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Volume 35 Issue 1
Jan 2021
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Chinese Journal of High Pressure Physics  > 2021  >  35(1): 014101.
LU Zhenyu, LI Wenbin, YAO Wenjin, PENG Hang. Experimental Study on Compression and Fracture Characteristics of Two Kinds of Rocks under Different Strain Rates[J]. Chinese Journal of High Pressure Physics, 2021, 35(1): 014101. doi: 10.11858/gywlxb.20200605
Citation: LU Zhenyu, LI Wenbin, YAO Wenjin, PENG Hang. Experimental Study on Compression and Fracture Characteristics of Two Kinds of Rocks under Different Strain Rates[J]. Chinese Journal of High Pressure Physics, 2021, 35(1): 014101. doi: 10.11858/gywlxb.20200605
shu

Experimental Study on Compression and Fracture Characteristics of Two Kinds of Rocks under Different Strain Rates

doi: 10.11858/gywlxb.20200605

  • School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210018, Jiangsu, China

  • Received Date: 20 Aug 2020
  • Rev Recd Date: 02 Sep 2020
    Abstract
  • To better understand crack generation laws and failure modes of various rocks compressed under different strain rates, specimens made from limestone and red sandstone were respectively prepared and their crack formation under different strain rates and stress modes was investigated in both quasi-static and dynamic compression tests. High-speed photography was used to record cracks occurrence as well as failure modes. By analyzing the rocks’ physical properties, stress state, and energy evolution in comparison, reasons for the crack morphology variation in compression under different strain rates were obtained. It is shown that: (1) the failure modes of rock specimens under compression in the quasi-static range vary with strain rates, and the compressive strength of rock specimens are significantly effected by different failure modes; (2) the magnitude of incident energy determines the fluctuation of the dynamic compressive strength curve of the rock sample; (3) under dynamic compression, the circumferential growth rate of crack is positively correlated with the compressive strength of rock.

     

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