Microscopic aspects of fracture: Cohesive stress

  • Dominique P. Miannay
Part of the Mechanical Engineering Series book series (MES)


If we consider an unfaulted material with a crystalline structure, such as the simple cubic cell, which is characterised on the dimensional scale by the lattice parameter ao of the order of 0.5 mn, the possibilities of ordered and bulk deformation (Fig. 1.1), at temperatures that are low compared to the melting point, correspond to the answer to the two components of a force acting on a reticular or crystallographic plane: a stress normal to this plane and a shear stress parallel to this plane. The critical values required to ensure these motions and break the interatomic bond are called the theoretical cohesive stress (or cleavage stress) and the theoretical gliding stress (or shear stress).


Shear Stress Shear Modulus Titanium Alloy Graphic Plane Fracture Mode 
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Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • Dominique P. Miannay
    • 1
  1. 1.Départment d’Évaluation de Sûreté NucléaireInstitut de Protection et de Sûreté NucléaireFontenay aux RosesFrance

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