Composite Limb Fiber Orientation for Strength
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Solution Overview
Problem
There is a need for composite flexural members that are strong, lightweight, and exhibit longevity, as existing composite materials do not adequately meet these requirements.
Innovation Solution
The solution involves a composite structure with two layers of reinforcing fibers oriented at a non-zero angle, where the second layer's fibers have greater tensile strength and extend the full length, and the first layer's fibers are unidirectional and oriented parallel to a surface, with a cover layer applied to create a tension and compression surface configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single layer of reinforcing fibers is used, then the structure is simple and easy to manufacture, but the mechanical strength and stiffness are insufficient
Solution Approach 1:
The composite flexural member is divided into multiple layers (first layer and second layer) with different fiber orientations. The first layer has fibers oriented at a first angle relative to the longitudinal axis, while the second layer has fibers oriented at a second angle relative to the longitudinal axis. This segmentation allows each layer to contribute differently to the overall mechanical properties, with the first layer providing baseline strength and the second layer enhancing stiffness and strength in specific directions.
Solution Approach 2:
The invention uses composite materials consisting of multiple layers with different fiber orientations and potentially different material compositions. The first composite material has first reinforcing fibers at a first angle, while the second composite material has second reinforcing fibers at a second angle. This composite structure leverages the synergistic effects of different materials and orientations to achieve superior mechanical properties that cannot be obtained from a single layer.
2Strength
If fibers are oriented in multiple directions to increase strength, then the mechanical strength and stiffness improve, but the manufacturing precision and alignment difficulty increase
Solution Approach 1:
Different regions of the composite flexural member have different fiber orientations optimized for their specific functional requirements. The first layer has fibers oriented at a first angle that provides baseline strength, while the second layer has fibers oriented at a second angle that enhances stiffness and strength in specific directions. This local optimization allows each region to be manufactured with appropriate precision for its specific role, rather than requiring uniform high precision throughout.
Solution Approach 2:
The invention changes the orientation parameter of the reinforcing fibers between different layers. The first layer has fibers at a first angle relative to the longitudinal axis, while the second layer has fibers at a second angle. This parameter change allows the structure to achieve enhanced mechanical properties through controlled variation in fiber orientation, which can be managed in the manufacturing process through standardized procedures for creating different angular configurations.
3Strength
If longer fibers are used to improve strength, then the mechanical strength increases, but the manufacturing complexity and material handling difficulty increase
Solution Approach 1:
The reinforcing fibers are segmented into different lengths and orientations across multiple layers. The first layer contains first reinforcing fibers with a first length and orientation, while the second layer contains second reinforcing fibers with a second length and orientation. This segmentation allows optimization of fiber length for each layer's specific function, with longer fibers in the second layer providing enhanced strength where needed, while shorter fibers in the first layer simplify manufacturing and handling.
Data Source
AI summary
In some embodiments, an archery bow limb comprises a body comprising a tension surface, a compression surface, a first layer and a second layer. The first layer comprises the compression surface and comprises first reinforcing fibers. The second layer comprises the tension surface and comprises second reinforcing fibers. The first reinforcing fibers are oriented at a non-zero angle to the second reinforcing fibers.