Journal
MECHANICS OF MATERIALS
Volume 82, Issue -, Pages 28-38Publisher
ELSEVIER
DOI: 10.1016/j.mechmat.2014.12.006
Keywords
Rock mechanics; High temperature; Strain rate; Rock material; Impact load; Dynamic mechanical properties
Categories
Funding
- National Natural Science Foundation of China [51378497]
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Strain rate is not only an important measure to characterize the deformation property, but also an important parameter to analyze the dynamic mechanical properties of rock materials. In this paper, by using the SHPB test system improved with high temperature device, the dynamic compressive tests of sandstone at seven temperatures in the range of room temperature to 1000 degrees C and five impact velocities in the range of 11.0-15.0 m/s were conducted. Investigations were carried out on the influences of strain rate on dynamic compressive mechanical behaviors of sandstone. The results of the study indicate that the enhancement effects of strain rates on dynamic compressive strength, peak strain, energy absorption ratio of sandstone under high temperatures still exist. However, the increase ratios of dynamic compressive strength, peak strain, and energy absorption ratio of rock under high temperature compared to room temperature have no obvious strain rate effects. The temperatures at which the strain rates affect dynamic compressive strength and peak strain most, are 800, and 1000 degrees C, respectively. The temperatures at which the strain rates affect dynamic compressive strength and peak strain weakest, are 1000 degrees C, and room temperature, respectively. At 200 and 800 degrees C, the strain rate effect on energy absorption ratio are most significant, while at 1000 degrees C, it is weakest. There are no obvious strain rate effects on elastic modulus and increase ratio of elastic modulus under high temperatures. According to test results, the relationship formula of strain rate with high temperature and impact load was derived by internalizing fitting parameters. Compared with the strain rate effect at room temperature condition, essential differences have occurred in the strain rate effect of rock material under the influence of high temperature. (C) 2014 Elsevier Ltd. All rights reserved.
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