Cartridge Case Base Plate Unlocking via Inclined Shape Memory Path
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Solution Overview
Problem
Existing cartridge cases with temperature-dependent shape memory materials face issues with indistinct positioning and potential unintended blocking due to a voluminous space between the base plate and bottom section, leading to delayed or incomplete release of the base plate under heating, which can result in violent reactions during temperature increases.
Innovation Solution
A cartridge case design featuring a motion path inclined backwards within a defined angular range (30-60 degrees) for the shape memory material to follow, ensuring reliable unlocking of the base plate and creating an opening for pressure relief, utilizing a circular ring shape memory material and support rings for precise positioning and movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a voluminous space is provided between the base plate and bottom section to house the shape memory material, then the shape memory material can be positioned in blocked and unblocked positions, but the positioning becomes indistinct and movement between positions becomes unreliable
Solution Approach 1:
The space is segmented into two distinct portions: a first portion in the bottom section and a second portion in the base plate. This segmentation creates a defined motion path that guides the shape memory material through specific positions, ensuring distinct blocked and unblocked states while maintaining reliable positioning.
Solution Approach 2:
An inclined motion path acts as an intermediary mechanism between the blocked and unblocked positions. This inclined path at 30-60 degrees provides a controlled transition route for the shape memory material, ensuring distinct and reliable positioning while accommodating the material's transformation.
2Strength
If the shape memory material is considerably elongated to lock the base plate, then the base plate can be securely locked, but the space required becomes voluminous and positioning becomes difficult
Solution Approach 1:
The shape memory material is repositioned from a horizontal arrangement to an inclined arrangement at 30-60 degrees. This dimensional change allows the material to achieve the necessary locking strength while occupying less volumetric space, as the inclined configuration provides mechanical advantage without requiring a large horizontal space.
Solution Approach 2:
The locking function is segmented into two portions: a first portion of the shape memory material in the bottom section and a second portion in the base plate. This segmentation allows the material to be shorter overall while still providing sufficient locking capability through the distributed arrangement along the inclined motion path.
3Difficulty of detecting and measuring
If the explosive materials expand under heating, then the pressure increases, but the shape memory material may be secured between the base plate and bottom section before critical temperature is reached, delaying or preventing base plate release
Solution Approach 1:
The shape memory material is pre-positioned on the inclined motion path such that when it transforms at the critical temperature, it naturally moves along the inclined path to unlock the base plate. This preliminary positioning ensures that the material is ready to move at the precise moment of transformation, preventing it from being trapped by expanding explosive materials.
Solution Approach 2:
The inclined motion path serves as an intermediary mechanism that facilitates the shape memory material's movement independent of the explosive material's expansion. The inclined geometry provides a predetermined path that guides the material's movement, ensuring timely base plate release even when explosive materials expand and increase pressure.
4Ease of operation
If the shape memory material moves between blocked and unblocked positions, then the base plate can be released, but the movement may be indistinct and unreliable
Solution Approach 1:
The inclined motion path at 30-60 degrees acts as an intermediary that provides a well-defined geometric constraint for the shape memory material's movement. This inclined path ensures that the material follows a specific trajectory from the blocked to the unblocked position, making the movement distinct and reliable rather than ambiguous.
Solution Approach 2:
The motion path is localized to specific portions: a first portion in the bottom section and a second portion in the base plate. This localization creates distinct spatial zones that correspond to blocked and unblocked states, ensuring that the shape memory material's movement is well-defined and reliable.
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 solution provides a reliable and controlled opening mechanism that minimizes violent reactions by ensuring timely and complete release of the base plate, even under heating, maintaining safety and compatibility with standard cartridges.
Implementation Method 1
a base plate locking device comprising a temperature dependent shape memory material
Implementation Method 2
at a temperature increase passes a temperature such that the shape memory struggles to resume a former shape
Data Source
AI summary
The present invention relates to a cartridge case (1) intended for explosive materials comprising a releasable base plate (4) provided in a bottom section (3) of the cartridge case (2) and a base plate locking device (25) comprising a temperature dependent shape memory material (13). The principal object of the invention is to obtain a cartridge case (2) that is more reliable in it operation when subjected to heating. According to the invention a space (12) is provided partly in the bottom section (3) of the cartridge case (2) and partly in the base plate (4) of the cartridge case (2) defining a motion path inclined backwards for the shape memory material (13) to follow when it at a temperature increase passes a temperature such that the shape memory (13) struggles to resume a former shape, resulting in that the base plate (4) is unlocked from the bottom section (3) of the cartridge case (2) and released. The invention also refers to a round of ammunition (1) comprising a cartridge case (2) as above.