Enforced diplacement problems
Enforced diplacement problems
(OP)
I'm trying to load a model using enforced displacement and can't get it to work. I've tried using solids and shells with no results. It works fine with beam elements. I've tried both displacement and rotations, loaded on the geometry and nodes, but neither generate any results.
I must be missing something, because I can create the loads without any problems. Any help would be appreciated.
I must be missing something, because I can create the loads without any problems. Any help would be appreciated.





RE: Enforced diplacement problems
The SPCD card works well in both cases.
i.e.
SPCD,NODEID,DOF(1-6),DISPLACEMENT
SPCD,100,4,0.5 (rotation 0.5 rad of node 100)
If, however, you run a modal transient dynamic analysis then the SPCD way of applying forced displacement prevents you from using residual vectors.
Live Long and Prosper !
RE: Enforced diplacement problems
Is there a switch in the analysis options that I'm missing?
RE: Enforced diplacement problems
No, if your analysis is linear and static, then E and nu will do. There must be another thing causing your problem.
RE: Enforced diplacement problems
RE: Enforced diplacement problems
As an exemple:
$
$ FILENAME - CONST2.DAT
$
ID LINEAR,CONST2
SOL 101
TIME 200
CEND
TITLE = ENFORCED DISPLACEMENTS USING SPC1 ONLY
DISP(PLOT) = ALL
SPC = 1
SUBCASE 1
LOAD = 11
SUBCASE 2
LOAD = 12
BEGIN BULK
PARAM POST 0
$
SPC1 1 123456 1 51 2551 2601
$
SPCD 11 1 3 0.0
SPCD 11 51 3 0.0
SPCD 11 2551 3 5.0
SPCD 11 2601 3 5.0
$
SPCD 12 1 3 0.0
SPCD 12 51 3 5.0
SPCD 12 2551 3 5.0
SPCD 12 2601 3 0.0
$
INCLUDE 'const.bulk'
$
ENDDATA
As a final comment, if the SPCD entry is the only loading in the model, a warning message
is issued alerting you to the fact that no loading is specified for your model. If you intended
for the SPCD entry to be the only loading condition, you may safely ignore this warning
message.
Onda
RE: Enforced diplacement problems
Thanks for the help
RE: Enforced diplacement problems
RE: Enforced diplacement problems