Cartridge Adhesive Damping Layer for Propellant Case Protection
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Solution Overview
Problem
Existing cartridges face damage to the propellant charge case due to environmental stress-induced inertia forces from heavy projectiles, which cannot be mitigated by increasing the wall thickness of the propellant charge case without compromising internal ballistics.
Innovation Solution
Incorporating a damping element, specifically a silicone adhesive with a layer thickness of at least 300 μm, between the projectile and the case cover, which also serves as a spacer to absorb vibrations and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the wall thickness of the propellant charge case is increased to absorb inertia forces from heavy projectiles, then the strength and damage resistance of the case is improved, but the internal ballistics performance deteriorates due to the increased outer diameter constraint
Solution Approach 1:
The patent divides the damping function into two separate components: the propellant charge case maintains its original thin-walled design for optimal ballistics, while a separate damping element (adhesive layer with rubber particles) is introduced between the projectile and case cover. This segmentation allows each component to perform its specialized function without compromising the other.
Solution Approach 2:
The patent introduces an intermediary damping element consisting of an adhesive layer containing rubber particles. This intermediary component absorbs inertia forces and vibrations from the heavy projectile, protecting the propellant charge case while allowing the case to maintain its original thin-walled structure for optimal internal ballistics.
2Reliability
If a damping element is introduced between the projectile and case cover to absorb inertia forces, then the damage resistance of the propellant charge case is improved, but the device complexity increases
Solution Approach 1:
The patent merges the damping function into the adhesive layer that already exists in the cartridge structure. By incorporating rubber particles directly into the adhesive material, the damping function is combined with the existing bonding function, eliminating the need for separate damping components and minimizing structural complexity.
Solution Approach 2:
The adhesive layer serves multiple functions simultaneously: it bonds the case cover to the projectile and provides damping to absorb inertia forces. This multi-functionality reduces the need for additional components, thereby limiting the increase in device complexity while improving damage resistance.
3Device complexity
If a thin adhesive layer is used for bonding the case cover to the projectile, then the device complexity is minimized, but the damping capacity is insufficient to protect against environmental stress
Solution Approach 1:
The patent changes the physical-chemical parameters of the adhesive material by incorporating rubber particles with specific size ranges (0.1-10 mm) and optimizing the adhesive layer thickness (0.5-5 mm). These parameter changes enhance the damping capacity of the adhesive layer while maintaining a relatively simple application process.
Solution Approach 2:
The patent uses a composite adhesive material consisting of a base adhesive combined with rubber particles. This composite structure provides both bonding strength and damping capacity, allowing the thin layer to effectively protect against vibration damage from environmental pollution while keeping the overall device complexity low.
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
Significantly reduces the likelihood of propellant charge case damage from environmental stress, maintaining the structural integrity of the cartridge while ensuring accurate detachment of the sabot for improved hit accuracy.
Implementation Method 1
the adhesive between the projectile and the case cover of the propellant charge case as a damping element
Implementation Method 2
an adhesive consisting of an elastic material, which connects the case cover to the projectile
Implementation Method 3
the adhesive between the projectile and the case cover of the propellant charge case
Data Source
Figure 1
AI summary
The invention relates to a cartridge comprising a combustible propellant charge casing consisting of a casing exterior and a casing cover (5), and a fin-stabilized projectile (1) having a solid projectile body (2) and a fin carrier (3) adjoining the rear end of the projectile body (2), the transitional zone between the projectile body (2) and the fin carrier (3) having a frusto-conical outer edge contour (4) which tapers towards the rear end of the projectile (1), to which contour the casing cover (5) which has a matching inner edge contour (7) is non-positively connected with the aid of an adhesive (6). In order to avoid damages to the propellant charge casing caused by the full caliber projectile under the effect of environmental loads, the adhesive (6) is designed as a damper between the projectile (1) and the casing cover (5) of the propellant charge casing.