allows the composite to be manufactured using cheaper thermoplastic matrices and simpler processing methods while maintaining adequate mechanical properties through optimized fiber length and orientation control during processing.
Solution Approach 2:
Instead of using continuous fibers and accepting high cost and formability limitations, the patent inverts the approach by using discontinuous fibers with controlled length and orientation. This inversion enables the use of thermoplastic matrices and standard manufacturing processes, achieving cost reduction while maintaining formability and adequate mechanical properties.
2Ease of manufacture
If discontinuous fibers are used in composite materials, then manufacturing cost decreases and formability improves, but mechanical strength and stiffness deteriorate
Solution Approach 1:
The patent changes critical parameters including fiber length (0.25-2 inches), fiber orientation (controlled during processing), and matrix type (thermoplastic). These parameter changes optimize the balance between manufacturing cost and mechanical strength, achieving adequate load transfer and mechanical properties while maintaining cost effectiveness and formability.
Solution Approach 2:
The patent applies local quality by controlling fiber orientation in different regions of the composite. Fibers are aligned in the direction of principal stress through controlled processing, creating local anisotropy that maximizes mechanical strength where needed while maintaining overall cost effectiveness and formability.
3Shape
If discontinuous fibers are used in composite materials, then formability and cost are improved, but fiber alignment and load transfer capability worsen
Solution Approach 1:
The patent applies preliminary action by controlling fiber orientation during the processing stage before final product formation. Fibers are aligned in the desired direction through controlled processing methods, ensuring optimal load transfer capability is established before the composite is formed into its final shape, thereby maintaining both formability and mechanical strength.
Data Source
AI summary
The invention relates to compositions comprising composite materials comprised of discontinuous fibers and one or more polymers and/or oligomers. The invention relates to methods of making the same. The composite materials can be in the form of compositions, composite sheets, laminates, pellets, and/or shaped composite products.