Bonded Core Jacket Bullets for Bone Impact Integrity
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Solution Overview
Problem
Conventional hunting projectiles with non-bonded dense cores tend to break apart upon hitting bones, leading to poor penetration and potential lead contamination of animal tissue, as they lack the necessary structural integrity and weight retention.
Innovation Solution
A projectile design featuring a jacket with a bonded dense core, where the dense core is securely attached to the sidewalls of the rearward cavity, allowing the jacket to form petals and cover the core during upset, preventing exposure and maintaining weight retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the dense core is pressure fit within the rear cavity without bonding, then the projectile can be manufactured simpler and with less cost, but the projectiles break apart when hitting heavy bones, leading to loss of structural integrity and weight retention
Solution Approach 1:
The projectile is divided into distinct components: a jacket portion and a separate dense core, which are then joined together through bonding. This segmentation allows each component to be manufactured independently with optimized properties, while the bonding process creates a reliable composite structure that maintains integrity upon impact.
Solution Approach 2:
The patent creates a composite structure by bonding a dense core (such as lead or other heavy materials) to a jacket portion. This composite design combines the high density and penetration capability of the core with the structural integrity and controlled expansion properties of the jacket, resulting in a projectile that maintains both simplicity in manufacture and reliability in performance.
2Productivity
If the dense core is not bonded to the sidewalls, then the manufacturing process is simpler and faster, but the dense core is exposed to upset media when the jacket peels back, causing contamination and weight loss
Solution Approach 1:
The dense core is bonded to the interior surface of the jacket portion before the jacket is formed into its final configuration. This preliminary bonding action ensures that when the jacket peels back during impact, the core remains securely enclosed and protected from exposure to the target medium, preventing contamination while maintaining manufacturing efficiency.
3Use of energy by moving object
If the jacket forms petals that peel back during impact, then the projectile expands effectively to increase energy transfer, but the dense core becomes exposed and the projectile loses weight and structural integrity
Solution Approach 1:
The dense core is pre-bonded to the jacket's interior surface before impact occurs. This preliminary attachment ensures that when the jacket material peels back to form expanding petals during impact, the core remains securely enclosed within the jacket structure. This allows the jacket to expand effectively for energy transfer while the bonded core prevents weight loss and maintains structural integrity throughout the penetration process.
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 bonded core design enhances penetration depth, retains weight, and prevents lead contamination by ensuring the dense core remains covered, even upon impact with bones, thereby improving the projectile's performance and safety.
Implementation Method 1
the sidewalls and the dense core axially compress and radially expand to define a bulge portion
Implementation Method 2
the sidewalls and the dense core axially compress and radially expand to define a bulge portion
Implementation Method 3
the jacket material substantially covering the dense core material thereby inhibiting exposure of the dense core material to the upset media
Data Source
AI summary
A projectile according to exemplary embodiments generally includes a jacket with nose, middle, and heel portions. The nose portion includes a forward cavity. The heel portion includes a rearward cavity having sidewalls. A dense core is within the rearward cavity and bonded to the sidewalls. Upon upset of the projectile, the portion of the jacket forming the forward cavity peels generally back toward the heel portion thereby forming petals, and the sidewalls and the dense core axially compress and radially expand to define a bulge portion, with the jacket material substantially covering the dense core material thereby inhibiting exposure of the dense core material to the upset media.