Composite Laminates with Vertically Aligned Carbon Nanotubes for Impact Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current impact protection systems are heavy, restrictive, and often suffer from weight limitations and inadequate performance under repeated impacts, particularly in ceramic and metallic compositions, which can lead to damage and reduced protective capabilities.
Innovation Solution
A composite laminate incorporating vertically aligned carbon nanotubes (VACNTs) sandwiched between layers of reinforcing fibers, infused with a polymer resin, to enhance through-thickness impact performance while maintaining in-plane stiffness, using methods like layup and vacuum-assisted resin transfer molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ceramic and metallic compositions are used for impact protection, then protective capability is provided, but weight increases and chemical composition restrictions prevent significant weight reduction
Solution Approach 1:
The patent uses a composite laminate structure combining carbon fiber reinforced plastic layers with vertically aligned carbon nanotube (VACNT) forests. This composite approach leverages the high strength-to-weight ratio of carbon fibers while the VACNTs provide through-thickness reinforcement, achieving impact protection with significantly reduced weight compared to traditional ceramic or metallic systems
Solution Approach 2:
The vertically aligned carbon nanotubes are strategically positioned at the interfaces between carbon fiber plies, providing localized reinforcement specifically where through-thickness impact forces are most severe. This local quality enhancement allows weight reduction in non-critical areas while maintaining protective capability where needed
2Weight of moving object
If CFRP is used for impact protection, then weight is reduced and strength-to-weight ratio is improved, but through-thickness performance is insufficient under impact load
Solution Approach 1:
The patent introduces vertically aligned carbon nanotubes that extend in the through-thickness direction (z-axis), adding dimensional reinforcement to the traditionally in-plane optimized CFRP structure. This dimensional enhancement provides the missing through-thickness stiffness and strength while maintaining the low weight advantage of CFRP
Solution Approach 2:
The integration of VACNTs with carbon fiber plies creates a hybrid composite material system where the nanotubes bridge the polymer resin layers between fiber plies, providing through-thickness load transfer capability that pure CFRP lacks, while maintaining overall light weight
3Strength
If ceramic systems are used for impact protection, then protection is provided, but singular impacts result in large fractured sections along grain boundaries that inhibit protective capabilities
Solution Approach 1:
The vertically aligned carbon nanotube forest structure acts as a porous, hierarchical architecture that dissipates impact energy through controlled deformation and buckling of individual nanotubes. This prevents the catastrophic fracture propagation seen in ceramic systems, as the nanotube forest gradually absorbs energy rather than failing suddenly along grain boundaries
Solution Approach 2:
The composite laminate structure with VACNTs embedded between carbon fiber plies creates a damage-tolerant system where localized damage does not propagate catastrophically. The nanotubes bridge cracks and distribute stresses, preventing the large fractured sections characteristic of ceramic systems and maintaining protective capability after impact
4Strength
If traditional impact protection systems are used, then protection is provided, but they are heavy and restrictive
Solution Approach 1:
The patent employs a composite laminate of carbon fiber reinforced plastic with vertically aligned carbon nanotubes, achieving impact protection with weight significantly lower than traditional heavy systems while maintaining or improving protective capability through the synergistic combination of materials
Solution Approach 2:
The invention changes the material parameters by introducing nanoscale reinforcement (VACNTs) with exceptional mechanical properties, including tensile strength and stiffness at the nanometer scale. This parameter change at the microstructural level enables weight reduction while maintaining macroscopic protective performance
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 laminate provides improved impact protection by increasing the duration of an impact event, reducing impact force, and enhancing energy dissipation, while maintaining light weight and versatility across various impact velocities.
Implementation Method 1
The composite laminate provides improved impact protection by increasing the duration of an impact event, reducing impact force, and enhancing energy dissipation
Implementation Method 2
The resin may solidify the fabric plies of composite laminate but not penetrate the at least one VACNT
Implementation Method 3
The at least one layer of CNT forest may be synthesized on the substrate through chemical vapor deposition (CVD)
Implementation Method 4
The substrate may be thermally oxidized silicon
Data Source
AI summary
Laminated composite structures, or laminates, may utilize vertically aligned carbon nanotubes (VACNTs), also termed a nanotube forest, as a layer/ply within a fiber/matrix laminate used as a protection system to mitigate and eliminate penetrating and blunt force damage posterior as a result of impacts with an unknown velocity on the laminated structure. Moreover, a composite may incorporate vertically aligned carbon nanotubes (VACNTs) for ballistic and low velocity impact protection.