Composite Casing Fiber Texture for Shear Resistance
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Solution Overview
Problem
Current composite material fan casings for aeronautical engines face challenges in mechanical resistance, particularly during blade loss events, where they need to absorb and manage high-energy impacts while maintaining structural integrity and minimizing mass.
Innovation Solution
A fibrous texture with a three-dimensional weave pattern, featuring alternating layers of glass and carbon fiber yarns strategically placed to enhance shear resistance and deformation capacity, is used to reinforce the casing. The internal layers consist of glass fibers for increased shearing resistance and carbon fibers for rigidity, while external layers utilize glass fibers for high deformation rates and carbon fibers for maintaining rigidity, ensuring optimal stress management during impact events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass fiber yarns are used in the internal layers to increase shear resistance, then the casing's resistance to blade impact improves, but the mass of the casing increases
Solution Approach 1:
The patent applies different fiber materials (glass vs carbon) to different layers of the fibrous texture based on their specific functional requirements. Glass fiber yarns are placed in internal layers where shear resistance is critical, while carbon fiber yarns are used in external layers where rigidity and deformation control are prioritized. This localized material differentiation optimizes performance while minimizing overall mass.
Solution Approach 2:
The invention uses a composite structure combining glass fiber yarns and carbon fiber yarns in a three-dimensional woven fibrous texture. This composite approach leverages the complementary properties of both materials: glass fibers provide superior shear resistance for impact management, while carbon fibers contribute rigidity and controlled deformation characteristics, achieving enhanced overall performance without excessive weight gain.
2Stability of the object's composition
If carbon fiber yarns are used to maintain rigidity, then the casing's structural stability improves, but the deformation capacity during impact decreases
Solution Approach 1:
The patent strategically positions carbon fiber yarns in external layers where rigidity and structural stability are most needed, while placing glass fiber yarns in internal layers where deformation capacity and energy absorption are critical. This spatial differentiation allows each material to excel in its optimal functional zone.
Solution Approach 2:
The three-dimensional woven structure integrating carbon fiber and glass fiber yarns creates a composite system where carbon fibers provide the necessary rigidity and structural integrity, while glass fibers contribute superior deformation capacity and energy absorption during impact events, achieving a balance between stability and flexibility.
3Strength
If a three-dimensional weave with multiple fiber layers is used to improve impact resistance, then the mechanical properties enhance, but the manufacturing complexity increases
Solution Approach 1:
The fibrous texture is segmented into distinct layers with specific fiber compositions: internal layers contain glass fiber yarns for shear resistance, while external layers contain carbon fiber yarns for rigidity. This segmentation allows each layer to be optimized for its specific function while maintaining overall structural integrity.
Solution Approach 2:
The patent employs a three-dimensional weaving structure that adds a vertical dimension to the traditional planar fabric. Multiple layers of warp and weft yarns are interlaced in the thickness direction, creating a volumetric structure that provides superior impact resistance and shear strength compared to conventional two-dimensional fabrics.
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 configuration improves the casing's resistance to projectile impacts by limiting penetration depth and effectively managing energy absorption and restitution, thereby enhancing the overall mechanical properties and reducing the risk of damage during blade loss events.
Implementation Method 1
The yarns or strands made of glass fibers have a resistance to shearing and to elongation which is much greater than that exhibited by the yarns or strands made of carbon fibers
Implementation Method 2
the other layers of warp yarns or strands comprising carbon fiber yarns or strands
Implementation Method 3
During this phase, energy is stored by the casing in the form of deformation
Implementation Method 4
the energy stored by the projectile is fully absorbed by the deformation of the casing
Implementation Method 5
During phase 4, the energy is restored by deformation of the casing to return to the initial geometry
Data Source
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AI summary
A fiber texture (100) in the form of a web comprises a first portion (P1) extending in a longitudinal direction (X) between a proximal section (110) and an intermediate section (PI). One or more layers of warp threads or strands on an inner face (Fl) of the fiber texture (100) at least partially comprise glass fiber threads or strands, while the threads or strands of the other layers of warp threads or strands comprise carbon fiber threads or strands. The fiber texture (100) further comprises a second portion (P2) extending in the longitudinal direction between the intermediate section (PI) and a distal section (120) of the fiber texture. One or more of the plurality of layers of warp threads or strands on an outer face (F2) of the fiber texture (100) at least partially comprise glass fiber threads or strands, while the threads or strands of the other layers of the plurality of layers of warp threads or strands comprise carbon fiber threads or strands. The warp threads or strands are continuous over the entire length (Lioo) of the fiber texture (100).