Post-processing operation：Result file of extracting fepx by grain

[Ming-is]

Fepx's simulation output files are output by element or node. I can't know which grain these elements and nodes correspond to. How can I obtain the stress or strain tensor of the specific grains?

And if I want to get the lattice strain corresponding to a specific fiber orientation, what should I do？

[rquey]

Fepx's simulation output files are output by element or node. I can't know which grain these elements and nodes correspond to. How can I obtain the stress or strain tensor of the specific grains?

Just ask for it... If stress is defined for elements, you can get it for elsets (which represent grains) using -reselset stress.

And if I want to get the lattice strain corresponding to a specific fiber orientation, what should I do？

You first have to define the fiber as an entity, as in -entity "myfiber:fiber(1,0,0,1,0,0,15)". This will define the fiber as the set of elements whose orientations are within 15° of the (100)||X orientation fiber. This also automatically defines new options, such as -resmyfiber. So, you can do, for example, -resmyfiber stress to get the average stress of myfiber.

[Ming-is]

OK, thanks, and do these instructions run in the S module?

[rquey]

Yes. All mesh keys can be used in -S.

[Ming-is]

For the second question, I used this instruction-------【 neper -S 4.sim -entity "myfiber:fiber(1,0,0,1,0,0,15)" -resmyfiber stress】，
but the program reported an error：

Info : Running post-processing...
Info : - Loading inputs...
Info : > simulation.tess...
Info : > simulation.msh...
Info : > simulation.config...
Info : - Writing results...
Info : [o] Writing directory 4.sim/results/myfiber'... Error : > Entity myfiber' has no parent.

[rquey]

Update to version 4.4.2-29.

[Ming-is]

ok，thanks