Evaluating the Cleavage Energy of Brittle Single Crystals

    (Received 15 October 2013; accepted 13 January 2014)

    Published Online: 2014

    CODEN: MPCOAD

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    Abstract

    Evaluating the cleavage energy of brittle crystals is challenging due to the need to generate a controlled deformation of only a few microns; to introduce a straight and planar, atomistic thick precrack, perfectly aligned with the plane of propagation; to align the external loading with that plane; and above all, to grip the specimen while avoiding premature cleavage. In addition, achieving a relatively slow crack upon initiation is another requirement that needs special treatment. Consequently, we designed an experimental method that fulfills the above requirements. It consists in gluing a thin, rectangular specimen, with an atomistic sharp precrack, inside a rectangular hole in an aluminum loading frame, using thin layers of epoxy resin. Crack initiation and propagation occur upon heating the assembly on top of an electrical heating stage by only a few °C, due to the coefficients of thermal expansion mismatch between the specimen and the aluminum frame. Finite element analysis is used to evaluate the strain energy release rate. We describe it in full through cleavage experiments of two low energy cleavage systems of silicon crystal under pure Mode I, under room conditions and argon gas at atmospheric pressure.


    Author Information:

    Sherman, Dov
    Department of Materials Science and Engineering, Technion—Israel Institute of Technology, Haifa,

    Gleizer, Anna
    Department of Materials Science and Engineering, Technion—Israel Institute of Technology, Haifa,


    Stock #: MPC20130076

    ISSN: 2165-3992

    DOI: 10.1520/MPC20130076

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    Author
    Title Evaluating the Cleavage Energy of Brittle Single Crystals
    Symposium , 0000-00-00
    Committee E08