Volume 35 Issue 3
Jun 2021
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ZHANG Lei, WANG Wenshuai, MIAO Chunhe, SHAN Junfang, WANG Pengfei, XU Songlin. Rough Surface Morphology of Granite Subjected to Dynamic Friction[J]. Chinese Journal of High Pressure Physics, 2021, 35(3): 031201. doi: 10.11858/gywlxb.20200640
Citation: ZHANG Lei, WANG Wenshuai, MIAO Chunhe, SHAN Junfang, WANG Pengfei, XU Songlin. Rough Surface Morphology of Granite Subjected to Dynamic Friction[J]. Chinese Journal of High Pressure Physics, 2021, 35(3): 031201. doi: 10.11858/gywlxb.20200640

Rough Surface Morphology of Granite Subjected to Dynamic Friction

doi: 10.11858/gywlxb.20200640
  • Received Date: 18 Nov 2020
  • Rev Recd Date: 16 Dec 2020
  • Dynamic friction characteristics of rock surface during impact are of great significance to investigations of seismic slip and other phenomena. Series of experiments on rock samples with inclined joint were conducted by the split Hopkinson pressure bar (SHPB) bundles device. Changes of surface roughness of granite were observed by optical microscope for large field of view (i.e., millimeter scale) and step instrument for small field of view (i.e., submillimeter scale). Under the condition of micro slip, the surface was still very rough, but there was no larger bulge; however, the local initially smooth surface became rough due to the friction effect of the surface. Thus it was difficult to observe the smooth sliding surface that appears during large displacement slip. Based on the governing equation of sliding friction and diffusion of micro surface, the description method of dynamic evolution of surface rough morphology was established by using inclined strip finite subgroup representation. The preliminary results show that this method was feasible, but it needs to be improved with more profound experimental observation. The results have a good reference significance for the understanding of the evolution process and mechanism of dynamic friction.

     

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