displacement and load
displacement and load
(OP)
Dear all,
I put a field of displacements to a shell plate. Now I'm trying to put an external load to the same plate mantaining the displacements. The problem is that abaqus seems not see the last load applied.
I tried also to add it in the input file by hand but the results are quiete wird.
The only solution that I can see is to put the load and then see the displacements results so I can add all the displacements due from the load with that one that I put as input. But the procedure is quiete long.
Do you know other way?
Thanks,
Albert
I put a field of displacements to a shell plate. Now I'm trying to put an external load to the same plate mantaining the displacements. The problem is that abaqus seems not see the last load applied.
I tried also to add it in the input file by hand but the results are quiete wird.
The only solution that I can see is to put the load and then see the displacements results so I can add all the displacements due from the load with that one that I put as input. But the procedure is quiete long.
Do you know other way?
Thanks,
Albert





RE: displacement and load
I find your description difficult to follow.
Is your field of displacemnts applied to the entire plate?
If yes, then any applied load would be ignored.
If no but your load is still applied within the field of displacements then again it will be ignored.
An applied displacement is a fixation (or support), loads cannot be applied to a support.
I apologise if I've completely misunderstood your post.
RE: displacement and load
corus
RE: displacement and load
Sorry, but that doesn't make any sense to me either !
Applied displacements represent boundary condition restraints that will not be present in a load only case, so I can not see how it would be valid to combine the two, as it is not like combining different load only cases.
RE: displacement and load
Sorry if I not explain myself enough clearly. The displacement are applied to the entire plate so johnhors you are right in your first post. I cannot apply displacements and load to the same element is that right?
And Cours you right as well but what I wanted to do is to compare the case you mentionaed with a case with one step simulation where everything is applied at the same time.
Thanks,
Albert1981
RE: displacement and load
Yes, you cannot apply displacements and loads to the same NODE, it does not make any sense ! There will be an "equivalent" set of loads which would give you the same displacements you require, this can be obtained from the restraint force reactions. Thus applying an additional set of loads on top of the equivalent set of loads will produce different displacements.
RE: displacement and load
corus
RE: displacement and load
I was trying to give load and displacement to the same elements but to differents nodes. I wanted to apply the external load only the a free edge of the plate while the rest of the plate has a given displacements.
corus,
I'm doing a static elastic analysis so I can do the superimposition of the two separete case(YESdisplacementNOLoad and NOdisplacementYESload). I think physically it will be alright.
thanks you all,
albert1981
RE: displacement and load
Should I have removed the displacement in the second step at the same time as I applied the load?
Thanks,
Gurmeet
RE: displacement and load
it's seems that you cannot apply at the same element a displacement and a load in the same step. I think that once you apply the displacement in a node that will fix the node at this displacement. like a boundary condition fixed so you cannot moove it further.
Once you applied a displacement you can not do anything else, if anybody know a way to applied load or further stresses to a fixed displacements please let us know.
thanks,
Albert