Volterra dislocation

[vol′ter·ə ‚dis·lō′kā·shən]

(solid-state physics)

A model of a dislocation which is formed in a ring of crystalline material by cutting the ring, moving the cut surfaces over each other, and then rejoining them.

References in periodicals archive ?

Around the axis O[x'.sub.3], when T increases and the core size e decreases, the elastic field tends gradually to that of a classical Volterra dislocation. Along the axes O[x.sub.1] and O[x.sub.2], the periodicity of the defects is T and T/cos [theta].

Threading Dislocations Piercing the Free Surface of an Anisotropic Hexagonal Crystal: Review of Theoretical Approaches

A two-parameter criterion of plasticity, the Coulomb Criterion [[Sigma].sub.c] = S - m[[Sigma].sub.n], is then found as the critical stress needed to propagate Somigliana loops, in the same way as the yield threshold is found in crystal plasticity as the stress to move Volterra dislocation loops.

as is observed for Volterra dislocations in crystalline solids.

A physical model of the pressure dependence and biaxial mechanical properties of solid polymers