What do you mean by strain controlled? If I understand it right, do you mean that the length of the specimen is constant while the stress varies?

If this is the case, then you can apply the displacement boundary condition to make the length controlled.

You can use ANSYS workbench to do co-simulations with mechanical/thermal/electrical faults etc. No clue about fatigue tests. 

Dear Zhou,

Strain controlled means,  I need to perform Low Cycle fatigue simulations in workbench. Please help me in the same.

Thank You,

Your question sounds ill-posed. For example, which kind of result do you want to obtain? Which specimen geometry? Too many variables in the answer depend on your goal...

Dear Benasciutti,

The geometry is as per ASTM E606 Low cycle fatigue sample. I want to compute low cycle fatigue life. if any other else required please revert here. and please help me in solving the same.

Thank You,

If you aim at simulating the material the elasto-plastic response under imposed strain, you need at least a mixed kinematic+isotropic model (for example, Chaboche + Voce). However, material parameters to input in the FEM must be calibrated from experimental cyclic data (or, if you are very lucky, you can find them in the published literature).

If you aim at estimating the fatigue life (i.e. the strain-life Manson-Coffin equation), the best approach is always to perform experimental fatigue tests. Otherwise, a simplified approach is to estimate the strain-life equation from tensile strength data (e.g. Universal Slopes Equation). In this case, I think that FEM simulation is not necessary.

If you still want to use simulation, perhaps you can try a “damage model, which however (I guess) is not readily available in commercial software” (unfortunately, I’m not an expert on this topic).

In conclusion, without any clear idea of your goal, your question “I want to perform strain controlled fatigue test in FEM” still sounds obscure to me.

you can use ansys ncode designlife software for performing fatigue