Variable Web Height Textile Preform Deformation
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Solution Overview
Problem
Current methods for producing fiber composite components in aircraft construction, such as resin transfer moulding, are limited by the inflexibility of prepreg materials, which are costly and have limited storage life, and cannot produce components with variable profiles, making it difficult to create components like fuselage floor structures with varying heights.
Innovation Solution
A method and device for producing a textile preform with a variable profile by deforming individual fiber layers of a multi-layer fiber fabric to set a web height in a flexible manner, allowing for the deposition of unidirectional fiber fabric on deformed layers, enabling the creation of preforms with adjustable heights and angles, which can be used to produce components with complex geometries like Z-shaped or U-shaped structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If continuously introduced fiber layers are deformed transversely and longitudinally curved to produce preforms, then preforms can be manufactured with defined profiles, but the system can only produce preforms of the same profile over the entire length and layers with 0° fiber orientation cannot be deformed
Solution Approach 1:
The fiber fabric is divided into multiple individual layers that can be deformed independently. The guiding device processes each layer separately, allowing different deformation patterns for different layers while maintaining precise control over each layer's final profile
Solution Approach 2:
The guiding device is made adjustable and movable during the deformation process. It can be positioned at different locations and configured to create varying profile heights along the length of the preform, enabling dynamic adaptation to different geometric requirements
2Adaptability or versatility
If the entire fiber fabric is deformed from the start to create variable web height, then complex geometries can be achieved, but the process becomes overly complex and difficult to control
Solution Approach 1:
Instead of deforming the entire fiber fabric simultaneously, the process segments the deformation into individual layer operations. Each layer is deformed separately through the guiding device, which simplifies the control mechanism while still achieving complex final geometries through the cumulative effect of multiple deformed layers
Solution Approach 2:
The fiber layers are deformed and positioned in a predetermined sequence before final assembly. The guiding device prepares each layer with the required profile in advance, making the overall process more manageable and controllable
Data Source
AI summary
A method for producing a textile preform includes manufacturing a multi-layer fiber fabric, which includes a first flange portion and a web portion connected to the first flange portion, deforming a first fiber layer of the first flange portion with respect to the web portion, such that the first fiber layer is at a first flange portion angle to the web portion, a web height of the web portion being set in a variable manner during the deformation of the first fiber layer, and depositing a unidirectional fiber fabric only on the deformed first fiber layer of the first flange portion.