Learning Forum

[Yaseen Sh]

Hello

In Ansys APDL. I have a plane 183 element with dimensions 100x50 m. Subjected to a harmonic displacement at three different edges (the left, right and the bottom). Theses edges are constrained in the vertical direction.
The analysis type: Transient, with steps 0.02 
Using a linear material, I have got a cyclic response (for point A for example). However when I use a nonlinear model (TB,BISO) the analysis stops (I have tried different models and I got the same). and I can not get any plastic strain as well
I want to show the hysteretic loop for this problem.
My questions:
1.    Why the analysis stops when using the nonlinear material? and the strian is just elsastic?
2.    How can I plot the hysteretic loops?

Thanks

 

[Bill Bulat]

If you are running MAPDL interactively, what message(s) do you see in the  output window? The MAPDL output window looks like this:If you are instead solving the model in batch mode, the message(s) will be in the output file. Is the frequency of excitation at or near a natural frequency of this very large plate? If not (if there is no dynamic amplification) then a static analysis should suffice (there would in this case be no need to solve as a transient). Is it your intention to predict either of the two phenomena (ratcheting or shakedown) using a Chaboche material model?

 

Kind regards,

Bill

[Yaseen Sh]

Hi Bill,

Thanks for your reply. 
Generally, I want to show the nonlinear behavior of the soil under cyclic loadings.
I am using APDL. I have got this message (shown below).

How can I define a Chaboche material model in APDL?

Thanks
Yaseen