Micro-scale energy dissipation mechanisms during dynamic fracture in natural polyphase ceramic blocks |
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| Authors: | James D Hogan John G Spray Robert J Rogers Suporn Boonsue Gregory Vincent Markus Schneider |
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| Affiliation: | aDepartment of Mechanical Engineering, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada;bPlanetary and Space Science Centre, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada;cFrench-German Research Institute of Saint-Louis, 5 rue du Général Cassagnou, 68300 Saint-Louis, France |
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| Abstract: | The dynamic fracture of natural polyphase ceramic (granite) blocks by high-speed impact at 207 m/s, 420 m/s and 537 m/s has been investigated. An electromagnetic railgun was used as the launch system. Results reveal that the number of fragments increases substantially, and the dominant length scale in their probability distributions decreases, as the impact energy is increased. Micro-scale studies of the fracture surfaces reveals evidence of localized temperatures in excess of 2000 K brought on by frictional melting via fracturing and slip along grain boundaries in orthoclase and plagioclase, and via transgranular fracture (micro-cracking) in quartz. The formation of SiO2- and TiO2-rich spheroids on fracture surfaces indicates that temperatures in excess of 3500 K are reached during fracture. |
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| Keywords: | Dynamic brittle fragmentation Railgun impact experiment Thermal effects in cracking Micro-scale energy dissipation Elastic heat dissipation in fracture |
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