Eutectic Solder Safety Valve for Ammunition Can Venting
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Solution Overview
Problem
Military ammunition cans lack a means to vent cook-off gases generated at elevated temperatures, risking fragmentation and non-insensitive munition compliance in environments like fires or deserts.
Innovation Solution
Incorporating a safety valve with a support ring and vent cover assembly into the ammunition can, sealed with eutectic solder that melts at elevated temperatures to release vent cover and vent gases, maintaining structural integrity and environmental seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ammunition can is sealed to maintain environmental protection and structural integrity, then reliability and strength are improved, but the ability to vent cook-off gases at elevated temperatures deteriorates
Solution Approach 1:
The sealant material's phase change temperature is specifically selected to be above normal operating temperatures but below cook-off temperatures. This parameter change allows the seal to remain intact during normal use but automatically fail and vent when exposed to cook-off conditions, resolving the contradiction between maintaining seal reliability and enabling gas venting.
Solution Approach 2:
The ammunition can's own thermal energy during cook-off conditions automatically triggers the venting mechanism through the phase change of the sealant material. No external activation or additional power source is needed - the system uses the harmful thermal energy itself to activate the protective venting function, eliminating the need for complex external control systems.
2Strength
If an ammunition can is sealed to maintain structural integrity, then strength is improved, but the ability to automatically vent at elevated temperatures deteriorates
Solution Approach 1:
The sealant material undergoes a parameter change (phase transition from solid to liquid) at a specific temperature threshold. This allows the ammunition can to maintain strong sealing under normal conditions while automatically adapting to vent gases when temperature exceeds the threshold, resolving the contradiction between structural integrity and temperature adaptability.
Solution Approach 2:
The ammunition can employs a composite sealing system combining a rigid structural component with a temperature-responsive sealant material. This composite approach allows the can to maintain overall structural strength while incorporating the adaptive temperature-response capability of the specialized sealant, resolving the contradiction between strength and adaptability.
3Object-affected harmful factors
If a vent mechanism is added to allow gas venting, then the ability to vent cook-off gases is improved, but device complexity increases
Solution Approach 1:
The venting mechanism is activated automatically by the phase change of the sealant material in response to temperature increase. The system serves itself by using the thermal energy from cook-off conditions to trigger the venting action without requiring external control systems, motors, or complex mechanisms, thus improving gas venting capability while minimizing added complexity.
Solution Approach 2:
The venting mechanism utilizes the phase transition of the sealant material from solid to liquid at elevated temperatures. This natural physical phenomenon provides the driving force for venting without requiring additional mechanical complexity, as the phase change itself creates the pressure differential needed to open the vent path.
4Reliability
If a vent mechanism is added to vent cook-off gases, then safety is improved, but manufacturing complexity increases
Solution Approach 1:
The venting function is merged with the existing closure assembly of the ammunition can. The temperature-responsive sealant is integrated into the normal sealing structure, allowing the venting capability to be achieved by modifying an existing component rather than adding a separate complex assembly, thus improving safety while minimizing manufacturing complexity.
Solution Approach 2:
The manufacturing process is simplified by selecting a sealant material with a predetermined phase change temperature that can be applied using standard sealing techniques. The safety function is achieved through material selection rather than complex assembly procedures, improving safety while maintaining ease of manufacture.
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
Effectively vents cook-off gases without compromising the structural integrity of the ammunition can, preventing fragmentation and ensuring compliance with insensitive munition standards in high-temperature environments.
Implementation Method 1
The seal between the support ring and vent cover is a eutectic material which turns from a solid to a liquid at a predetermined elevated temperature, thereby releasing the vent cover, and venting the ammunition can of cook-off gases.
Data Source
AI summary
A safety valve is provided for metallic ammunition cans having lids which form an environmental seals when closed, the safety valve automatically vents cook-off gases generated when ammunition or other energetic in the ammunition can reach elevated temperatures. The safety valve is deployed in a hole formed in a wall of the ammunition can. The safety valve employs a vent cover which is soldered by means of a eutectic material either directly to an outer surface of the ammunition can or to an insert extending through the hole in the wall of the ammunition can. The vent cover seals gases in the ammunition can until elevated temperatures cause eutectic solder to melt thus freeing a vent cover and releasing cook-off gases from inside of the ammunition can.