Negative Poisson's Ratio Foam for Sporting Goods
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Solution Overview
Problem
Conventional sporting goods, such as golf balls and clubs, face challenges in achieving optimal energy transfer and durability due to limitations in material properties, particularly in efficiently managing impact resistance and aerodynamic performance.
Innovation Solution
The use of negative Poisson's ratio (NPR) materials in the cores and structures of sporting goods, combined with positive Poisson's ratio (PPR) materials, facilitates efficient energy transfer, impact resistance, and aerodynamic properties by incorporating NPR foams, polymers, and composite materials, allowing for enhanced durability and longer launching distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional materials are used in sporting goods, then manufacturing is simpler and cost is lower, but energy transfer efficiency and durability are insufficient
Solution Approach 1:
The patent utilizes composite materials combining positive Poisson's ratio (PPR) and negative Poisson's ratio (NPR) materials to achieve superior energy transfer efficiency. The NPR material component provides enhanced elastic recovery and energy return characteristics, while the PPR material provides structural stability. This composite approach resolves the contradiction by delivering high energy transfer efficiency while managing the complexity through targeted material selection rather than universal complexity.
Solution Approach 2:
The patent changes the Poisson's ratio parameter of the core material from conventional positive values to include negative Poisson's ratio materials. This parameter change fundamentally alters the material's deformation behavior under stress, enabling enhanced energy transfer efficiency during impact events such as golf club strikes. The parameter change directly addresses the energy transfer requirement while the controlled implementation manages the associated complexity.
2Strength
If harder materials are used to improve impact resistance, then durability increases, but energy absorption and shock mitigation decrease
Solution Approach 1:
The patent employs negative Poisson's ratio materials which exhibit unique deformation characteristics where the material expands laterally when stretched and contracts laterally when compressed. This parameter change in Poisson's ratio enables the material to simultaneously provide high impact resistance through enhanced structural integrity and improved energy absorption through controlled deformation mechanisms, resolving the traditional trade-off between these properties.
Solution Approach 2:
The patent incorporates porous or cellular structured NPR materials that provide both strength and energy absorption capabilities. The porous structure allows for progressive collapse and deformation under impact, absorbing energy while maintaining overall structural integrity and impact resistance. This approach enables simultaneous achievement of durability and energy absorption that would be contradictory in solid non-porous materials.
3Stability of the object's composition
If more rigid structures are used to maintain shape stability, then structural integrity improves, but aerodynamic performance and flexibility decrease
Solution Approach 1:
The patent utilizes negative Poisson's ratio materials that provide enhanced shape stability through their unique deformation characteristics while maintaining flexibility. The NPR materials can deform elastically during impact and then recover their original shape, providing both stability and flexibility. This resolves the contradiction by enabling the structure to maintain integrity without excessive rigidity that would harm aerodynamic performance.
Solution Approach 2:
The patent incorporates dynamic material properties where the NPR materials can adapt their stiffness and deformation characteristics based on the applied load and environmental conditions. This dynamic behavior allows the structure to maintain shape stability during normal use while providing flexibility and reducing aerodynamic drag during flight or movement, resolving the static contradiction between rigidity and flexibility.
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 integration of NPR and PPR materials in sporting goods enables improved energy absorption, reduced deformation upon impact, and enhanced aerodynamics, resulting in longer launching distances and better control over the flight path of the ball.
Implementation Method 1
a core including a negative Poisson's ratio (NPR) foam material, in which the core has a Poisson's ratio of between 0 and −1
Implementation Method 2
the NPR foam material includes an NPR polymer foam
Implementation Method 3
This composition facilitates efficient energy transfer from a golf club to the golf ball
Data Source
AI summary
In an aspect, a sports ball includes a core including a negative Poisson's ratio (NPR) foam material, in which the core has a Poisson's ratio of between 0 and −1, and in which the NPR foam material includes an NPR polymer foam; and a cover layer surrounding the core. In an aspect, a golf club includes an elongated shaft; a grip disposed at a first end of the elongated shaft; and a head connected to a second end of the elongated shaft, the head having a flat face configured for contact with a golf ball, in which the flat face is formed of a negative Poisson's ratio (NPR) foam material, in which the head has a Poisson's ratio of between 0 and −1, and in which the NPR foam material includes an NPR metal foam, an NPR ceramic foam, or an NPR-PPR composite foam.