Variable-Density Lattice Foam for Lightweight Shock Resistance
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Solution Overview
Problem
Conventional foam materials used for shock resistance in aerospace and electronics applications are heavy and lack sufficient compression strength, necessitating improved systems with reduced weight and increased compression capabilities.
Innovation Solution
A non-metallic lattice structure with varying foam densities across different regions, allowing for customized stiffness and flexibility through additive manufacturing processes like extrusion and 3D printing, incorporating materials such as silicone and urethane, and featuring apertures for cooling fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional uniform foam materials are used for shock resistance, then shock absorption is provided, but weight is excessive and compression strength is insufficient
Solution Approach 1:
The foam structure implements varying cell densities across different regions to provide locally optimized properties. High-density regions with smaller cells provide enhanced compression strength and shock resistance where needed, while low-density regions with larger cells reduce weight in areas requiring less support. This spatial variation in material density resolves the contradiction between strength and weight by distributing material strategically throughout the structure.
Solution Approach 2:
The foam is divided into multiple regions with distinct cell densities, creating a segmented structure with high-density and low-density zones. This segmentation allows different parts of the foam to serve different functions: high-density regions provide structural support and compression resistance, while low-density regions contribute to weight reduction. The segmented approach enables the foam to achieve both high compression strength and low weight simultaneously.
2Strength
If uniform cell density foam is used, then manufacturing is simple, but compression strength and shock resistance are insufficient
Solution Approach 1:
The manufacturing process controls and varies the cell density parameter across different regions of the foam structure. By adjusting the cell density parameter spatially, the foam achieves enhanced compression strength in high-density regions while maintaining manufacturing feasibility through controlled variation rather than complete uniformity. This parameter change approach allows optimization of mechanical properties without prohibitively increasing manufacturing complexity.
3Strength
If high density foam is used throughout, then compression strength increases, but weight increases and cooling efficiency decreases
Solution Approach 1:
The foam structure implements varying cell densities across different regions to provide locally optimized properties. High-density regions with smaller cells provide enhanced compression strength and shock resistance where needed, while low-density regions with larger cells reduce weight in areas requiring less support. This spatial variation in material density resolves the contradiction between strength and weight by distributing material strategically throughout the structure.
4Adaptability or versatility
If custom geometry is required for specific applications, then performance is optimized, but manufacturing complexity and cost increase
Solution Approach 1:
The foam manufacturing process is designed to be universally applicable to various geometries and density distributions. The same additive manufacturing or foaming processes can produce different custom geometries and density patterns by adjusting digital models and process parameters, rather than requiring different manufacturing methods for each application. This universal approach enables custom geometry optimization without proportionally increasing manufacturing complexity.
Data Source
AI summary
A shock resistant body comprises a non-metallic lattice structure having a first region with a first foam density in a first region and a second foam density in a second region that is lower from the first foam density. The first region has solid lattice members of a larger cross-sectional area than those in the second region and the first region has smaller interstices between solid lattice members than those in the second region.