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- W4387510147 abstract "To investigate the rate dependence on the mechanical behaviours of rocks under intermediate strain rate, three types of rock were loaded by using a newly developed servo-controlled dynamic triaxial apparatus. In this study, the dynamic strength and crack damage thresholds of rocks under different confinements were investigated at the strain rate range of 10−3∼100s−1, which is of significance to understand the rock damage subjected to earthquakes or far-field blasts. The results indicate that the apparatus could ensure the rock samples being loaded under a stable strain rate without causing prominent disturbance on the confining stress. In addition, the strength and damage thresholds are dependent on the strain rate, i.e., the increasing strain rate would result in the increase of dynamic strength and crack damage thresholds. The increase of confinement leads to a higher failure strength, the crack initiation and damage stresses are also positively correlated to the confining pressure under dynamic loads. Based on the theory of fracture mechanics that considers the crack growth velocity, it is found that the dynamic stress intensity factor exhibits a negative correlation with both the strain rate and confining pressure, whilst the fracture toughness presents an inverse trend. Therefore, the larger axial stress is required to initiate the cracks, which might further induce the variation of crack initiation stress." @default.
- W4387510147 created "2023-10-11" @default.
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- W4387510147 date "2023-11-01" @default.
- W4387510147 modified "2023-10-12" @default.
- W4387510147 title "Rate-dependent strength and crack damage thresholds of rocks at intermediate strain rate" @default.
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- W4387510147 doi "https://doi.org/10.1016/j.ijrmms.2023.105590" @default.
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