Abstract
The response of an f.c.c. lattice with Lennard-Jones interaction under symmetric lattice extension has been studied by Monte Carlo simulation at several temperatures. The critical strain at which the crystal undergoes a structural change is found to be well predicted by the mechanical stability limit expressed in terms of either the elastic constants or the bulk modulus. At low temperature (reduced temperature T=0.125), lattice decohesion is observed in the form of cleavage fracture, whereas at higher temperature ( T= 0.3) the strained system deforms by cavitation with some degree of local plasticity. At still higher temperature ( T=0.5) the lattice undergoes homogeneous disordering with all the attendant characteristics of melting.
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