Composite Part Reinforcement with Single Crossing Line
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Solution Overview
Problem
Current fiber placement methods for manufacturing composite parts, such as helicopter blades, result in surface aspects with low damage resistance due to unidirectional layers, where damage propagation is rapid along the fibers, and existing patterns do not adequately address the varied impacts these parts may face.
Innovation Solution
A method involving the controlled deposition of pre-impregnated or dry reinforcing fibers in crossed layers with specific patterns to create intersections that act as barriers to damage propagation, optimizing damage tolerance by determining the directions, pitch, and number of ribbons to limit stiffness reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If unidirectional layers are used in fiber placement, then the manufacturing process is simple, but damage propagation is rapid and damage resistance is low
Solution Approach 1:
The patent divides the reinforcement structure into multiple layers with different fiber orientations (0°, +45°, -45°, 90°) rather than using a single unidirectional layer. This segmentation creates multiple barriers to crack propagation while maintaining manufacturing feasibility through systematic layering processes.
Solution Approach 2:
The patent employs composite material construction by combining multiple layers of fibers with different orientations and properties. This creates a multi-directional reinforcement structure that resists damage propagation better than unidirectional layers while remaining manufacturable through standardized composite material techniques.
2Reliability
If multiple crossed layers are deposited to improve damage tolerance, then impact resistance improves, but stiffness reduction increases
Solution Approach 1:
The patent applies different fiber orientations and layer configurations to different regions of the composite part based on local stress patterns. High-stress areas receive enhanced multi-directional reinforcement, while lower-stress areas use simpler layering, optimizing both impact resistance and stiffness preservation locally throughout the structure.
Solution Approach 2:
The patent systematically varies parameters such as fiber orientation angles, layer thicknesses, and spacing to optimize the balance between damage tolerance and stiffness. By adjusting these parameters during the deposition process, the patent achieves high impact resistance while minimizing stiffness reduction.
3Reliability
If complex patterns with multiple crossing lines are created, then damage propagation is limited, but manufacturing complexity increases
Solution Approach 1:
The patent uses periodic, systematic deposition patterns where fibers are laid down in repeated cycles of different orientations (0°, +45°, -45°, 90°). This periodic action creates complex crossing patterns that effectively limit damage propagation while maintaining a regular, predictable manufacturing process that is not overly complex.
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 method enhances the mechanical behavior of composite parts by creating patterns that limit crack propagation and improve impact resistance without significantly reducing stiffness, making them suitable for high-torsion applications like helicopter blades.
Implementation Method 1
This placement device therefore ensures the positioning of the fibers on the surface by direct mechanical contact without the need for any particular tension at the level of the fibers
Implementation Method 2
The reinforcing material is thus deposited continuously and is positioned and applied solely by the effect of a controlled tension between the point of deposition on the surface and the point of exit from the reinforcement material coil support system
Implementation Method 3
The helical-type movement is ensured by a combination of at least one rotational movement and one translational movement, typically along an axis parallel to the axis of rotation
Implementation Method 4
The reinforcement material is thus deposited continuously... The reinforcing material is therefore not positioned by application to the surface via a roller or equivalent element
Data Source
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AI summary
The present invention relates to the manufacture of a reinforcing coating for a composite part. Pre-impregnated reinforcing fibers, in the form of tapes, are used and are deposited onto the part by placement, with two longitudinal layers of tapes. This manufacturing process involves using an angular orientation of the tapes in each layer, respectively 0° and any other angle relative to a determined direction of the solid body to be covered, with an interlacing pattern that creates intersecting lines of layers parallel to a longitudinal axis of the solid body to be covered. This pattern is chosen to form interlacing lines that limit the number of intersecting lines along the longitudinal axis of the solid body to a single interlacing line.