Effect of strain rates from 10⁻² to 10 S⁻¹ in triaxial compression tests on three rocks
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Date
1976
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Abstract
Room-temperature, compression tests at strain rates from 10⁻² to 10 s⁻¹ are run on Charcoal Granodiorite to 0.45 GPa confining pressure and on Berea Sandstone and Indiana Limestone to 0.25 GPa confining pressure. For each rock ateach confining pressure, the differential stress at failure is relatively constant up to a strain rate of 1 s⁻¹ and apparently increases abruptly above this strain rate. Dynamic analysis of the testing apparatus indicates that the apparent sudden increase in strength is due to machine inertia and does not reflect a real increase in the strength of the rocks. Similar increases, beginning between 10⁻¹ and 10³ s⁻¹, are reported in previous studies. It is possible that these increases are also due to inertial effects. Taking inertia into account, the actual failure stresses of the three rocks are relatively independent of strain rate between 10⁻² and 10 s⁻¹. In the same interval, the strains at which the rocks begin to fragment tends to be lower at higher strain rates. The combination of decreasing strains and relatively constant stresses with increasing strain rate suggests that the energy necessary to fragment the rocks is lower at higher strain rates.
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Rocks, Cleavage, Rocks, Testing, Major geology