i need your help again,
i have asked these topic some time ago:
step 1 static calculation
to add load 1
step 2 static calculation with the internal stress from step 1
to add load 2
now it looks like these, but these is not working:
is these possible without ?
what i have to change / add to my script !?
thnx in advance for your help
here is the answer from my last (simular) request but i don’t get it:
I think your options are:
A) 2 steps with 1 increment (time step) each: Useful if you need to turn constraints on or off and pretty simple to set up - you’ve already done it.
But I’m not sure why you want to remove constraints. For mechanical constraints, that will also release any loads that were reacted by them so it’ll spring back to its un-prestresssed state or fail.
For temperature constraints, it’ll remove the thermal stress. All that remains is permanent changes like plastic deformation. I’ve attached an example with 2 steps and thermal prestress.
The solution shows first the thermal load alone, then a pressure load being applied on top of it.
B) 1 step with 2 or more increments: I find this conceptually more elegant.
You have to define the loads or constraints as functions of time with *AMPLITUDE.
It can just be 2 (time,value) pairs for each thing that changes.
But a limitation is that you can’t turn off constraints between increments.
C) 1 step with 1 increment: If you don’t need to see the results from the prestress and the order of loading isn’t important,
then you can use this and just put the pre-stress and additional loads on together. That’s the usual way for thermal stress analysis.
If the problem is linear, then it’s all you need because of the superposition principle.
D) *RESTART is for closing CCX and coming back to it another day to pick up where it left off.
Unless you particularly want to be able to save it to a file that you can reuse, there’s no need for this.