Annular Composite Ply Forming With Pivoted Feed and Tension Control
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Solution Overview
Problem
Fabricating fiber-reinforced composite structures with complex shapes, such as annular or curved structures, is challenging due to difficulties in achieving desired strength and weight characteristics, often resulting in defects like wrinkles and requiring costly, time-consuming processes.
Innovation Solution
A method and apparatus for forming composite structures with varying geometries, including an annular shape, using a forming tool and a material feed assembly that can pivot relative to the tool, applying plies of material with offset fibers and controlled tension to conform to the tool's surface, and curing the material to form the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If hand lay-up process is used to fabricate annular-shaped composite structures, then the structures can be formed with complex shapes, but the process is costly and time-consuming with less than desired results
Solution Approach 1:
The forming tool is pre-configured with the desired complex annular shape and surface features before material application. The tool includes pre-designed variable radius sections and transition zones that guide the material conforming process, eliminating the need for time-consuming manual shaping operations during fabrication.
Solution Approach 2:
The forming process uses dynamic tensioning and manipulation of plies during material application. The system adjusts tension forces and manipulation techniques in real-time based on the specific geometric requirements of different tool sections, enabling automated conforming to complex shapes while maintaining productivity.
2Shape
If plies are manipulated and stretched to achieve certain shapes, then the desired shape can be formed, but wrinkles and waves are created that weaken the structure
Solution Approach 1:
The forming tool features locally optimized surface geometry with variable radii of curvature designed to match the specific requirements of different structural zones. Transition zones are carefully engineered to gradually change curvature, preventing sudden geometric changes that would cause wrinkling while maintaining the desired overall shape.
Solution Approach 2:
The system controls material application parameters including tension forces, layup speed, and ply orientation angles to match the local geometric parameters of the tool surface. By dynamically adjusting these parameters according to the variable radius sections, the process achieves smooth conforming without wrinkles while preserving structural integrity.
3Shape
If darting or cutting plies is done to conform to desired shape, then the shape can be achieved, but the performance and structural characteristics are degraded
Solution Approach 1:
The forming tool is pre-designed with the exact desired shape and surface features, including all transitions and curvature variations. This preliminary configuration allows continuous plies to be laid up without interruption or cutting, as the tool geometry itself guides the material conforming process from the outset.
Solution Approach 2:
The automated material feed system continuously applies plies in an unbroken sequence along the entire tool surface. The process maintains continuous fiber paths without interruptions from darting or cutting operations, ensuring uninterrupted load paths and optimal structural performance throughout the composite structure.
4Shape
If conventional fabrication processes are used for complex curved structures, then the structures can be formed, but defects like wrinkles are created that require costly and time-consuming processes to correct
Solution Approach 1:
The automated material application system incorporates feedback control that monitors ply placement quality in real-time. Sensors detect potential wrinkling or defects during the layup process and automatically adjust tension forces, layup speed, or material application parameters to prevent defect formation, ensuring high manufacturing precision for complex curved shapes.
Solution Approach 2:
The forming tool surface is pre-configured with the exact desired geometry including all curvature transitions and surface features. This preliminary design prevents the formation of wrinkles and defects by providing a guide that naturally directs the material conforming process, eliminating the need for costly post-processing corrections.
Data Source
AI summary
Methods of forming a composite structure include conforming at least one ply of material to a forming surface of a tool having differing features. Apparatuses for forming a composite structure include a forming tool and a material feed assembly configured to hold a supply of material, where the material feed assembly may be configured to pivot the supply of material relative to the forming tool. Composite structures having an at least partially annular shape are formed by an at least partially automated process.