1: A stationary screw dislocation
in cartesian (x, y, z) and cylindrical polar (r, [theta], z) coordinates.
(ii) Screw dislocation
b//OZ: only the tangential component is nonzero:
The underpinning results of Li and Liu  on the physical property tensors enabled Wang and Pan  to give detailed closed-form representations of the field components of a screw dislocation
moving uniformly in one-dimensional hexagonal piezoelectric quasicrystals.
In order to gain a clear idea of the most important factor which influences the dislocation preferential formation site of mixed dislocation at the plane perpendicular to the QD growth direction in InAs quantum dots, we decompose the 60[degrees] mixed dislocation into two edge dislocation components with Burgers vector  and [00 - 1], respectively, and a screw dislocation
component with Burgers vector [-110].
Suppose that a piezoelectric material is transversely isotropic and containing a charged screw dislocation
around a finite crack of length 2a as shown in Fig.
A prime example is the presence of a screw dislocation
in a crystal (Fig.
In older walls, well proximal of growing edges, large areas of the wall surface may be covered by crystallites that have undergone multiple divisions by screw dislocation
, or by step-like splitting.
investigated Peierls stress of a screw dislocation
below a free surface via a self-consistent semidiscrete variational P-N model using image dislocation method .
There are two types of dislocations: an edge dislocation for which [b.sup.[mu]][[xi].sup.[mu]] = 0 and a screw dislocation
which can be right-handed for which [b.sup.[mu]][[xi].sup.[mu]] = b, or left-handed for which [b.sup.[mu]][[xi].sup.[mu]] = -b, where b is the magnitude of the Burgers vector.
If we consider a stationary screw dislocation
in the spacetime continuum, with cylindrical polar coordinates (r, [theta], z), with the dislocation line along the z-axis (see Fig.
Wei  investigated the impingement of a screw dislocation
on intrinsic stacking fault (SF) and extrinsic stacking faults (ESF) in different FCC metals by using the molecular dynamics simulations, which were significant to further understand the details of plastic deformation and to seek the underlying techniques for strengthening metals; Dey et al.
A screw dislocation
can cut another screw dislocation
and generate a close-packed line of vacancies and interstitials similar to it glides with the point defect produced depending on the relative Burgers vectors of the intersecting dislocations Because strain energy related to vacancy is smaller than with related to interstitial atom the vacancies are formed in larger number than interstitial atoms.