Effect of displacement rate on the real area of contact and temperatures generated during frictional sliding of Tennessee sandstone |
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| Authors: | L W Teufel J M Logan |
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| Institution: | (1) Center for Tectonophysics, Texas A & M University, 77843 College Station, Texas, USA |
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| Abstract: | Summary The real area of contact has been determined, and measurements of the maximum and average surface temperatures generated during frictional sliding along precut surfaces in Tennessee sand-stone have been made, through the use of thermodyes. Triaxial tests have been made at 50 MPa confining pressure and constant displacement rates of 10–2 to 10–6 cm/sec, and displacements up to 0.4 om. At 0.2 cm of stable sliding, the maximum temperature decreases with decreasing nominal displacement rate from between 1150° to 1175°C at 10–2 cm/sec to between 75° to 115°C at 10–3 cm/sec. The average temperature of the surface is between 75 and 115°C at 10–2 cm/sec, but shows no rise from room temperature at 10–3 cm/sec. At 0.4 cm displacement, and in the stick-slip mode, as the nominal displacement rate decreases from 10–3 to 10–6 cm/sec, the maximum temperature decreases from between 1120° to 1150°C to between 1040° to 1065°C. The average surface temperature is 115° to 135°C at displacement rates from 2.6×10–3 to 10–4 cm/sec.With a decrease in the displacement rate from 10–2 to 10–6 cm/sec, the real area of contact increases from about 5 to 14 percent of the apparent area; the avergge area of asperity contact increases from 2.5 to 7.5×10–4 cm2. Although fracture is the dominate mechanism during stick-up thermal softening and creep may also contribute to the unstable sliding process. |
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| Keywords: | Frictional sliding Stick-up Temperature measurements |
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