analysis and simulations of low power plasma blasting for processing lunar materials v.1
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S P A C E
R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Analysis and Simulations of Low Analysis and Simulations of Low Power Plasma Blasting for Processing Power Plasma Blasting for Processing
Lunar MaterialsLunar Materials
MartMartíín E. Baltazar-Ln E. Baltazar-Lóópez, Steve Best, pez, Steve Best, Henry W. Brandhorst, Jr., Zachary M. BurellHenry W. Brandhorst, Jr., Zachary M. Burell
Space Research Institute, Auburn University, AL 36849-5320
Matthew E. Heffernan and Frank RoseMatthew E. Heffernan and Frank RoseRadiance Technologies, Auburn, AL, 36849
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S P A C E
R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Overview
• Introduction• Objectives• Experiments with Plasma Blasting• Numerical simulation• Results• Conclusions
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S P A C E
R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Introduction
Significant transportation cost
Safety concerns
Complications of Drilling and excavating on the Moon’s surface
Chemical explosives
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S P A C E
R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Introduction
Plasma Blasting is analternative method for surface blasting
Incorporates the use of electrically powered
plasma blasting
Allows easily adjusted explosive yield control for
additional safety
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S P A C E
R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Introduction
Minimal scattering of fly-rock
No chemical reaction inert, non-explosive
Reusable discharge portion
Reduced equipment mass
Potential advantages
for space application
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S P A C E
R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Introduction
Such a system was developed and successfully tested at the
Space Research Institute (SRI) facilities
ProbeInductorCapacitor 1
Capacitor 2
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S P A C E
R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Introduction
Experimental testing with plasma blasting
can be expensive
… and time-consuming
sometimes several tests are needed in order to obtain a single valid data point
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S P A C E
R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Introduction
• To complement and validate the experimentation
•To predict the volume to be blasted and correlate with energy levels
• Could even be used as an alternative to experimentation… within certain limits
Need of Simulation
with the corresponding savings in time and money
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S P A C E
R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Objectives
Apply numerical techniques to analyze Apply numerical techniques to analyze and simulate the capabilities of the plasma and simulate the capabilities of the plasma blaster to be used in space missions.blaster to be used in space missions.
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R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Experiments with Plasma Blasting Technology
Blasting test on a 24” dia. X 36” long,concrete cylinder sample (non-reinforced) with 12” probe and 52kJ pulse
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R E S E A R C H
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Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Experiments with Plasma Blasting Technology
Test setup characteristics of 24” dia. X 36” long, steel-reinforced concrete cylinder sample
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R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Experiments with Plasma Blasting Technology
Steel-Reinforced concrete cylinder 6.2 ft3 (0.17m3) after blast test
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S P A C E
R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Experiments with Plasma Blasting Technology
Blast test shot on granite rock, with 12” Probe and 52kJ pulse
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S P A C E
R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Numerical methods to simulate blasting
Finite volume Finite differenceFinite element method with explicit time integration scheme
Numerical methods used to simulate the blast
effects problems
Hydrocodes
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R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Numerical methods to simulate blasting
Hydrocodes …
Extensively used to simulate explosions and other high rate events
•High pressures (Giga Pascal range)
•Thermodynamic influences
•High strain rates
originated by chemical explosives.
…but…
Incipiently used to model plasma blasting
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I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Numerical methods to simulate blasting
In this work, ANSYS AUTODYN, a three dimensional hydrocode is used to simulate the plasma blasting of concrete samples
with the purpose of getting an estimation of the damage of plasma blasting and then to validate those simulations with experimental results.
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R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Hydro-code simulations
•Model electro-hydraulic loading on concrete cylinders using 2-D and 3-D axial symmetry.
•Concrete was modeled using a porous EOS and a Drucker-Prager strength model.
• Determined that the Drucker-Prager criterion gave the best results for this application based upon previous physical observations
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R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Hydro-code simulations
•The program has the option to present the results in terms of damage with a relative scale going from zero to one, and graphically with a scale of colors
• is possible to specify stochastic failure mechanism to take into account the heterogeneities in material .
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R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Results
2-D simulations demonstrated congruence between numerical and experimental results for blastsperformed on 12’’ and 18’’ concrete cylinders
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R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Results
24”x 36” cylindrical concrete sample models after 300µs simulation time of a 600MPa blast @ 60µs pulse width
(a) y-plane view of 3D simulation and (b) 2D simulation
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R E S E A R C H
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Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Results
Time-history sequence of cracks and damaged zones
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R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Results
Cracks and damage
along different radial planes after 300µs simulation
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R E S E A R C H
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Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Results
Cracks and damage along different longitudinal planes after 300µs simulation
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S P A C E
R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Results
Damage sequence transparent view
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S P A C E
R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Summary and Conclusions
• Experiments of plasma blasting on concrete and granite rocks were performed with the purpose to emulate rocks and lunar soil.
• Two and three dimensional simulations of plasma blasting on concrete samples were performed.
• The mechanisms of damage and failure of plasma blasting can be simulated by hydrocodes and the solutions are very congruent with the experimental results.
• The heterogeneous nature of blasted concrete samples was numerically verified by the asymmetry of cracks and damage along different radial and longitudinal (transversal) planes.
• It is possible to analyze various structural response situations including damage and failure over a wide range of loading conditions without the need of setting up an experimental rig for each analysis, realizing a savings in time and experimental costs.
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S P A C E
R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
Acknowledgements
• This work was supported under NASA Contract No. 07-060287 , “Highly Efficient High Peak Power Electrical Systems for Space Applications” funded through Radiance Technologies, Inc.
• Any opinions expressed are those of the authors and do not necessarily reflect the views of NASA.
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S P A C E
R E S E A R C H
I N S T I T U T E
Auburn University
Analysis and Simulations of Low Power Plasma Blasting for Processing Lunar Materials
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