Learning Forum

[Gijoys4v]

while I solved a structural problem using workbench in 1step(analysis setting 1 step is given with 10 substep), I could obtain the stress at each substep. But when I solved the same problem in 2 time step(in the 1st time step I made one side of the beam fixed and the next time step a displacement is given), in the second time step I can find only the final answer, the substep I given havent seen. Please help me to resolve the problem

[Rohith Patchigolla]

Hello, 

Please share the images of your model and Displacement loading details box. 

Best regards,
Rohith

[Gijoys4v]

 

[Gijoys4v]

hope you can follow and help me

[Rohith Patchigolla]

Hi, 

Thanks. 

Please try the below. Activate the displacement at Step 1, change the value to 0 and deactivate it again. 

This is happening because of Tabular definition of Displacement, which in your case, 

t = 0, disp = 0

t = 1, disp = 5e-2

t = 2, disp = 5e-2

So, even though displacement at step 1 is deactivated, according to the table, between 1-2 s, displacement is always 5e-2. Hence it suddenly step applies this displacement and you see full stress value from the beginning. 

Another option to avoid this is to change the "Independent" variable setting in the details of the Displacement from "Time" to "Step, which will define displacement load directly by constant value for each load step, instead of table. 

Hope this helps.

Best regards,

Rohith

[Gijoys4v]

Thanks a lot, it worked..........

[Gijoys4v]

what is the difference between "ramped data" and "tabular data" when we assign the displacement data in tabular form?

[Rohith Patchigolla]

When you don't de-activate any load step in between, there is no difference. 

Only when you deactivate, the difference comes up as explained in my previous answer. 

 

[Gijoys4v]

I have a situation. While analysing a problem with step control

The problem is as follows. Below shows the layered structure of 4 solids in which upto 4 time step I have to apply cooling and at the 5^th step I have to apply a displacement tension towards the right and fixing the left end.

So for the vertex I had given

  

For the face to get fixed (or to give constrain the face I had given)

 

For the displacement for the other face I had given

But when I ran the solver I got an error like

 

What will be the reason? Whether I had made any error in the boundary conditions given?

How can I resolve the issue?

[peteroznewman]

I recommend you fix all the left end faces on all the layers and leave them fixed for the entire simulation.

Put a displacement BC on the right end face on the purple layer only, and deactivate that for steps 1-4 while the temperature is changed and the contacts come alive.

In Step 5, make the displacement BC on the right end face come alive and move it to some axial tensile displacement. The purple layer will stretch, and the contacts will stretch all the other layers.

[OnkarJ]

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