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    Volume 50, Issue 1 (July 2021)

    Experimental Study on Dynamic Mechanical Properties and Fracturing Behavior of Granite CSTFBD Specimens in SHPB Tests

    (Received 19 February 2021; accepted 13 April 2021)

    Published Online: 19 July 2021

    CODEN: JTEVAB

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    Abstract

    The purpose of this paper is to study the dynamic fracture mechanics characteristics and fracturing behavior of cracked-straight-through flattened Brazilian disk specimens using the Split Hopkinson Pressure bar system. The researchers also used Particle Flow Code 2D for simulating the crack process and achieved consistent outcomes. In this experiment, rock specimens were made from Beijing Fangshan granite. The results of the experiment determined the effects of impact pressures and loading angles on the crack mode and mechanical properties of the specimens. These specimens have attained the stress equilibrium state prior to failure. With greater impact pressure, there will be faster changes in the corresponding equivalent tensile stress, while the peak value remains relatively high under the same loading angle. With different loading angles, the change rate of the equivalent tensile stress remains the same; however, the time required to reach the maximum stress becomes different. For a 30° loading angle, the energy dissipation ratio in accordance with the same impact pressure is lower than compared to that of a 0° loading angle. In this experiment, several cracks have been produced under a different range of impact pressures and loading angles, which can be classified into six types. They include two types of tensile cracks, shear cracks, and tensile-shear cracks. At a 0° loading angle, mode I fracture occurs, and at 15° and 30° loading angles, a mixed-mode I-II fracture occurs on the specimen. Furthermore, triangular fracture zones occur on the two end faces of the specimens under the loading force due to the concentration of local stress during the force process.

    Author Information:

    Peng, Linzhi
    School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing), Haidian District, Beijing

    Yue, Zhongwen
    School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing), Haidian District, Beijing

    Wang, Xu
    School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing), Haidian District, Beijing

    Zhou, Jun
    School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing), Haidian District, Beijing

    Yue, Xiaolei
    School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing), Haidian District, Beijing

    Xu, Shengnan
    School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing), Haidian District, Beijing

    Qiu, Peng
    School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing), Haidian District, Beijing

    State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Haidian District, Beijing


    Stock #: JTE20210116

    ISSN:0090-3973

    DOI: 10.1520/JTE20210116

    Author
    Title Experimental Study on Dynamic Mechanical Properties and Fracturing Behavior of Granite CSTFBD Specimens in SHPB Tests
    Symposium ,
    Committee C16