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Surface roughness of alumina fragments caused by hypervelocity impact |
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| Authors: | T. Kadono J. Kameda H. Tanaka A. Fujiwara |
| Affiliation: | a Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Showa 3173-25, Kanazawa, Yokohama, Kanagawa 236-0001, Japan b Department of Earth and Planetary Science, University of Tokyo Hongo 7-5-1, Bunkyo, Tokyo113-0033, Japan c Department of Complexity Science and Technology, University of Tokyo, Kashiwanoha 5-1-5, Kashiwa, Chiba 277-8561, Japan d Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Yoshinodai 3-1-1, Sagamihara, Kanagawa 227-1133, Japan |
| Abstract: | Hypervelocity impact experiments are carried out with alumina ceramic targets at impact velocities of 2-4 km/s. The fractal dimension (or roughness exponent) of fragment surfaces is estimated by two different methods (different length scales). One is a divider method (large scale) and the other is a gas-absorption one (small scale). The obtained fractal dimensions are different: ∼2.2-2.4 for larger scale and ∼2.5-2.7 for smaller scale. These values are regardless of the degree of fragmentation. |
| Keywords: | Hypervelocity impact Fragmentation Surface area Fractal dimension |
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