Energetic Composite Venting via Core-Shell Nanoparticles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current venting systems for rocket motor cases are limited to discrete areas and do not account for heat sources far from defined venting locations, potentially leading to dangerous pressure buildup and explosive ignition during transportation.
Innovation Solution
A fiber reinforced energetic composite with core-shell nanoparticles entrained in a polymer matrix is used to create a passive venting system that allows for venting over the entirety of the rocket motor case, ensuring complete pressure release and preventing explosive ignition by destroying the structural integrity in the event of a fire.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discrete venting mechanisms are used at specific locations, then the venting system is simple and localized, but it cannot account for heat sources far from venting locations and may lead to pressure buildup
Solution Approach 1:
The venting system is segmented into multiple discrete heat-activated vent holes distributed throughout the rocket motor case. Each vent hole contains core-shell nanoparticles that independently activate when exposed to heat, providing localized venting at multiple positions rather than relying on a single centralized venting mechanism.
Solution Approach 2:
The venting capability is transitioned from discrete localized points to a distributed three-dimensional network throughout the motor case. By embedding vent holes and core-shell nanoparticles within the composite structure at multiple locations, the system achieves omnidirectional heat response and pressure relief in all spatial dimensions.
2Productivity
If conventional polymer matrix composites are used, then the structural integrity is maintained, but the material cannot rapidly destroy structural integrity to release pressure during fast cook-off events
Solution Approach 1:
The material undergoes dramatic parameter changes during thermal exposure. The core-shell nanoparticles transform the polymer matrix from a strong structural material to a weakened, porous structure through rapid decomposition and gas generation, enabling transition from integrity maintenance to rapid pressure release based on thermal conditions.
Solution Approach 2:
The system uses a composite material combining polymer matrix with core-shell nanoparticle inclusions. This composite provides dual functionality: maintaining structural integrity under normal conditions while enabling rapid pressure release through the nanoparticle-mediated decomposition mechanism when exposed to heat.
3Reliability
If core-shell nanoparticles with metal core and metal oxide shell are used, then the energetic polymer nanocomposite provides fast cook-off protection, but the manufacturing process becomes more complex
Solution Approach 1:
The core-shell nanoparticles are designed to be self-activating and self-regulating. When exposed to heat, they automatically undergo the desired chemical reactions to generate gas and weaken the matrix without requiring external control systems, sensors, or activation mechanisms, thereby simplifying the overall system manufacturing despite the complexity of nanoparticle synthesis.
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 system effectively mitigates fast cook-off events by allowing for uniform venting and rapid pressure release, reducing the risk of explosive spray and fire distribution over a larger area.
Implementation Method 1
The core-shell nanoparticles include a core made of a metal and at least one shell layer made of a metal oxide disposed on the core. The metal and metal oxide forming a thermite.
Data Source
AI summary
A method of making a fiber reinforced energetic composite is provided. The method includes providing a mold or mandrel defining a shape for the fiber reinforced energetic composite, providing an impregnated fiber layup over the mold or mandrel, and curing the impregnated fiber layup. The impregnated fiber layup includes a fiber layup and polymer resin, the fiber layup formed from a plurality of reinforcing fiber layers and an energetic polymer nanocomposite disposed adjacent one or more of the reinforcing fiber layers with the polymer resin impregnated within the reinforcing fiber layers. The energetic polymer nanocomposite includes core-shell nanoparticles entrained in a thermoplastic polymer matrix where the core-shell nanoparticles include a core made of metal and at least one shell layer made of metal oxide disposed on the core or a core made of metal oxide and at least one shell layer made of metal disposed on the core.