Shaped Charge Liner Collapse Analysis Using Partial Detonation
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Solution Overview
Problem
Current methods for analyzing early-stage liner collapse in shaped charges are complex, expensive, and do not provide a physical sample suitable for metallurgical testing due to the extreme conditions of the explosive event, which makes it difficult to distinguish early-stage deformation from late-stage deformation and recover intact liner material for analysis.
Innovation Solution
A method involving a test fixture with a reduced amount of explosive material (1-10% explosive matter) coupled to a liner material, detonated within a fluid container, allowing for the recovery and analysis of the liner material's early-stage deformation through metallurgical testing, using rate pins to measure deformation and velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional jet capture testing is used to analyze liner collapse, then the explosive event can be captured, but the liner material undergoes complete deformation and breaks into pieces making it unusable for metallurgical testing
Solution Approach 1:
The patent uses a reduced amount of explosive material (1-10% explosive matter) compared to traditional shaped charges. This partial action allows the liner to undergo only early-stage deformation without complete collapse and fragmentation, preserving the liner material for metallurgical analysis while still capturing the initial collapse dynamics
Solution Approach 2:
The patent introduces a fluid medium as an intermediary between the shaped charge and the collection system. The fluid contains the explosive event, protects the liner material from complete disintegration, and facilitates recovery of intact or partially deformed liner samples for metallurgical testing
2Measurement precision
If flight flash X-ray is used to show jet elongation, then in-flight jet formation can be visualized, but liner collapse and early jet formation are not shown
Solution Approach 1:
The patent performs the explosive event in a controlled fluid environment before flight, allowing early-stage liner collapse and jet formation to occur under controlled conditions. Rate pins are positioned to measure deformation at these early stages, capturing information that would otherwise be lost before flight elongation occurs
Solution Approach 2:
The patent replaces flight-based optical measurement systems with a ground-based mechanical measurement system using rate pins. These pins physically measure liner deformation and velocity during the explosive event in fluid, providing direct mechanical data about early-stage collapse without relying on optical visualization that misses early events
3Loss of information
If computer simulations are used to approximate liner collapse, then early-stage collapse can be modeled, but no physical sample is produced for metallurgical testing
Solution Approach 1:
The patent creates a physical copy or replica of the early-stage collapse process by conducting controlled explosive events in fluid. This produces actual physical samples of liner material that have undergone early-stage deformation, serving as a tangible copy of the process that computer simulations only approximate mathematically
Solution Approach 2:
The patent changes the environmental parameters by conducting the explosive event in a fluid medium rather than in air or vacuum. This parameter change allows for the production of recoverable physical samples while maintaining the essential physics of early-stage liner collapse, enabling metallurgical analysis of actual deformed material
4Manufacturing precision
If reduced explosive material (1-10% explosive matter) is used, then liner material can be recovered for analysis, but the explosive event intensity is reduced
Solution Approach 1:
The patent deliberately uses partial action with reduced explosive material (1-10% explosive matter) to achieve the desired effect of early-stage deformation without complete liner collapse. This partial explosive event is sufficient to capture the initial collapse dynamics and produce recoverable liner samples, while avoiding the excessive intensity that would destroy the material
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
Enables the recovery and analysis of a physical sample of the liner material for early-stage deformation, providing an inexpensive and accurate method to investigate the effects of subtle alterations in shaped charge liner metallurgy, avoiding the limitations of traditional methods like jet capture testing and computer simulations.
Implementation Method 1
detonating the shaped charge
Implementation Method 2
coupling an explosive material to a liner material to define a shaped charge
Implementation Method 3
positioning the assembled testing apparatus and shaped charge within a container of fluid and below a surface of the fluid
Data Source
AI summary
An apparatus and method for investigating and analyzing early shaped charge liner collapse and liner material, wherein such method uses material from an actual liner, in order to collect data on the explosive event and its impact on the material.