Study on the formation of micro-scale shaped charge jet based on diameter effect

Area of Science:

• Explosives Engineering
• Munitions Science
• Materials Science

Background:

• Shaped charge jets (SCJ) are effective for miniature weapon platforms due to their power and directionality.
• Classical SCJ theory overestimates jet velocity at the micro-scale due to unaddressed size effects.
• Accurate velocity prediction is crucial for optimizing micro-scale SCJ performance.

Purpose of the Study:

• To address the limitations of conventional theory in predicting micro-scale SCJ velocity.
• To develop and validate a modified model accounting for size effects in SCJ.
• To improve the design and optimization of miniature weapon systems utilizing SCJ.

Main Methods:

• Theoretical analysis of size effects on SCJ formation.
• Detonation experiments to verify reduced detonation velocity at micro-scales.
• Refinement of liner collapse and jet velocity formulations based on classical theory and experimental data.
• Validation using pulsed X-ray tests on a 10 mm diameter shaped charge.

Main Results:

• Experimental verification of reduced detonation velocity for smaller diameter charges.
• The modified model accurately predicted measured jet tip velocity ([3077.0 m/s]).
• The modified model reduced prediction error by approximately 20% compared to the conventional model ([3921.5 m/s] vs. [3189.6 m/s]).

Conclusions:

• A size effect significantly impacts SCJ velocity at the micro-scale.
• The refined theoretical model provides accurate predictions for micro-scale SCJ velocity.
• This work offers crucial guidance for designing optimized micro-scale shaped charges.