DTIC AD0774894: Fragmentation Analysis Fundamental Processes pdf

DTIC AD0774894: Fragmentation Analysis Fundamental Processes

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To investigate the effect of energy on rock fragmentation, initial testing was carried out using a drop test device. A total of 180 specimens of Wausau quartzite and anorthosite of 3.0 to 3.5 inch size were fragmented in this device. An analysis of the fragment distribution results of the drop tests showed that the energy applied was approximately inversely proportional to the mean fragment size. However, these results were not totally conclusive because of the limited energy available and the narrow band of drop heights available. A total of 270 irregular 3.0 to 3.5 inch specimens and 150 disc-shaped specimens of Wausau quartzite, anorthosite, and Felch marble were then fragmented with the impact pendulum device. Computer programs were written to analyze sieve data and to provide energy calculations. Results indicated that a power law could be obtained that provided the inverse relation between specific crushing energy and mean fragment size

• Creator/s: Defense Technical Information Center
• Date: 12/31/1973
• Year: 1973
• Book Topics/Themes: DTIC Archive, Sundae, L S, BUREAU OF MINES TWIN CITIES MN TWIN CITIES MINING RESEARCH CENTER, *FRAGMENTATION, *ROCK MECHANICS, MECHANICAL ENERGY, PARTICLE SIZE, TEST METHODS

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