Abstract
In order to quantitatively investigate the energy dissipation characteristic during the dynamic tension failure of rock materials, the dynamic Brazilian disc tests on red sandstone were conducted using the split Hopkinson pressure bar (SHPB) setup. The states of the specimens after different incident energies can be divided into three forms (i.e., the unruptured state, the ruptured state, and the broken state), and the failure processes of the specimens were recorded by using a high-speed camera. The results show that the ruptured state of the specimen corresponds to the critical failure strain. Taking the critical incident energy as a turning point, two positive linear fitting relations between the dissipated energy and incident energy before and after the point are obtained, and the dynamic linear dissipation law is found. When the incident energy is less than the critical energy, specimens were unruptured after impact. When the incident energy is greater than the critical energy, specimens will be broken after impact. According to the obtained linear energy dissipation law, the dynamic tensile energy dissipation coefficient (DTEDC) was introduced for quantitatively describing the dynamic energy dissipation capacity of rock materials in the dynamic Brazilian disc test. When the specimen is in the unruptured state, the ideal DTEDC is a constant value. When the specimen is in a broken state, the DTEDC increases with the increase of incident energy.
Highlights
In order to quantitatively investigate the energy dissipation characteristic during the dynamic tension failure of rock materials, the dynamic Brazilian disc tests on red sandstone were conducted using the split Hopkinson pressure bar (SHPB) setup. e states of the specimens after different incident energies can be divided into three forms, and the failure processes of the specimens were recorded by using a high-speed camera. e results show that the ruptured state of the specimen corresponds to the critical failure strain
When the incident energy was less than the critical incident energy, the specimens were in the unruptured state after impact, and when the incident energy was greater than the critical incident energy, the specimens were in the broken state after impact
A series of dynamic Brazilian disc tests of red sandstone specimens were carried out using the SHPB setup
Summary
In order to quantitatively investigate the energy dissipation characteristic during the dynamic tension failure of rock materials, the dynamic Brazilian disc tests on red sandstone were conducted using the split Hopkinson pressure bar (SHPB) setup. e states of the specimens after different incident energies can be divided into three forms (i.e., the unruptured state, the ruptured state, and the broken state), and the failure processes of the specimens were recorded by using a high-speed camera. e results show that the ruptured state of the specimen corresponds to the critical failure strain. In order to quantitatively investigate the energy dissipation characteristic during the dynamic tension failure of rock materials, the dynamic Brazilian disc tests on red sandstone were conducted using the split Hopkinson pressure bar (SHPB) setup. E states of the specimens after different incident energies can be divided into three forms (i.e., the unruptured state, the ruptured state, and the broken state), and the failure processes of the specimens were recorded by using a high-speed camera. Rock materials are often subjected to dynamic loads, such as impact, blasting, and vibration, and the Split Hopkinson pressure bar (SHPB) has become a common device used for studying the dynamic failure of rocks under high loading rates or strain rate. The dynamic Brazilian disc tests of red sandstone under different incident energies were carried out, and the failure processes of rock specimens were recorded with a high-speed camera. According to the experimental results, the failure modes and energy relationships under different incident energies were analyzed
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