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• W2954025355 abstract "To investigate the fracture characterizations of rocks under high strain rate tensile failure, a series of dynamic Brazilian tests was conducted using Split Hopkinson pressure bar (SHPB), and a high-speed digital camera at a frame rate of 50,000 frames per second (FPS) with a resolution of 272 <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M1><mml:mo>×</mml:mo></mml:math> 512 pixels was adopted to capture the real-time images and visualize the failure processes. Using the extracted cracks and image processing technique, the relationship between loading condition (impact velocity), crack propagation process (crack velocity, crack fractal characteristic, and crack morphological features), and dynamic mechanical properties (absorbed energy and strain-stress parameters) was explored and analyzed. The experimental results indicate that (1) impact velocity plays a critical role in both crack propagation process and dynamic mechanical properties, (2) the crack fractal dimension is positively correlated with crack propagation velocity and has a linear relationship with the proposed morphological feature of crack, (3) mean strain rate and max strain of rocks under SHPB loading both decrease with the increase of crack propagation velocity, and (4) the energy absorbed by the rocks increases with increasing impact velocity and has a strong negative correlation with a proposed novel crack descriptor. Experimental studies pertaining to the measurement of crack propagation path and velocity, in particular, some crack feature extraction approaches, present a promising way to reveal the fracture process and failure mechanisms of rock-like materials." @default.
• W2954025355 created "2019-07-12" @default.
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• W2954025355 date "2019-07-01" @default.
• W2954025355 modified "2023-10-18" @default.
• W2954025355 title "Experimental Study of Fracture Characterizations of Rocks under Dynamic Tension Test with Image Processing" @default.
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• W2954025355 doi "https://doi.org/10.1155/2019/6352609" @default.
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