Linear Shaped Charge Liner Geometry for Stable Jet Cutting
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Solution Overview
Problem
Linear shaped charges face reduced cutting effectiveness due to detachment from target surfaces, leading to decreased penetration depth and increased cut width, especially on complex or wet surfaces, resulting in unpredictable and dangerous cutting outcomes.
Innovation Solution
A linear shaped charge with a V-shaped cross section, featuring a specific apex angle of 101.5 to 106.5 degrees and a stand-off distance of 0.99S to 1.21S, where S is the distance between the liner and the apex, ensuring a more stable and continuous cutting jet that maintains homogeneity and precision, even on irregular surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the charge is applied to a wet or complex surface, then attachment difficulty increases, but cutting effectiveness decreases due to separation
Solution Approach 1:
The invention changes the geometric parameters of the liner and explosive element (apex angle of 101.5-106.5 degrees, stand-off distance ratio of 0.99S to 1.21S) to optimize jet formation and stability, making the cutting action more reliable even when attachment conditions are poor
2Adaptability or versatility
If the stand-off distance is increased due to surface irregularities, then jet stability decreases and break-up occurs, but the charge geometry needs to accommodate varying distances
Solution Approach 1:
The invention optimizes the stand-off distance parameter (SD:S ratio of 0.99 to 1.21) in combination with the apex angle to ensure the jet forms near the target surface, reducing travel distance and maintaining jet homogeneity and stability even when stand-off distance varies due to surface irregularities
3Manufacturing precision
If the apex angle is optimized for jet formation, then cutting precision improves, but manufacturing tolerance requirements increase
Solution Approach 1:
The invention specifies an apex angle range of 101.5 to 106.5 degrees, which is a relatively wide tolerance band that balances cutting precision requirements with manufacturing feasibility, allowing for practical production while maintaining effective jet formation
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 optimized geometry of the charge produces a longer, thinner cutting jet that remains stable and effective over greater distances, ensuring precise cutting and reliability across various target configurations, including complex and wet surfaces, with reduced risk of detachment-induced failures.
Implementation Method 1
when the explosive element is detonated
Implementation Method 2
A linear shaped charge is an explosive device for cutting a target object
Data Source
Figure 1~2
AI summary
The present invention relates to a linear shaped charge (1) comprising an explosive element (2), a liner (4), a face (6) for application to a target object (8) and a space (14) between the liner and the face, the liner being arranged for projection through the space, towards the face, when the explosive element is detonated, and the explosive element and the liner having a V-shaped cross section, the liner (4) lying in a groove of the V-shaped cross section of the explosive element (2), the liner having a length L of a side furthest from the face (6) and the liner (4) having a thickness T taken perpendicular to said length L, wherein an angle a of an apex of the liner nearest the face is 101.5 to 106.5 degrees, and a stand-off distance SD between the face and a point of the liner nearest the face is 0.99S to 1.21S, S being a distance, parallel the stand-off distance SD, between the point of the liner (4) nearest the face (6) and the apex of the liner nearest the face.