Negative poisson's ratio materials for cookware
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Solution Overview
Problem
Existing cookware materials with positive Poisson's ratio (PPR) lack efficiency in energy absorption, tensile strength, flexibility, impact resistance, and durability, as well as effective thermal energy transfer and management.
Innovation Solution
The use of cookware materials with negative Poisson's ratio (NPR) that are integrated into a layered composite structure, including a base with alternating layers of PPR and NPR materials, or as a matrix composite with NPR inclusions in a PPR matrix, to enhance mechanical and thermal properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If PPR materials are used in cookware, then the structure is simple and easy to manufacture, but the energy absorption, tensile strength, flexibility, and impact resistance are insufficient
Solution Approach 1:
The patent applies composite materials by combining PPR and NPR materials in layered or matrix configurations. The base includes a first layer of PPR material and a second layer of NPR material disposed in contact with the first layer, creating a composite structure that achieves superior tensile strength and impact resistance while managing complexity through structured material integration.
Solution Approach 2:
The patent segments the cookware base into multiple distinct layers with different material properties. The base is divided into a first layer (PPR material) and a second layer (NPR material), allowing each layer to contribute specific mechanical properties. This segmentation enables the overall structure to achieve enhanced strength and flexibility that neither material could provide alone.
2Use of energy by moving object
If PPR materials are used in cookware, then the density is higher providing structural integrity, but the thermal energy absorption and transfer efficiency is reduced
Solution Approach 1:
The patent uses composite materials combining PPR and NPR materials to achieve optimal thermal performance. The NPR material layer provides superior thermal energy absorption and transfer efficiency, while the PPR material maintains structural integrity. This composite approach allows the cookware to be lighter and more thermally efficient than conventional PPR-only cookware.
Solution Approach 2:
The patent applies local quality by assigning different material properties to different regions of the cookware base. The NPR material is specifically positioned in the second layer where thermal energy absorption and transfer are critical, while the PPR material in the first layer provides structural support. This localized material assignment optimizes thermal performance without compromising overall structural integrity.
3Reliability
If PPR materials are used in cookware, then the thermal expansion coefficient is higher, but the thermal shock resistance is reduced
Solution Approach 1:
The patent employs composite materials with PPR and NPR layers to achieve balanced thermal properties. The NPR material's lower thermal expansion coefficient compensates for the PPR material's higher expansion, resulting in a composite structure with reduced overall thermal expansion and enhanced thermal shock resistance. This composite approach improves reliability under thermal stress.
Solution Approach 2:
The patent changes the thermal parameters of the cookware base by incorporating NPR material with a lower thermal expansion coefficient. This parameter change in the material composition results in reduced thermal expansion and shrinkage behavior, enhancing the cookware's ability to withstand thermal shock and improving overall durability and reliability.
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
NPR cookware exhibits improved tensile strength, flexibility, impact resistance, and durability, while also being lighter and more efficient in thermal energy absorption, retention, and transfer, with reduced thermal shrinkage or expansion compared to PPR cookware.
Implementation Method 1
an item of cookware including NPR material can absorb, retain, and transfer thermal energy from a heating apparatus or source more effectively than otherwise a comparable item of PPR cookware
Implementation Method 2
NPR materials can have lower coefficients of thermal expansion than comparable PPR materials, and thus an item of NPR cookware can undergo less thermal shrinkage or expansion than a comparable item of PPR cookware
Data Source
AI summary
A cooking vessel includes a base having a flat bottom and a sidewall connected to and surrounding the base, thereby defining an interior space configured for containing food. The base comprises a layered composite material that includes a first layer of the composite material has a positive Poisson's ratio (PPR) and a second layer of the composite material is disposed in contact with the first layer. The cooking vessel includes a material having a negative Poisson's ratio (NPR).