Shear Thickening Fluid Stress Response Control
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Solution Overview
Problem
Current shear thickening fluids lack control over stress response characteristics, making it difficult to tailor their viscosity changes in response to varying levels of applied stress, which limits their application in specific situations.
Innovation Solution
The stress response of shear thickening fluids is controlled by manipulating the particle packing fraction, boundary stress through containment vessel materials, and particle size, as well as using engineered particles with specific stiffness and fracture properties to manage the onset and maximum viscosity levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If shear thickening fluid is used with standard particle suspension, then the fluid exhibits basic shear thickening behavior, but the stress response characteristics cannot be precisely controlled
Solution Approach 1:
The patent applies parameter changes by systematically varying particle properties including size (1-100 micrometers), density (1.5-3.0 g/cm³), and packing fraction (0.50-0.65) to precisely control the stress response characteristics of the shear thickening fluid, enabling customization of viscosity onset and maximum viscosity levels for specific applications
Solution Approach 2:
The patent employs composite materials by combining particles with different densities and sizes in specific ratios within the fluid matrix, creating a multi-component system where the interaction between particles of varying properties produces可控 stress response characteristics that cannot be achieved with single-component systems
2Strength
If particle packing fraction is increased to enhance viscosity control, then the maximum viscosity level increases, but the fluid becomes too thick under normal conditions
Solution Approach 1:
The patent applies local quality by creating regions of different particle concentrations and properties within the fluid, where specific particle size ranges and density values are localized to trigger viscosity changes at specific stress thresholds, allowing the fluid to remain thin under normal conditions while achieving high viscosity only when needed
Solution Approach 2:
The patent employs dynamics by designing a fluid system where particle packing fraction and viscosity are not fixed but dynamically adjust based on applied stress levels, enabling the fluid to transition from a low-viscosity state during normal operation to a high-viscosity state when stress thresholds are exceeded
3Manufacturing precision
If engineered particles with specific stiffness are used to control stress response, then the onset viscosity level is precisely controlled, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies parameter changes by precisely controlling particle stiffness (elastic modulus), size, and density parameters during manufacturing to achieve desired viscosity onset characteristics, using standardized production techniques that maintain ease of manufacture while achieving precise control over fluid behavior
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
This approach allows for precise control over the viscosity of shear thickening fluids, enabling them to be engineered for specific stress situations, enhancing their performance in applications like rotary dashpots and four-wheel drive systems by adjusting the onset and maximum viscosity levels.
Implementation Method 1
A shear thickening fluid, also known as a dilatant, is a non-Newtonian fluid that exhibits an increase in viscosity in response to an applied shear stress
Implementation Method 2
The particles 114, within the fluid matrix 112 of the shear thickening fluid 110, contact each other and form force chains 116
Implementation Method 3
The stress response of the contained dilatant can be controlled by the material properties of the containment vessel
Data Source
AI summary
A shear thickening fluid having a controlled stress response, in which various stress response characteristics, including, an onset stress, a boundary stress and a fractures stress, can be controlled. The stress response characteristics controlled by the controlled properties of the shear thickening fluid, including the viscosity of a fluid medium, the mechanical properties of the suspended particles and the mechanical properties of the fluid boundary.