Novel near-cloaking multicoated structures for screw dislocations

We study the interaction of a screw dislocation with a multicoated circular inclusion. For given geometric parameters of an N-phase circular inclusion, in which a circular inclusion is bonded to the surrounding matrix through N−2 coaxial coatings, we can properly design the N−1 mismatch parameters of the composite so that there exist N−2 equilibrium positions for the screw dislocation. The designed multicoated inclusion can be considered as a near-cloaking structure for the screw dislocation at these equilibrium positions.

► Designed near-cloaking multicoated structures for screw dislocations.
► Found N−2 equilibrium positions for the dislocation with an N-phase inclusion.
► Made the inclusion “invisible” to the dislocation at the equilibrium positions.