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    Volume 41, Issue 2 (March 2018)

    Internal Morphology of Cracking of Two 3-D Pre-Existing Cross-Embedded Flaws under Uniaxial Compression

    (Received 6 June 2017; accepted 14 August 2017)

    Published Online: 2018

    CODEN: GTJODJ

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    Abstract

    This paper studies the internal morphology of cracking of two 3-D pre-existing cross-embedded flaws in poly(methyl methacrylate) specimens under uniaxial compression. In this study, observable cracking behaviors include the crack initiation, growth, wrapping and coalescence, and the ultimate fracture of the specimen. The experimental results show six modes of crack initiation and two types of crack wrapping. The initiation of silky cracks in 3-D cracking behaviors is reported first, as well as the closed-mode wrapping of petal cracks. Substantial wrapping of petal cracks, which plays an important role in crack coalescence, appears to be the major difference between the 2-D and 3-D cracking behaviors of pre-existing flaws. Moreover, three modes of crack coalescence, which include the coalescence of petal cracks, antiwing cracks, and oblique secondary cracks, are found. Crack coalescence is predominantly created by the linkage of petal cracks, which is further classified into six categories. Note that only limited vertical growth of petal cracks is observed, and the ultimate failure of specimens is induced by the continued growth of the propagated wing crack. It was found that the ultimate fracture face of the specimens consists of continuous wing cracks and fragmented silky cracks. This paper provides the internal morphology basis for the 3-D fracture mechanism of specimens containing two 3-D pre-existing cross-embedded flaws.

    Author Information:

    Zhou, Xiao-Ping
    State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, Shapingba

    Institute of Geology and Underground Engineering, Chongqing, Shapingba

    Zhang, Jian-Zhi
    Institute of Geology and Underground Engineering, Chongqing, Shapingba

    State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, Shapingba

    Yang, Lu-Hao
    Institute of Geology and Underground Engineering, Chongqing, Shapingba

    State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, Shapingba

    Cui, Yu-Long
    Institute of Geology and Underground Engineering, Chongqing, Shapingba


    Stock #: GTJ20170189

    ISSN:0149-6115

    DOI: 10.1520/GTJ20170189

    Author
    Title Internal Morphology of Cracking of Two 3-D Pre-Existing Cross-Embedded Flaws under Uniaxial Compression
    Symposium ,
    Committee D18