Pressurized Core-Shell Particles for Nonlinear Bulk Modulus
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Solution Overview
Problem
Current materials lack a substance with a nonlinear bulk modulus that decreases under compressive load, which is desirable for applications such as springs and gaskets to provide a smooth ride and resistance to mechanical failure.
Innovation Solution
A particle with a shell and core is developed, where the shell has a circumferentially varying thickness and the core is pressurized, resulting in a nonlinear bulk modulus that decreases with increasing pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a stiff binder material is used to provide high strength and compressive resistance, then the material strength is improved, but the material becomes too rigid and cannot provide the desired nonlinear bulk modulus behavior
Solution Approach 1:
The invention combines a stiff binder material with soft additive particles to create a composite material that exhibits nonlinear bulk modulus behavior. The binder provides structural integrity and compressive strength, while the soft additive particles enable the bulk modulus to decrease under compressive load through their ability to compress and rearrange.
Solution Approach 2:
The soft additive particles are distributed throughout the stiff binder matrix, creating local regions of compliance. These localized soft regions allow the material to exhibit nonlinear bulk modulus behavior at the macro scale while maintaining the overall strength provided by the binder.
2Adaptability or versatility
If elastomers are used to achieve nonlinear bulk modulus behavior, then the material becomes softer under strain, but no known materials become softer when strained over a broad range of operating conditions
Solution Approach 1:
The composite combines materials with complementary properties: the stiff binder provides strength under load while the soft additive particles provide the nonlinear bulk modulus behavior. Together, they achieve both strength and adaptability that neither material could provide alone.
3Strength
If soft additive particles are sparsely distributed in a stiff binder, then the binder provides structural integrity, but the aggregate elastic behavior is governed by the softest layer and the soft additive has no effect
Solution Approach 1:
The invention changes the volume fraction parameter of the soft additive from sparse to large (hybrid case). When the soft additive constitutes a large volume fraction, the composite exhibits net behavior with properties between the stiff binder and soft additive, enabling the nonlinear bulk modulus effect to manifest while maintaining structural integrity.
4Strength
If a gasket material is made from stiff material, then it provides high strength, but it experiences stress concentrations at surface imperfections leading to mechanical failure
Solution Approach 1:
The composite gasket material combines stiff binder for strength with soft additive particles that can deform and accommodate surface imperfections. This reduces stress concentrations and prevents crack initiation, improving reliability while maintaining strength.
Solution Approach 2:
The soft additive particles are distributed throughout the stiff binder, creating local regions that can deform to accommodate surface imperfections and stress concentrations, preventing crack initiation and propagation.
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 material exhibits a nonlinear bulk modulus that decreases under compressive load, providing enhanced deformation characteristics and resistance to mechanical failure, making it suitable for composite materials and various applications.
Implementation Method 1
The core is pressurized and manufactured from a material having a bulk modulus less than the bulk modulus of the shell material
Implementation Method 2
A particle with a shell and core is developed, where the shell has a circumferentially varying thickness
Data Source
AI summary
Particles are provided which have a bulk modulus that varies nonlinearly with changes in pressure. The shell having a shell and a core is manufactured from a solid elastic material as a tube shape with a closure at both ends. The core is manufactured from a material having a bulk modulus less than the bulk modulus of the shell material and is pressurized. A system for fabricating the particles operationally includes a first pair of crimping wheels, a second pair of crimping wheels, and a pair of cutting wheels. During manufacture, feed stock is fed along a central line of symmetry; first passing between the first pair of crimping wheels, between the second pair of crimping wheels, and then between the cutting wheels. Particles are created by crimping, sealing and cutting sections of the feed stock to form individual or strings of particles.