As part of a program conducted by the Bureau of Mines to reduce the explosion hazard in coal mines, a study was made of the frictional ignition source that can develop to cause the ignition of methane when a coal mining machine encounters rock strata or hard inclusions. Such impacts between metal and rock reproduced by a laboratory machine caused a number of ignitions. A model is proposed that considers the mechanisms of energy dissipation during tangential impact.
Robert Blickensderfer, Albany Metallurgy Research Center, Bureau of Mines, U.S. Department of the Interior, Albany, Oregon 97321 USA
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