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Permanent link (DOI): https://doi.org/10.7939/R3RB6WG2D

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Debris Field Kinetics during the Dynamic Fragmentation of Polyphase Natural Ceramic Blocks: Ejecta Measurements and Damage Modes Open Access

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Author or creator
Hogan, James
Vincent, Gregory
Rogers, Robert
Spray, John
Schneider, Markus
Additional contributors
Subject/Keyword
Particle tracking velocimetry
Railguns
Brittle fracture
Dynamic fragmentation
Ejecta measurements
Planetary materials
Brittle materials
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
The dynamic fragmentation of coarse and fine grained granitoid blocks during impact has been examined for energies of 1.9 kJ to 3.0 kJ and 2.7 kJ to 6.8 kJ, respectively. A particle tracking algorithm was developed to measure ejecta size and velocity at the rear of the target for a horizontal railgun arrangement. Fragments for the finer-grained material are smaller than the coarser-grained specimens as a result of enhanced comminution of fractured surfaces and increased intergranular fracture. Length scales > 6 mm contain > 80 % of the total mass and kinetic energy. Median ejection velocities increase for increasing impact energy (range from 5 m/s to 10 m/s for both materials). These are low in comparison to incoming projectile velocity (250 m/s to 500 m/s) and indicate that the bulk of incoming energy is dissipated into forms other than kinetic energy transfer (e.g., heat and comminution). Approximately 25 % of the mass and 80 % of the kinetic energy is contained in velocities > 20 m/s. The total conversion of impact energy to ejecta kinetic energy is estimated as approximately 3 % for the coarser material and 4 % for the finer grained material. The % conversion to momentum is higher, increasing from 7 % to 11 % for the coarser grained material and 21 % to 30 % for the finer grained material. This highlights the importance of momentum transfer during impact testing at low speeds into blocks.
Date created
2013
DOI
doi:10.7939/R3RB6WG2D
License information
© 2013 Hogan, J., Spray, J., Rogers, R., Vincent, G., & Schneider, M. This version of this article is open access and can be downloaded and shared. The original author(s) and source must be cited.
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Citation for previous publication
Hogan, James, Vincent, Gregory, Rogers, Robert, Spray, John, & Schneider, Markus. (2013). Debris Field Kinetics during the Dynamic Fragmentation of Polyphase Natural Ceramic Blocks: Ejecta Measurements and Damage Modes. Experimental Mechanics, 54(2), 211-228.  http://dx.doi.org/0.1007/s11340-013-9777-7

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File title: Debris Field Kinetics During the Dynamic Fragmentation of Polyphase Natural Ceramic_Hogan et al. 2013
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