Composite Multi-Branch Fitting with Curved Blade Joints
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Solution Overview
Problem
Multi-branch fittings made of composite materials face challenges in distributing tensile and compression forces effectively, leading to weakness in resin matrices and reduced strength, especially during folding and unfolding operations, as existing techniques fail to optimally orient reinforcing fibers without high costs.
Innovation Solution
A multi-branch fitting with a polygonal cross-section and curved blade connections, along with domed or hollow portions, is designed to distribute forces efficiently, using a method that involves assembling and folding fiber-reinforced layers in a mold under specific pressure and temperature conditions to create a T-shaped profile with optimized fiber orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If composite materials are used to replace metal fittings, then weight is reduced, but strength and specific strength are decreased
Solution Approach 1:
The patent applies local quality by varying the fiber orientation angles in different regions of the fitting. Specifically, the first set of fibers is oriented at a first angle relative to the neutral axis in the first region, while the second set of fibers is oriented at a second angle in the second region. This allows each region to have optimized fiber alignment for its specific stress state, maximizing the composite material's strength-to-weight ratio throughout the structure.
Solution Approach 2:
The patent uses composite materials consisting of fiber-reinforced polymer matrices with multiple fiber sets oriented at different angles. This composite structure allows the material to simultaneously achieve low weight and high strength by distributing fibers strategically to handle different stress components (tensile, compressive, shear) in various directions, thereby resolving the contradiction between weight reduction and strength maintenance.
2Ease of manufacture
If conventional molding techniques are used, then manufacturing is simple, but fiber orientation cannot be optimized for tensile and compression forces
Solution Approach 1:
The patent segments the fiber reinforcement into multiple distinct sets, each oriented at different angles relative to the neutral axis. The first set of fibers is oriented at a first angle in the first region, while the second set is oriented at a second angle in the second region. This segmentation allows each fiber set to be optimized for specific force directions (tensile, compressive, shear) while maintaining a single molded part structure, thus achieving fiber optimization without sacrificing manufacturing simplicity.
3Ease of manufacture
If the resin matrix is stressed during folding operations, then the fitting can be manufactured, but the resin breaks and strength is lost
Solution Approach 1:
The patent changes the structural parameters by introducing multiple fiber sets with different orientation angles and creating distinct regions with different fiber configurations. This parameter change allows the structure to bear loads through fiber tension/compression rather than relying on the resin matrix, thereby maintaining resin integrity during folding operations while ensuring manufacturability and structural reliability.
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 solution enhances the strength and rigidity of the multi-branch fitting during folding and unfolding by ensuring that reinforcing fibers bear the majority of the forces, while maintaining a constant thickness and avoiding weight increase, thus addressing the weaknesses of composite materials in existing designs.
Implementation Method 1
a multi-branch fitting made of composite material, and more specifically from a fiber-reinforced thermoplastic or thermosetting matrix
Implementation Method 2
the reinforcing fibers are subjected to the tensile and/or compression forces, and that the resin is not or little stressed
Data Source
AI summary
A multi-branch fitting includes at least three branches, molded from a composite material and, more precisely, from a fiber-reinforced thermoplastic or thermoset matrix. The fitting is intended for assembling components which are at an angle to one another. There are at least three flat or substantially flat branches or flanges extending radially from a joining zone, and at least one face or part of a face constituting a bearing face for one or more of the components that are to be attached. The joining zone has a cross section, in the transverse direction, in the shape of a polygon with concave sides. The connection of each of the branches or flanges with another adjacent branch or flange is achieved through a portion in the shape of a curved blade which gives the joining zone one of its concave shapes.