Effect of displacement rate on the real area of contact and temperatures generated during frictional sliding of Tennessee sandstone
Effect of displacement rate on the real area of contact and temperatures generated during frictional sliding of Tennessee sandstone
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DOI：
10.1007/bf00876541
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发表时间：
1978-07
影响因子：
2
通讯作者：
L. Teufel;John M. Logan
中科院分区：
文献类型：
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作者：
L. Teufel;John M. Logan
真实的接触面积已被确定，并测量的最大和平均表面温度产生的摩擦滑动沿着预切表面在田纳西州砂岩已作出，通过使用thermodyes。在50 MPa围压和10− 2 ~ 10− 6 cm/sec的恒定位移速率下进行了三轴试验，位移最大可达0.4 om。在0.2 cm的稳定滑动下，最高温度随着标称位移速率的降低而降低，从10− 2 cm/sec时的1150° ~ 1175° C降低到10− 3 cm/sec时的75° ~ 115°C。在10− 2厘米/秒的速度下，表面的平均温度在75 °C到115°C之间，但在10− 3厘米/秒的速度下，表面的平均温度没有从室温上升。在0.4 cm位移和粘滑模式下，随着标称位移速率从10− 3降低到10− 6 cm/sec，最高温度从1120°C到1150°C降低到1040°C到1065°C。当位移速率从2.6×10− 3 cm/sec降至10− 4 cm/sec时，平均表面温度为115°C至135°C。当位移速率从10− 2 cm/sec降至10− 6 cm/sec时，接触的真实的面积从表观面积的5%增至14%;粗糙接触的平均面积从2.5 ×10− 4 cm 2增至7.5×10− 4 cm 2。虽然断裂是粘着过程中的主要机制，但热软化和蠕变也可能导致不稳定的滑动过程。
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 10−2to 10−6cm/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 10−2cm/sec to between 75° to 115°C at 10−3cm/sec. The average temperature of the surface is between 75 and 115°C at 10−2cm/sec, but shows no rise from room temperature at 10−3cm/sec. At 0.4 cm displacement, and in the stick-slip mode, as the nominal displacement rate decreases from 10−3to 10−6cm/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 2.6×10−3to 10−4cm/sec.With a decrease in the displacement rate from 10−2to 10−6cm/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 7.5×10−4cm2. Although fracture is the dominate mechanism during stick-up thermal softening and creep may also contribute to the unstable sliding process.