Multilayer Engineered Aggregates for Metamaterials
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Solution Overview
Problem
Conventional composite materials lack the ability to dynamically respond to specific frequency ranges of dynamic forces such as seismic waves and blast waves, leading to inadequate energy absorption and increased stress on the material, which can result in damage.
Innovation Solution
Engineered aggregates with a multilayer structure, comprising a high-density core surrounded by a compliant layer, are integrated into a matrix material to create metamaterials that exhibit negative effective mass, allowing for resonant behavior and energy trapping within specific frequency ranges, thereby reducing stress and enhancing dynamic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional composite materials are used, then the material structure is simple and easy to manufacture, but the material cannot dynamically respond to specific frequency ranges of dynamic forces, leading to inadequate energy absorption
Solution Approach 1:
The aggregate is segmented into multiple functional layers: a high-density core material surrounded by a compliant material layer. This segmentation allows each layer to perform a specific function - the core provides mass for inertial effects while the compliant layer enables deformation and energy dissipation, together achieving frequency-specific energy absorption that conventional homogeneous materials cannot provide
Solution Approach 2:
The invention uses composite materials by combining core material and compliant material in a multilayer aggregate structure. This composite approach enables the material to exhibit dynamic response characteristics at specific frequency ranges, allowing it to absorb energy from seismic waves and blast waves while maintaining structural integrity, something that single-material composites cannot achieve
2Reliability
If conventional composite materials are used, then the manufacturing process is simple, but the material experiences increased stress under dynamic forces, resulting in damage
Solution Approach 1:
The compliant material layer acts as a pre-designed cushioning element that activates when dynamic forces are applied. This layer is engineered to deform and dissipate energy from seismic waves and blast waves before the stress can propagate through the entire structure and cause damage, providing beforehand protection against dynamic loading
Solution Approach 2:
The aggregate design changes the stress distribution parameters by using materials with different mechanical properties - the high-density core maintains structural integrity while the compliant layer reduces peak stresses through deformation. This parameter-based approach allows the material to withstand dynamic forces that would damage conventional composites
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 metamaterials effectively absorb and dissipate mechanical energy, reducing stress and enhancing the ability to withstand dynamic forces without damage, making them suitable for applications like blast shielding and seismic protection.
Implementation Method 1
the compliant layer is formed of a compliant material having an elastic modulus adapted to induce a kinetic oscillation in the inner core when exposed to an energy wave that imparts mechanical energy to the geometric multilayer body within at least one target frequency range
Implementation Method 2
such that the engineered aggregate exhibits a negative effective mass to trap at least a portion of the mechanical energy of the energy wave within the engineered aggregate
Implementation Method 3
The metamaterials effectively absorb and dissipate mechanical energy, reducing stress and enhancing the ability to withstand dynamic forces without damage
Data Source
AI summary
Materials and methods for implementing engineered aggregates in metamaterials are provided. The engineered aggregates may be tuned to oscillate resonantly under the influence of an external force improving the dynamic performance of the metamaterial by impeding dynamic excitation. The engineered aggregate generally comprise a multilayer resonant structure having at least a relatively heavy inner core surrounded by at least a compliant coating layer. The geometry and stiffness of the relative layers can be tuned to engineer a desired resonant frequency response within the aggregate for a chosen frequency range. The engineered aggregates are disposed in a matrix material to form a metamaterial. The engineered aggregates may be disposed within a mortar matrix to form a concrete metamaterial suitable for use, for example, in structural applications, including bunkers, shelters, etc.