3D Braided Shaft Structure for Delamination-Resistant Composites
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Solution Overview
Problem
Sporting implements made from composite materials often lack strength and stiffness in the perpendicular direction, are prone to delamination, and fail due to inter-laminar weakness.
Innovation Solution
A 3D braided structure with varying fiber orientations and geometries is used to enhance resistance to delamination, incorporating fibers oriented in three dimensions (X, Y, and Z) with crimps or loops to maintain layer integrity and provide strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If composite structures are formed by stacking layers of different orientations, then the desired thickness and shape are achieved, but the strength and stiffness in the perpendicular direction are insufficient
Solution Approach 1:
The patent transitions from traditional 2D layer stacking to 3D braided composite structures. The 3D braiding process interlaces fibers in three dimensions (x, y, and z directions), creating a volumetric network that provides continuous reinforcement through the thickness direction. This dimensional transformation eliminates the weak perpendicular direction inherent in laminated structures while maintaining structural integrity without requiring complex multi-layer stacking sequences.
Solution Approach 2:
The invention employs 3D braided composite materials that integrate multiple fiber orientations within a single continuous structure. Unlike conventional laminates that rely on matrix bonding between discrete layers, the 3D braided structure creates an interlocked fiber network where fibers from different directions are mechanically intertwined, providing enhanced strength and stiffness in all three principal directions simultaneously.
2Reliability
If layers are connected through matrix only, then the structure is formed, but delamination occurs easily
Solution Approach 1:
The 3D braided architecture introduces through-thickness fiber reinforcement that physically interlocks adjacent layers. Z-direction fibers traverse the thickness and mechanically bind the structure, preventing delamination by creating a three-dimensional load path that distributes stresses across multiple layers rather than relying solely on matrix bonding at layer interfaces.
Solution Approach 2:
The invention merges the functions of multiple layers into a single integrated 3D braided structure. Instead of separate layers connected by matrix, the braiding process creates a unified volumetric network where fibers from different orientations are interlaced and bonded together, forming an inseparable composite structure that resists delamination forces.
3Reliability
If 3D braided structure is implemented, then resistance to delamination increases, but manufacturing complexity increases
Solution Approach 1:
The 3D braided preform is manufactured and configured with the desired complex geometry and fiber orientation distribution before the composite fabrication process. This preliminary structuring allows the challenging 3D architecture to be established once during preform production, after which the actual composite manufacturing involves simpler steps such as resin infusion or consolidation, thereby reducing the complexity of the primary manufacturing process.
Solution Approach 2:
The manufacturing process is divided into distinct stages: preform fabrication (creating the 3D braided structure) and composite consolidation (impregnating with matrix material). This segmentation allows each stage to be optimized independently - the preform can be manufactured using specialized braiding machinery, while the consolidation phase uses conventional composite processing techniques, making the overall process more manageable and scalable.
Data Source
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AI summary
A sporting implement comprising: a shaft having a first end and a second end, a 3D braided material shaped to a dimension of the shaft wherein the 3D braided material extends substantially from the first end to the second end of the shaft, the 3D braided material comprising a first plurality of plurality of tapes (902) extending in the X direction only, a plurality of braiding tapes (904, 906) extending in the X, Y and Z directions, wherein the 3D braided material has a substantially consistent thickness from the first end to the second end of the shaft.