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Logarithmic screw dislocation

100%

Wesołowski Z.

Engineering Transactions

2004

tom Vol. 52, iss.4

297-300

Basing on linear elasticity, the displacement field uz=B[theta]lnr (in cylindrical coordinates r, [theta], z) was derived. This displacement has a jump on the half-plane [theta]=0. Stresses orthogonal to this discontinuity plane are continuous.

AFM studies of pits formation on KBr(1 0 0) during its dissolution by water

88%

Pers J. , Barwiński B. , Grodzicki M. , Ciszewski A.

Materials Science Poland

2016

tom Vol. 34, No. 4

863--867

The formation of etch pits along screw dislocations on KBr(1 0 0) surface during its dissolution by water is investigated by means of atomic force microscopy (AFM). Clean KBr(1 0 0) is obtained by cleavage. A weak solution of water in isopropyl alcohol is used to investigate the etching in real time. Observations of the etch pit evolution with etching time show that concentration of atomic steps on the pit walls and dissolution rate of the walls vary up to complete dissolution of the screw dislocation. The screw dislocation removal stabilizes the dissolution, resulting in constant values of atomic steps concentration on the pit walls and their dissolution rate during further etching, which continues according to the crystal dissolution stepwave model. It was found that the movement of AFM scanning tip essentially affected the etching process.

A screw dislocation located outside, inside or on the interface of a parabolic elastic inhomogeneity

88%

Wang X. , Schiavone P.

Archives of Mechanics

2021

tom Vol. 73, nr 3

219--235

Using conformal mapping techniques, superposition and analytic continuation, we derive analytic solutions to the problem of a screw dislocation interacting with a parabolic elastic inhomogeneity. The screw dislocation can be located anywhere either in the surrounding matrix or in the parabolic inhomogeneity or simply on the parabolic interface itself. We obtain explicit expressions for the two analytic functions in the image plane characterizing the elastic fields describing displacement and stresses in the two-phase composite. Using the Peach-Koehler formula, we also obtain the image force acting on the screw dislocation. The analytic function defined in the parabolic inhomogeneity in the physical plane can be interpreted in terms of real and image screw dislocations for any location of the real screw dislocation.