Projectile Tip Axial Mobility for Internal Pressure Venting
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Solution Overview
Problem
Existing projectiles face issues with high internal pressure due to explosive outgassing at elevated temperatures, leading to potential violent reactions and hazards, as the projectile tip is securely fastened and cannot vent pressure effectively, risking detachment and environmental danger.
Innovation Solution
A projectile design featuring a pressure-related axial relative mobility of the tip within the casing, utilizing a shearable threaded connection that opens ventilation channels to reduce pressure while a stop mechanism prevents the tip from separating, ensuring secure retention and controlled venting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the projectile tip is firmly screwed into the projectile casing with high torque, then the connection strength is improved, but the internal pressure cannot be reduced when explosives outgas at high temperatures, leading to violent reactions
Solution Approach 1:
The threaded connection transitions from a static firmly-screwed state to a dynamic state where the projectile tip can move axially relative to the casing when internal pressure exceeds the holding force of the threaded connection, enabling pressure relief while maintaining secure attachment under normal conditions
Solution Approach 2:
The threaded connection is designed with specific parameters (thread depth, pitch, engagement length) that create a holding force sufficient for normal operation but insufficient to prevent movement when internal pressure reaches a critical threshold, allowing the system to switch between secure attachment and pressure venting states
2Object-affected harmful factors
If ventilation channels are provided to reduce internal pressure, then the internal pressure is reduced, but the projectile tip may detach from the projectile casing due to high pressure
Solution Approach 1:
The system dynamically adjusts the attachment state: under normal pressure the threaded connection maintains secure attachment, but under high pressure the connection allows controlled movement to open ventilation channels while the stop element prevents complete detachment
Solution Approach 2:
The stop element is pre-positioned to limit the axial movement of the projectile tip, providing a safety mechanism that prevents detachment before it can occur, allowing pressure venting while maintaining attachment stability
3Object-affected harmful factors
If plastic plugs are used to close ventilation channels, then the ventilation channels are sealed, but the plugs may not be pushed out completely or may detach, leaving individual parts
Solution Approach 1:
The plastic plugs are extracted from the system entirely, replacing them with a design where the projectile tip itself moves to open ventilation channels, eliminating the risk of plug detachment or incomplete ejection while maintaining pressure containment and venting functions
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
This design effectively reduces internal pressure through controlled venting while maintaining the projectile tip's secure attachment to the casing, preventing detachment and minimizing the risk of accidental ignition and environmental hazards.
Implementation Method 1
a threaded connection is realized with the external thread of the bullet tip and the internal thread of the ring screwed onto it, which is designed in such a way that when a defined axially directed force is applied, which is generated by the high internal pressure, shears off, thus destroying the threaded connection
Implementation Method 2
If such a projectile is exposed to high temperatures, for example in the event of a fire, the explosive begins to outgas due to the increased temperature inside the projectile. A high internal pressure is therefore formed
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
Projectile comprising a projectile casing containing explosive material, in which a projectile tip containing a detonator is inserted, wherein the projectile tip (4) is movable axially against a stop (24) by means of a gas pressure building up in the interior of the projectile (1) relative to the projectile casing (2) by means of a gas pressure relative to a projectile casing (2) by opening at least one vent channel (16) connecting the interior of the projectile casing (2) with the environment.