Racket Frame Aramid Layer Shock Resistance
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Solution Overview
Problem
Racket frames in racket sports played on grounds with walls suffer from insufficient shock resistance and friction, leading to damage and weight issues due to the use of composite materials and bumper strips, which are heavy, prone to breakage, and aesthetically undesirable.
Innovation Solution
Incorporating a layer of aramid fibers for improved ductility and a fluoropolymer sliding layer on the racket frame, particularly in the upper part, to enhance shock resistance and reduce friction, eliminating the need for a bumper while maintaining structural integrity and reducing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bumper strip is added to protect the racket frame from impact and abrasion, then the resistance to shocks and friction is improved, but the weight of the racket increases
Solution Approach 1:
The patent combines the protective function and the structural function into a single integrated layer. The aramid layer serves both as a structural component of the racket frame and as a protective element against impacts and abrasion, eliminating the need for a separate bumper strip. This merging resolves the contradiction by providing protection without adding extra weight.
Solution Approach 2:
The patent uses aramid, a high-performance composite material, to create a layer that provides both structural integrity and impact resistance. Aramid fibers have exceptional strength-to-weight ratio and toughness, allowing the frame to resist shocks and friction while maintaining lightweight construction. This composite material approach resolves the contradiction between protection and weight.
2Stability of the object's composition
If high-modulus composites are used to achieve sufficient rigidity, then the stiffness-to-mass ratio is improved, but the impact resistance decreases due to lack of ductility
Solution Approach 1:
The patent changes the material parameter from high-modulus composites (which are rigid but brittle) to aramid (which has lower modulus but higher ductility and toughness). This parameter change allows the frame to deform elastically under impact loads and return to its original shape, providing impact resistance while maintaining sufficient rigidity for structural stability.
Solution Approach 2:
The patent applies the aramid layer specifically to the upper part of the racket head, which is the region most susceptible to impacts and abrasion during play. This localized application provides enhanced impact resistance where needed most, while the rest of the frame can use different materials optimized for other functions, resolving the contradiction between rigidity and impact resistance.
3Reliability
If a bumper strip is added to protect the racket frame, then the resistance to abrasion is improved, but the aesthetic appearance deteriorates
Solution Approach 1:
The protective aramid layer is integrated into the frame structure itself rather than being added as a separate bumper strip. This merging allows the protective element to become part of the frame's aesthetic design, eliminating the visual disruption caused by traditional bumpers while maintaining abrasion resistance.
4Reliability
If a plastic bumper is fitted on the composite frame, then the protection from impact is improved, but vibrations are introduced due to imperfect fit
Solution Approach 1:
By integrating the aramid layer directly into the frame structure during manufacturing, the patent eliminates the interface between separate components that causes vibrations. The aramid layer becomes an integral part of the frame, ensuring perfect fit and eliminating the vibration problem associated with fitted bumpers while maintaining impact protection.
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 provides a lightweight, impact-resistant racket frame with improved vibration damping and sliding performance, reducing the risk of damage and enhancing maneuverability without the aesthetic drawbacks of traditional bumper systems.
Implementation Method 1
at least the upper part of said head comprises at least one ductility-enhancing layer, comprising aramid
Implementation Method 2
improving resistance to abrasion due to impacts and friction against a wall
Implementation Method 3
a sliding layer, improving resistance to abrasion due to impacts and friction against a wall, comprising a fluoropolymer
Data Source
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AI summary
The invention relates to a racket frame, comprising a handle and a racket head, made at least partially of a composite material, the upper part of said head comprising at least one ductility-enhancing layer, comprising aramid, covered with a slip-resistant layer, improving abrasion resistance, comprising a fluoropolymer. The invention also relates to a racket comprising such a frame. The invention further relates to a method for manufacturing such a racket frame or such a racket.