Lead-Free Bullet Fragmentation with Segmented Core Design
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Solution Overview
Problem
Lead-free partial fragmentation bullets often fail to maintain a reliable exit wound due to the rear core detaching from the bullet jacket upon impact, leading to inconsistent penetration and wound formation.
Innovation Solution
A bullet design featuring a rear core with a recess and a nose core separated by a predetermined breaking surface, where the bullet jacket has a peripheral tear-away edge, allowing the jacket to fragment and the rear core to deform, ensuring the rear core covers the junction with the jacket, preventing target medium penetration and maintaining a compact bullet body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rear core is designed to detach from the bullet jacket upon impact, then fragmentation effectiveness is improved, but reliability of exit wound formation deteriorates
Solution Approach 1:
The bullet is segmented into distinct functional zones: a fragmentation zone at the nose containing the ogive core and jacket that detaches upon impact, and a penetration zone at the rear containing the rear core that remains intact. The predetermined breaking surface between these zones enables controlled segmentation, allowing the nose to fragment while the rear core maintains structural integrity for reliable exit wound formation.
Solution Approach 2:
Different parts of the bullet are given different structural properties: the nose region is designed for easy fragmentation with a weak interface between ogive core and jacket, while the rear core is designed for structural strength and stability. This local differentiation allows simultaneous optimization of fragmentation effectiveness and exit wound reliability.
2Stability of the object's composition
If the rear core remains attached to the bullet jacket, then structural integrity is improved, but fragmentation process deteriorates
Solution Approach 1:
The bullet structure is divided into a fragmentation section (nose core and jacket) and a structural support section (rear core). The predetermined breaking surface creates a weak plane that directs fragmentation to occur only in the nose region while the rear core remains structurally intact, resolving the contradiction between maintaining overall structural integrity and enabling effective fragmentation.
3Manufacturing precision
If a predetermined breaking surface is provided between cores, then controlled fragmentation is improved, but complexity of bullet structure deteriorates
Solution Approach 1:
A predetermined breaking surface is pre-formed between the rear core and nose core during the manufacturing process. This preliminary structural feature ensures that upon impact, fragmentation occurs at the predetermined location rather than randomly, providing controlled fragmentation without requiring complex additional mechanisms or assembly steps.
Solution Approach 2:
The breaking surface creates a visual and structural distinction between the fragmentation zone and structural zone. The interface between the rear core and ogive core is designed with different material properties or geometric features that facilitate controlled separation, making the fragmentation process predictable and reliable without adding significant structural complexity.
4Productivity
If the bullet jacket fragments extensively, then wound creation is improved, but penetration consistency deteriorates
Solution Approach 1:
The bullet is segmented into a fragmentation jacket/nose section and an intact rear core section. The jacket and ogive core are designed to fragment and detach upon impact to create effective wound cavities, while the rear core maintains structural integrity to ensure consistent penetration depth and trajectory, resolving the contradiction between wound creation and penetration consistency.
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 enhances the reliability of exit wounds by ensuring the rear core remains integrated with the bullet jacket during deformation, providing consistent penetration and wound formation without medium penetration, thus improving the bullet's fragmentation and wound creation efficacy.
Implementation Method 1
the rear core begins to deform due to the recess and covers the region between the jacket and the core
Implementation Method 2
the rear core begins to deform due to the recess and covers the region between the jacket and the core
Implementation Method 3
the bullet jacket begins fragmenting in a region of the ogive up to the peripheral tear-away edge and the predetermined breaking surface on impact with a target body
Implementation Method 4
When a sufficient force is applied to the deformed bullet jacket, it is separated from the remainder of the bullet jacket by the peripheral tear-away edge
Data Source
AI summary
The invention relates to a lead-free partial fragmentation bullet comprising a bullet jacket, a rear core compressed therein, and a nose core compressed in the ogive region, wherein the tip core sits on the rear core. In order that the rear core does not separate from the contacting bullet jacket upon striking a target body and to thereby guarantee a sure exit wound out of the target body, a predetermined breaking point is proposed which is arranged between the rear core and the nose core. The rear core has a molded recess on the end thereof facing the nose core, the end of the nose core facing the tail core fills in said recess, and the bullet jacket has a peripheral break away edge on the outer circumference in the region of the predetermined breaking point.