Fem Beginner 1

[Linusmancer]

Hi all

Im a beginner and trying to modelling a flat plates in the Roark .
i have a plate 10 in x 3 in all edges all edge fixed and a uniform pressure of 100 psi over all the plate. im using the Ls pre-post for now and studying Ls Dyna Implicit Analys.
For modelling my load condition after the mesh generation, have i to load my shells with a load curve (Abscissa time , Ordinate pressure)?

Best Regards

 

[40818]

If your a FEM beginner, then i wouldn't recommend start with a dynamic analysis..

 

[Linusmancer]

Im using implicit for static analys in ls dyna and compare results on the Roark

 

[rb1957]

40818's point was load v time is usually only needed for dynamic analysis, a reasonable deduction given your question.

so i guess one way to answer (not knowing LS Dyna, usually used for dynamic analysis, another clue i thnk 40818 picked up on) is "no" you don't need to apply a time varying load. guessing that LS Dyna wants time-dependent loads, i'd suggest that either you use a different code (one grounded in statics) for this (though i figure you've thought of this already and decided that the only code accessable to you is LS Dyna) or put in a constant load.

good luck

 

[Stringmaker]

In LS-Dyna, even for implicit, it is necessary to associate a load curve with each loading. See the *CONTROL_IMPLICIT keywords and learn them well. There is a lot of power contained in these. The basic idea of what you need to do is:

*CONTROL_IMPLICIT_GENERAL
1,1
*DEFINE_CURVE
1
0,1
1,1
*CONTROL_TERMINATION
1
*LOAD_SEGMENT_SET
SSID,1

Here is an excellent site which has many examples. This should get you familiar with the basics:

http://www.dynaexamples.com/implicit