pre-defined twinSystem, similar to the existing pre-defined slipSystem

[GolamRashed]

The calculation of Resolved Shear Stress for TWIN is different than dislocation Glide or slip (MTEX has addressed this with the class slipSystem), since slip planes and directions are different for Twin systems.

It would be of great help if we could use an additional/new class named twinSystem to claculate RSS for TWIN, and compare with RSS from slipSystem or CRSS of the crystal itself.

List of slip and twin systems for FCC/BCC/HCP crystals - https://damask.mpie.de/Documentation/CrystalLattice

[kilir]

Hi, the way e.g. Schmid factors are calcualted for twinning and for slip should be exactly the same. Both, twinning systems and slip systems are given by a plane normal and a slip direction. Could you elaborate what you do mean with "The calculation of Resolved Shear Stress for TWIN is different than dislocation Glide"?

Or do you simply want pre-defined twin systems, in analogy to those pre-defined slip systems available?

You can always define those by your own as well. The only thing is that the they'd still be of class slipSystem - but is that really an issue - because everythign else would be redundant with slipSystem.

Cheers, Rüdiger

[GolamRashed]

Hi,

the way e.g. Schmid factors are calcualted for twinning and for slip should be exactly the same. Both, twinning systems and slip systems are given by a plane normal and a slip direction.

Yes of course, for twin it is related to: the angle between stress and twin plane, and the angle between stress and twin direction.

do you simply want pre-defined twin systems, in analogy to those pre-defined slip systems available?

Yes, exactly that, this would be a lifesaver. :)

Maybe a new function named twinSystem within the existing slipSystem class would do the job.