Bend Stiffener Reinforcement with Graduated Fiber Density
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Solution Overview
Problem
Existing bend stiffeners lack superior properties for resistance to bending and performance in harsh environmental conditions, particularly in maintaining mechanical integrity and longevity under stress and varying temperatures.
Innovation Solution
A bend stiffener comprising a braided sock of polymer fibers with a termination member and hoop armour, where the fibers are arranged in zones of decreasing density and spirally wound to provide graduated stiffness, embedded in an elastomer matrix, ensuring durability and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional reinforcement members (toroid ring, concentric sheets, cylindrical sleeve, loose grid) are used in bend stiffeners, then the structure provides basic bending resistance, but the mechanical integrity and longevity under harsh environmental conditions and stress are insufficient
Solution Approach 1:
The patent employs a composite reinforcement structure combining steel wires arranged in a hexagonal pattern with elastomer material. The steel wires provide tensile strength and structural integrity, while the elastomer matrix provides flexibility and environmental resistance. This composite approach creates a reinforcement member that maintains mechanical integrity under harsh conditions while providing the necessary flexibility for bend stiffening applications.
Solution Approach 2:
The reinforcement member features a hexagonal wire pattern with varying wire diameters and densities in different zones. The wire diameter increases from the center toward the outer regions, creating localized variations in stiffness and strength. This local quality variation allows the structure to provide enhanced resistance at critical stress points while maintaining flexibility in other areas, improving overall reliability under stress.
2Ease of manufacture
If uniform density reinforcement is used throughout the bend stiffener, then manufacturing is simplified, but the stiffness distribution is not optimized for gradual bending resistance
Solution Approach 1:
The reinforcement member incorporates a hexagonal wire pattern where wire diameter and density vary by location. The wires have smaller diameters near the center and larger diameters toward the outer regions, creating zones of different stiffness. This local quality variation provides graduated bending resistance that optimizes structural performance while the hexagonal pattern itself provides a manufacturable geometric framework.
Solution Approach 2:
The reinforcement structure is segmented into multiple hexagonal cells with varying wire characteristics. Each hexagonal zone can be considered a discrete unit with specific mechanical properties, allowing the overall structure to achieve graduated stiffness through repetition of modular segments with progressive variation in wire dimensions.
Data Source
AI summary
A bend stiffener, and a method of producing the same, comprising an elongated cylinder of a polymer material, having a termination interface (4) on at least one end. An internal reinforcement matrix is provided comprising a first layer of a cylindrically arranged woven material (2). The material of the first layer is unwoven at the termination end, the unwoven fibers engage the termination member (3) and pass back over the first layer. The returning fibers of the second layer may be cut at a plurality of lengths to provide zones (10, 11, 12) of decreasing fiber density from the termination end.


