Learning Forum

[Ahmed_Fageeri]

Hello everyone,

I am working on a steel damper, I defined the plasticity as Bilinear Isotropic Hardening and performed three analyses, Static Structural with 1mm remote displacement to get the buckled shape, Eigenvalue Buckling to get the mode shapes and export the desired mode shape to another Static Structural to apply the cyclic loading. I came out with the below chart (function of the reaction force and the deformation probe). What comments you have and how I can make the graph more symmetric in tension and compression.

Thanks,

[1shan]

You could try smoothing the mesh in the model especially in critical areas and also increase the load steps ( try with initial sub-steps steps 50, minimum 25, maximum 500). Also, is the mode shape deformation symmetric in compression and tension? If not you might get a asymmetric response.
Regards Ishan.

[BenjaminStarling]

As you are loading the structure in two different directions (loading-unloading-loading) you should be using kinematic hardening, instead of isotropic hardening.

[Ahmed_Fageeri]

I tried to increase the load steps, but the software reaches somepoint and abort the analysis and the results are not fully available, how can I solve this issue?

[1shan]

What error does it throw after stopping? Did you try improving the mesh?
Regards

[Ahmed_Fageeri]

I tried to reduce the mesh from 10mm to 5mm but it gave an error also It says the probe is unable to converge and the same for the force reaction