STP431

    3-5 Mineral Cleavage and Cohesive Strength of Single Crystals

    Published: May 1967


      Format Pages Price  
    PDF Version (28K) 1 $25   ADD TO CART
    Complete Source PDF (592K) 1 $55   ADD TO CART


    Abstract

    The relationship of fracture stress to Young's modulus, surface energy and atomic separation that has been used successfully for NaCl, diamond and glasses is applied to the interpretation of cleavage and parting in silicate single crystals. If modulus of rigidity is substituted for Young's modulus in the fracture stress equation, improved correlations between cleavage directions and directions of low or minimum values for the rigidity modulus result. If the elastic moduli and the atomic separations are known for a crystal, the relative surface energies for the different crystallographic directions may be estimated from the cleavage relations. A Griffith crack mechanism for cleavage should yield the same cleavage directions but at lower stresses.


    Author Information:

    DeVore, George W.
    Florida State University,


    Paper ID: STP45167S

    Committee/Subcommittee: C24.30

    DOI: 10.1520/STP45167S


    CrossRef ASTM International is a member of CrossRef.