Segmented Fiber Composite Thermoforming for Complex Shapes
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Solution Overview
Problem
Fabricating composite parts with adequate strength for complex shapes using composite materials often requires significant labor and is costly, making it challenging and not always feasible.
Innovation Solution
A method involving the use of discontinuous fiber reinforced polymer sheets, where continuous fibers are sliced into strands by a pattern of slits, allowing for the formation of panels that can be thermoformed into complex shapes with improved mechanical strength and reduced labor costs, using techniques like vacuum forming and pressure application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If continuous fiber reinforced laminates are used to fabricate complex parts, then mechanical strength is improved, but labor cost and fabrication complexity increase significantly
Solution Approach 1:
The patent divides continuous fibers into discontinuous strands by introducing slits at regular intervals along the fiber length. This segmentation allows the material to be more easily handled and formed into complex shapes while maintaining adequate mechanical strength through the distributed fiber reinforcement pattern.
Solution Approach 2:
The patent modifies the physical state of the composite material by using thermoplastic matrix materials that can be heated above their glass transition or melting temperatures. This parameter change enables the material to become pliable for forming complex shapes, then solidifies upon cooling to lock in the desired geometry while maintaining structural integrity.
2Strength
If continuous fiber reinforced laminates are used for complex parts, then strength is improved, but production time and labor increase
Solution Approach 1:
By segmenting continuous fibers into discontinuous strands through slits, the material becomes more compliant and easier to form in a single operation, reducing the number of fabrication steps required while maintaining adequate strength through the distributed reinforcement pattern.
Solution Approach 2:
The patent utilizes phase transitions of thermoplastic matrix materials, heating them above their glass transition or melting temperatures to enable forming operations, then cooling to solidify the complex shape. This allows complex parts to be formed in a single cycle rather than requiring multiple steps with continuous fiber laminates.
3Ease of manufacture
If discontinuous fiber strands are used instead of continuous fibers, then ease of forming complex shapes is improved, but mechanical strength may be reduced
Solution Approach 1:
The patent compensates for the potential strength reduction from using discontinuous fibers by utilizing parameter changes in the thermoplastic matrix material. By heating above transition temperatures and applying pressure during forming, the material achieves adequate consolidation and fiber-matrix bonding, then cooling locks in the strength properties of the formed part.
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 enables the production of composite parts with properties similar to those made from continuous fiber reinforced laminates, offering sufficient strength and reduced cycle times while minimizing wrinkling and labor costs, facilitating the fabrication of complex parts efficiently.
Implementation Method 1
heating a thermoplastic material above a glass transition or melting temperature of the material
Implementation Method 2
heating a thermoplastic material above a glass transition or melting temperature of the material
Implementation Method 3
applying a vacuum pressure to the material while in the pliable state to force the material to conform to a shape of a mold
Implementation Method 4
applying an atmospheric pressure to the material while in the pliable state to force the material to conform to a shape of a mold
Implementation Method 5
cooling the material to lock in a formed, three-dimensional shape
Data Source
AI summary
Briefly, a variety of embodiments of composite materials including part fabrication using composite materials is described.