Gradient Composite Material for Shock Wave Mitigation
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Solution Overview
Problem
Current materials for mitigating the impact of shock waves, such as those from explosions, are inadequate in efficiently absorbing and redirecting compression waves, leading to insufficient protection against both primary and secondary blast effects.
Innovation Solution
A composite material with a gradient layer structure comprising microscale particles of varying sizes, arranged to form a particle size gradient, which absorbs, distorts, and redirects compression waves, and includes core-shell particles that can react to environmental stimuli to mitigate and remediate blast effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional materials (woven fabrics, ceramic materials, composite systems) are used for shock wave mitigation, then structural strength is provided, but the ability to absorb and redirect compression wave energy is insufficient
Solution Approach 1:
The composite material is divided into multiple layers with different particle size gradients. Each layer segment handles specific portions of the compression wave energy through progressive absorption and redirection, with larger particles in outer layers and smaller particles in inner layers creating a staged energy dissipation system that improves overall protection effectiveness
Solution Approach 2:
The invention uses a composite structure combining particles of varying sizes (microscale and nanoparticle formats) with different material properties arranged in gradient layers. This composite approach enables simultaneous energy absorption, distortion, and redirection capabilities that single materials cannot achieve, directly addressing the insufficient energy absorption and protection effectiveness
2Loss of energy
If uniform particle size is used in composite material, then manufacturing simplicity is maintained, but shock absorbing efficiency and hardness are reduced
Solution Approach 1:
Different particle size ranges are assigned to different layers of the composite material. Outer layers contain larger microscale particles for initial shock absorption, while inner layers contain smaller particles including nanoparticles for enhanced energy dissipation and hardness. This local differentiation optimizes shock absorbing efficiency without requiring uniform complexity throughout the entire structure
Solution Approach 2:
The particle size parameter is systematically varied across different layers of the composite material, creating a gradient structure that transitions from larger to smaller particles. This parameter change enables progressive energy absorption and improved hardness while maintaining a structured, manufacturable design rather than random complexity
3Adaptability or versatility
If passive material structure is used, then structural stability is maintained, but adaptability to different blast conditions and environmental stimuli is limited
Solution Approach 1:
The composite material incorporates core-shell particles with dynamic response capabilities. The shell material is designed to rupture or deform under specific stress thresholds, releasing core materials that provide secondary blast mitigation. This dynamic behavior allows the material to adapt its protective mechanisms based on the intensity and type of blast exposure while maintaining structural integrity under normal conditions
4Loss of energy
If single-layer particle structure is used, then manufacturing process is simplified, but ability to distort and redirect compression waves is insufficient
Solution Approach 1:
The invention transitions from a single-layer particle structure to a multi-layer gradient structure, adding the dimensional aspect of layering with varying particle sizes. This dimensional complexity enables the compression wave to be distorted and redirected through multiple interfaces and particle size transitions, creating a more effective energy dissipation pathway that justifies the increased structural complexity
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 composite material effectively reduces the destructive power of shock waves by absorbing and redirecting energy, while also providing secondary blast mitigation through reactive core-shell particles, offering enhanced protection and adaptability to environmental changes.
Implementation Method 1
a composite material with a structure that includes microscale particles that can interact with each other can absorb, distort, and/or redirect a compression wave, such as, e.g., a shock wave accompanying an explosion
Implementation Method 2
a composite material with a structure that includes microscale particles that can interact with each other can absorb, distort, and/or redirect a compression wave
Implementation Method 3
the composite material and/or at least one of the materials constituting the composite material can be further designed to mitigate and/or remediate primary and/or secondary effects resulting from the compression wave
Data Source
AI summary
Disclosed herein are engineered composite materials suitable for applications that can benefit from a composite material capable of interacting with or responding to, in a controlled or pre-determined manner, changes in its surrounding environment, such as to attenuate a compression wave. The composite material generally includes a plurality of repeating units, with each repeating unit including a first layer of particles having a first mean diameter, and a second layer of particles having a second mean diameter, and an intermediary material that allows mobility of and contact between the first particles within the first layer and mobility of and contact between the second particles within the second layer; the contact allowing momentum transfer between the particles. The first mean diameter and second mean diameter are different and are less than 500 nm. The first or second particles may be core-shell particles having a core that is partly or completely filled with a liquid, a gas and/or a gel, such as a fire suppressant, a medically active agent or a dye.