Output from DLOAD subroutine

[Bruno V]

Hello everyone,

I am trying to perform a multi-step static analysis on shell elements by means of the subroutine DLOAD.

I extracted the stress history at a specific location (see attached illustration).
I do not understand the shape of the signal. When I look at the results, I can see that several values are reported at each time step, hence the unrealistic spikes one can see on the attached figure.

How can I solve this? I tried different in the solver under Steps but nothing works so far.

Thanking you in advance

Regards,

 

[FEA way]

Hard to say without knowing more about your analysis. How did you obtain this output ? What are the settings in the related output request ?

 

[Bruno V]

Hi,

The field output is defined as "from time points" where the timepoints are defined separately

The output is obtained at a specific node. I see the same trend for other variables such as displacement

 

[FEA way]

So you used the XY Data from ODB Field Output option to create that plot ? Why not request history output for that node instead (and set the frequency to 1 for more accuracy) ?

 

[Bruno V]

thank you for your reply

I need to export the results for an entire field of nodes. I typically export the results in a .rpt file.

It appears that at a given time step, several values are given, thus creating non continuous output signals.

I have to refine the meshing to capture as accurately as possible the moving load I try to simulate. It seems to help without solving the issue. The shell elements are of type S4.

Is there anything else I can do to guarantee a continous output ?

 

[Bruno V]

Hi,

I believe I have solved my problem by further refining the mesh and ensuring compatibility between the different shell elements (I use the submodelling capacities of Abaqus)