Existing theories for rigid body penetration model the target response to a penetration process as a cavity-expansion. A new analysis, however, offers an innovative approach to rigid body penetration of porous geological targets. The theory analyzes the formation of a compacted ring of target material observed around the boreholes in recovered targets. Applying fundamental laws of motion to an element during the formation of the ring leads to estimates for the three stresses that control the penetration event. A retarding force on the projectile nose is derived and then used to arrive at an estimate for penetration depth. The penetration depth equation, resulting from this model, is dependent upon known projectile properties, target material properties, and the impact velocity. Neglected are the effects of friction and shear. The solving procedure returns an estimate for the target yield strength. The model can then be used to predict the penetration of any penetrator into the target material. The results are promising and in agreement with the experimental observations.
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ASME/JSME 2004 Pressure Vessels and Piping Conference
July 25–29, 2004
San Diego, California, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4684-9
PROCEEDINGS PAPER
Strength Estimates for High Velocity Penetration of Geological Targets by the Compaction Ring Theory
D. Zach Nuckols,
D. Zach Nuckols
University of Alabama, Tuscaloosa, AL
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S. E. Jones
S. E. Jones
University of Alabama, Tuscaloosa, AL
Search for other works by this author on:
D. Zach Nuckols
University of Alabama, Tuscaloosa, AL
S. E. Jones
University of Alabama, Tuscaloosa, AL
Paper No:
PVP2004-3046, pp. 173-182; 10 pages
Published Online:
August 12, 2008
Citation
Nuckols, DZ, & Jones, SE. "Strength Estimates for High Velocity Penetration of Geological Targets by the Compaction Ring Theory." Proceedings of the ASME/JSME 2004 Pressure Vessels and Piping Conference. Problems Involving Thermal Hydraulics, Liquid Sloshing, and Extreme Loads on Structures. San Diego, California, USA. July 25–29, 2004. pp. 173-182. ASME. https://doi.org/10.1115/PVP2004-3046
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