Fibrous Fabric Winding Support With Dynamic Compaction Against Wrinkling
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Solution Overview
Problem
Existing methods for manufacturing composite material parts using fibrous fabrics result in wrinkling defects due to overlengths generated during compaction, which deteriorate the mechanical strength of the parts.
Innovation Solution
A tooling system with a motion device to adjust the shape of the support and compaction devices to manage overlengths by sequentially compacting end and central regions, ensuring the desired fibre volume fraction and minimizing wrinkling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If compaction is performed on the wound fabric to increase the fibre volume fraction, then the desired fibre volume fraction is achieved, but overlengths are generated causing wrinkling defects
Solution Approach 1:
The support is divided into multiple end regions that can be independently positioned along the second axis. This segmentation allows different zones of the wound fabric to be compacted at different times and with different pressures, preventing the generation of overlengths that cause wrinkling while achieving the desired fibre volume fraction.
Solution Approach 2:
The support structure is made dynamic by enabling the end regions to be gradually drawn closer or further apart during the winding and compaction process. This dynamic adjustment allows the support to adapt to the fabric's behavior during compaction, eliminating overlengths and preventing wrinkling defects while maintaining the desired fibre volume fraction.
2Ease of manufacture
If the support shape is kept fixed during winding, then the winding process is simple, but overlengths accumulate causing fabric wrinkling
Solution Approach 1:
The support transitions from a fixed structure to a dynamic one where end regions can be repositioned during the winding process. This dynamic capability allows the support to compensate for fabric behavior changes, preventing overlength accumulation and wrinkling while maintaining manufacturing simplicity through automated control.
Solution Approach 2:
The geometric parameters of the support, specifically the distances between end regions along the second axis, are changed during the winding and compaction process. This parameter adjustment allows the support to adapt to the fabric's dimensional changes, preventing overlengths and wrinkling while keeping the process manageable through controlled modifications.
3Manufacturing precision
If the distance between end regions is reduced during winding, then overlengths are compensated, but the support structure becomes more complex
Solution Approach 1:
The support is segmented into multiple independently positionable end regions, allowing localized adjustments in distance along the second axis. This segmentation enables precise control of overlengths in different zones without requiring complex global restructuring of the entire support framework.
Solution Approach 2:
The motion device serves multiple functions: it positions end regions during winding, controls compaction timing, and adjusts support geometry dynamically. This multi-functionality reduces the need for separate complex mechanisms, managing overall device complexity while achieving precise overlength control.
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 system effectively reduces and eliminates wrinkling defects, achieving a fibrous preform with the desired fibre volume fraction and improved mechanical strength.
Implementation Method 1
a motion device configured to modify the shape of the support between a retracted configuration and an extended configuration by gradually drawing the end regions closer or further apart along the second axis
Implementation Method 2
Compaction of the wound fabric is therefore carried out to reduce the thickness of each of the layers, and thereby increase the fibre volume fraction to the desired value
Data Source
AI summary
A tooling for winding a fibrous fabric on a support, allowing gradual modification of the shape of the support as winding progresses, and includes compaction devices to reduce wrinkling of the fabric obtained after compaction.