Lead-Free Bullets With Compacted Copper Core And Polymeric Seal
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Solution Overview
Problem
Lead-free bullets often fail to match the performance characteristics of traditional lead-containing bullets due to the materials used, lacking the same properties and effectiveness.
Innovation Solution
The development of lead-free bullets with frangible cores, featuring a copper jacket, a compacted plurality of copper particles or metal granules, and a light-cured adhesive or polymeric seal to prevent foreign matter ingress and facilitate dispersion upon impact, enhancing performance and integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If lead-free materials are used in bullets, then health and environmental safety is improved, but performance characteristics deteriorate
Solution Approach 1:
The invention uses a composite structure with a copper jacket and a lead-free core made from compacted copper particles or metal granules. This composite material approach allows the bullet to achieve both safety (lead-free) and performance (comparable to lead bullets) by combining materials with complementary properties - the copper jacket provides structural integrity while the compacted copper particle core provides the necessary density and fragmentation characteristics.
2Object-affected harmful factors
If a copper jacket and compacted copper particles are used, then lead-free performance is achieved, but manufacturing complexity increases
Solution Approach 1:
The bullet is divided into distinct segments: a copper jacket and a separate lead-free core composed of compacted copper particles or metal granules. This segmentation allows each component to be optimized independently - the jacket for structural integrity and the core for fragmentation performance - while simplifying the manufacturing process by enabling separate production and assembly of components.
Solution Approach 2:
A light-cured adhesive or polymeric seal acts as an intermediary between the copper jacket and the lead-free core. This intermediary material bonds the components together, seals the cavity to prevent foreign matter ingress, and facilitates the desired fragmentation behavior upon impact, thereby managing the complexity of combining multiple materials.
3Reliability
If frangible core design is implemented, then kinetic energy transfer is improved, but integrity maintenance becomes more difficult
Solution Approach 1:
The core is designed with specific physical parameters - using compacted copper particles or metal granules with controlled size distribution and compaction density. These parameter changes enable the core to maintain integrity during storage and transport while facilitating controlled fragmentation and energy transfer upon target impact, resolving the contradiction between maintaining strength and enabling energy transfer.
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
These bullets achieve performance comparable to lead-containing bullets by ensuring the compacted core disperses effectively upon impact, maintaining integrity and transferring kinetic energy efficiently, while preventing foreign matter damage and corrosion.
Implementation Method 1
The adhesive has a liquid state and changes to a solid state
Data Source
AI summary
Bullets, including lead-free bullets with frangible cores, are described herein. In some embodiments, a bullet includes a jacket having an inner surface defining a cavity having an open end and a closed end. The bullet also includes a lead-free core positioned within the cavity and extending from the closed end to a first intermediate portion of the cavity. The core includes a plurality of particles that are compacted within the cavity to form the core. The bullet also includes a seal positioned within the cavity and extending from the first intermediate portion to a second intermediate portion of the cavity. The seal abuts the inner surface of the jacket, thereby substantially sealing off the core within the cavity. The bullet may also include a polymeric tip having a forward portion projecting forward from the open end and a rearward portion extending rearward into the cavity.