Continuous Fiber Rib-and-Sheet Compression Molding
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Solution Overview
Problem
Existing rib-and-sheet structures made from chopped fibers in composite materials exhibit inferior mechanical properties due to random fiber orientation and adhesive bonding processes, which are time-consuming and inefficient.
Innovation Solution
The use of continuous, aligned fibers in a compression molding process to create rib-and-sheet structures, either through a two-step or one-step process, where the rib is molded directly with a sheet or laminate, enhancing material properties and reducing processing time by eliminating adhesive bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If chopped fibers are used in composite rib-and-sheet structures, then the manufacturing process is simpler, but the mechanical properties (strength and stiffness) are inferior
Solution Approach 1:
The patent changes the fiber configuration parameter from chopped/random to continuous/aligned, which fundamentally improves mechanical properties. This parameter change is achieved through specialized molding techniques that maintain fiber alignment during the manufacturing process, resolving the contradiction between manufacturing ease and mechanical performance.
Solution Approach 2:
The patent employs composite materials with continuous aligned fibers arranged in specific architectures (rib-and-sheet structures) to achieve superior mechanical properties. The composite structure combines different fiber orientations and material compositions to optimize both strength and manufacturability.
2Productivity
If adhesive bonding is used to join rib and sheet, then the manufacturing process is flexible, but the processing time is increased
Solution Approach 1:
The patent merges the rib and sheet manufacturing steps into a single integrated molding process. Instead of separately manufacturing components and bonding them with adhesives, the entire rib-and-sheet structure is formed in one compression molding operation, eliminating the bonding step and reducing total processing time while maintaining manufacturing flexibility.
Solution Approach 2:
The patent performs preliminary arrangement of continuous fiber preforms in the desired rib-and-sheet configuration before the molding process. This preliminary positioning ensures that fibers are correctly oriented and placed before consolidation, enabling the single-step manufacturing process to produce the final structure without additional bonding operations.
3Strength
If continuous aligned fibers are used instead of chopped fibers, then the mechanical properties are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent changes the fiber state parameter from chopped to continuous aligned, which improves mechanical properties. The specialized molding process is designed to handle continuous fiber preforms and maintain their alignment throughout consolidation, achieving superior material properties through controlled parameter changes during manufacturing.
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
The resulting rib-and-sheet structures demonstrate improved mechanical properties, including higher strength and stiffness, and significant time savings compared to traditional adhesive-based methods.
Implementation Method 1
subjecting, in a first mold, the assemblage to heat that is sufficient to melt the first polymer resin, and pressure, thereby consolidating the assemblage
Implementation Method 2
subjecting, in a first mold, the assemblage to heat that is sufficient to melt the first polymer resin, and pressure, thereby consolidating the assemblage
Implementation Method 3
cooling the consolidated first material and the consolidate assemblage, thereby forming a rib-and-sheet part
Data Source
AI summary
Rib-and-sheet structures include a rib comprising continuous, aligned fibers. The rib is fabricated via compression molding from continuous, aligned fiber, thereby providing an aligned, continuously reinforced rib. In one embodiment, rib-and-sheet structures are produced in a two-step compression-molding process, wherein a near net-shape rib is molded, in a first mold, from fiber-bundle based preforms, and then a rib-and-sheet part is molded by placing, in a second mold, the rib with either: (i) a preformed sheet, (ii) plies that form a laminate/sheet or (iii) chopped fibers that form a sheet during the molding process. In another embodiment, rib-and-sheet structures are fabricated in a one-step compression-molding process, wherein fiber-bundle-based preforms and (i) a preformed sheet, (ii) plies that form a laminate/sheet, or (iii) chopped fibers are combined in a single mold and molded in a single step.