Explore: Crystal Dislocations

sessile dislocations which are immobile and glissile dislocations which are mobile. Examples of sessile dislocations are the stair-rod dislocation and the

Geometrically necessary dislocations are like-signed dislocations needed to accommodate for plastic bending in a crystalline material. They are present

best known for his work on crystal dislocations, including (with Thornton Read) the idea of the Frank–Read source of dislocations. He also proposed the cyclol

by Yakov Frenkel and Tatyana Kontorova (1939) in their study of crystal dislocations known as the Frenkel–Kontorova model. This equation attracted a lot

the edge dislocation and the screw dislocation. "Mixed" dislocations, combining aspects of both types, are also common. Edge dislocations are caused

extra atom squeezed in where it does not fit), and dislocations (see figure at right). Dislocations are especially important in materials science, because

Dislocation creep is a deformation mechanism in crystalline materials. Dislocation creep involves the movement of dislocations through the crystal lattice

in the late 1960s. Dislocations in a crystal lattice are line defects that are associated with local stress fields. Dislocations allow shear at lower

partial dislocations. The vector sum of the Burgers vectors of the partial dislocations is the Burgers vector of the extended dislocation. A dislocation will

crack-tip and dislocations. This stress concentration can be characterised using a path-independent line integral, as shown by Eshelby for dislocations considering