Self-Heating Self-Sealing Fuel Bladder
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Solution Overview
Problem
Current materials that expand due to temperature increases are not capable of self-sealing fuel bladders after a puncture or crushing impact without external stimuli, and existing self-healing materials are not designed for significant expansion or effective in sealing fuel leaks quickly.
Innovation Solution
A self-heating and self-sealing bladder formulation that includes a fuel barrier, reinforcement plies, and a self-heating material with microballoon powder and reactive salt powders in pouches, which generate heat and expand upon activation, allowing for self-sealing without chemical reaction with fuel, and can be used in various applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If natural gum rubber is used for self-sealing, then the material swells in fuel to seal wounds, but the expansion is slow allowing significant fuel leakage before sealing
Solution Approach 1:
The patent changes the activation parameter from fuel contact to heat exposure. The intumescent material is designed to expand when exposed to heat from a heat source (such as a candle or lighter), rather than relying on slow fuel-induced swelling. This parameter change enables rapid sealing within seconds of heat application, solving the speed problem while maintaining sealing effectiveness.
Solution Approach 2:
The sealing material is pre-positioned in a compressed state within the bladder wall structure. When heat is applied, the material rapidly expands from this pre-positioned state to seal the puncture. This preliminary positioning ensures the material is ready for immediate activation and can quickly reach the puncture site without delay.
2Reliability
If synthetic polymers like SBS are used for self-sealing, then the material can swell in fuel, but a significant amount of material is required which increases vehicle weight
Solution Approach 1:
The patent switches from fuel-based activation to heat-based activation. The intumescent material responds to thermal energy rather than chemical interaction with fuel, allowing for much thinner and lighter material layers. This parameter change reduces the quantity of sealing material needed while maintaining or improving sealing effectiveness, thereby reducing overall bladder weight.
Solution Approach 2:
The patent uses composite intumescent materials that combine expandable particles or polymers with binders in a thin layer configuration. These composite structures provide high sealing efficiency in a minimal thickness, achieving effective self-sealing with significantly reduced material quantity and weight compared to traditional synthetic polymer approaches.
3Shape
If intumescent materials are used for fire protection, then the material expands when exposed to external heat, but these materials have not been used for self-sealing fuel bladders without external heat sources
Solution Approach 1:
The patent implements a self-service sealing system where the bladder itself provides the heat source for activation. A sacrificial fuel reservoir or integrated heating element within the bladder structure generates heat automatically upon puncture or damage, which then triggers the intumescent material to expand and seal the breach. This eliminates the need for external heat sources or manual intervention, making the system fully autonomous.
Solution Approach 2:
The patent incorporates a preliminary heating mechanism or heat-generating component within the bladder structure that is pre-positioned to activate the intumescent material. This preliminary action ensures that when damage occurs, heat is immediately available to trigger expansion, removing the dependency on external heat sources and enabling automatic self-sealing operation.
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 bladder effectively self-seals punctures and crushes by generating heat and expanding, reducing fuel leakage and maintaining crashworthiness without external heat sources, and can be used in diverse applications beyond fuel bladders.
Implementation Method 1
a self-heating material with microballoon powder and reactive salt powders in pouches, which generate heat and expand upon activation
Implementation Method 2
a material formulation that expands significantly, and one method to create significant expansion of a material is to foam the material upon heating
Implementation Method 3
Intumescent materials rely on external heat sources, so a material formulation that also generates its own heat after a puncture or mechanical shock is necessary for self-sealing
Implementation Method 4
the material is contained within a heat-shrinking polymer to pull the material into a wound and apply pressure
Data Source
AI summary
A self-heating and self-sealing bladder comprising of a fuel and water resistant layer overlaid on a mold; an adhesive tack layer overlaid on the fuel and water resistant layer; a first fabric reinforcement layer overlaid on the adhesive tack layer; a microballoon powder, water containing microspheres, and reactive salt powders disposed in a plurality of pouches such that upon activation the microballoon powder and the reactive salt powders come in contact with the water and react to create a formulation that results in heat and expansion, thus a self-sealing capability; and, a second fabric reinforcement layer overlaid the plurality of pouches.