Axi-Linear Shaped Charge for Deep Penetration and Slotted Cavities
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Solution Overview
Problem
Conventional shaped explosive devices produce small, inconsistent hole diameters, limiting their effectiveness in penetration and application, particularly in oil well perforation and urban breaching, due to the lack of a combination jet capable of producing both a forward rod and rearward flattened spade shape.
Innovation Solution
A shaped explosive device, termed Axi-Linear, which generates a dual-purpose jet consisting of a forward axisymmetric rod portion and a planar symmetric wide spade portion, achieved through a high explosive billet with distinct sections and a modified liner design that allows for simultaneous initiation and containment, resulting in a velocity gradient from tip to tail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional shaped charge with a hollow conical cavity is used, then high velocity jet penetration is achieved, but the hole diameter is small (less than 15% of charge diameter) and inconsistent
Solution Approach 1:
The liner is segmented into multiple sections with different geometries (conical section, cylindrical section, and fluted section) that collapse at different rates and angles, creating a composite jet structure with both high velocity and expanded diameter. This segmentation allows different portions of the liner to contribute to different aspects of jet performance.
Solution Approach 2:
The liner design incorporates asymmetric fluting and varying wall thicknesses that create controlled collapse patterns, producing a jet with non-uniform velocity distribution that enhances both penetration depth and hole diameter consistency. The asymmetric geometry ensures repeatable collapse behavior.
2Ease of manufacture
If a conventional linear shaped charge with non-fluted liner is used, then the device is simple to manufacture, but insufficient convergence is achieved to cause plastic flow and high velocities
Solution Approach 1:
The liner incorporates curved fluted surfaces and rounded transitions instead of sharp edges, which guide the collapse more effectively and promote uniform plastic flow. The curved geometries are easier to manufacture using standard forming processes while still achieving the desired convergence.
Solution Approach 2:
The liner geometry parameters (flute angle, wall thickness, curvature radius) are optimized to balance manufacturing ease with jet performance. By adjusting these parameters, the design achieves sufficient convergence for high velocity without requiring complex fabrication processes.
3Length of stationary object
If a conventional shaped charge is used for deep penetration, then the jet produces small holes, but follow-through devices cannot be delivered in surgical destruction applications
Solution Approach 1:
The design merges the penetration function (achieved by the high velocity rod-like jet portion) with the hole enlargement function (achieved by the expanded diameter jet portion) into a single charge. The composite jet structure simultaneously delivers both deep penetration and sufficient hole diameter for follow-through device delivery.
Solution Approach 2:
The shaped charge is designed to perform multiple functions: deep penetration, hole enlargement, and creation of a通道 suitable for follow-through devices. This multi-functional capability makes the single charge applicable to both military penetration and surgical destruction scenarios.
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 Axi-Linear device produces a larger, consistent detonation hole with enhanced penetration capabilities, combining deep round penetration with lateral slot creation, improving efficiency and control in target material removal.
Implementation Method 1
When a cylinder of explosive with a hollow conical cavity at one end is detonated at the center of the opposite end, the energy of the explosive is focused into a rod-like jet of high temperature, high pressure and high velocity gases along the axis of a conical cavity. This is an axisymmetric collapse and is generally known as the Munroe effect.
Implementation Method 2
the energy of the explosive is focused into a rod-like jet of high temperature, high pressure and high velocity gases
Implementation Method 3
Plastic flow is accomplished by forcing the liner material under great pressures to collapse and converge radially onto the liners symmetrical axis
Implementation Method 4
the jetting process of a shaped charge requires the liner material to reach a high temperature during collapse, which allows plastic flow of the collapsed liner material that produces a long stretching jet
Data Source
AI summary
This invention is a shaped explosive device with a liner that produces a single combination jet consisting of a forward rod portion and rearward flattened spade shaped portion, this jet has a velocity gradient form tip to tail. The jet produced by the shaped charge is axisymmetric for the forward rod portion and planar symmetric for the aft wide spade portion somewhat like linear shaped charge, thusly termed the “Axi-Linear” shaped charge. The forward rod portion of each jet erodes a round hole in the target followed by the aft flattened spade portion of the jet creating a long slotted deep cavity centered on the round hole and in the lateral direction of the spade jet.