I think that is OK - MAT4 is for bending-membrane coupling which can occur if material prop. say are are not symmetric with respect to the midsurface of the shell.
Here is something from the documentation:
The MID4 field should be left blank if the material properties are symmetric with...
I think the elements are plane strain elements (MID2 is set to -1 which is plane strain) - in PSHELL MID2 set it to 1 for MAT1 and it will be a mem.+/bending shell element- also the inner and outer tubes/sections are not connected with each other - as suggested run a modal analysis and you will...
Well if you have these values given then use mat8 that is orthotropic and used for composites
For more info on mat2 see the help manual that describes these terms via the relation between stresses and strains, so it is the material matrix that relates the two.
See this for some info on this...
Try to refine the mesh a couple of times and see what happens with the stress there. Just to see if there is a mesh dependency on the results that needs to be addressed, as rb1957 mentioned
Use MAT8 that has E1, E2, ..G12, v12.
Small example below for a single CQUAD4 with PCOMP (two plies 0.001 m thick) and MAT8 (Carbon/Epoxy (AS/3501) Vf = 0.66))
CQUAD4 1 1 1 2 3 40.0000000.000000+0000005
+0000005...
I have little experience in rotordynamics but I have written codes for beam elements that include Coriolis terms due to vibration and internal fluid motion and flow so then this term comes in the damping matrix that is present in dynamics.
See this and the theory manual for a description of...
There is a scripting guide in the help manual.
This video is also
https://m.youtube.com/watch?v=Av_1Jo1IjkI
Finally in the last release r2,one can record scripting macros
You posted in tow forums - I suggest to post in ansys forum since it is relevant to that.
Say shells (CQUAD), will be shell181 in ansys, RBAR (rigid 1D element), could be used as either CERIG or a MPC184 (this is a better/easier option) rigid ansys beam/element, CGAP in nastran (node to node...
Say shells (CQUAD), will be shell181 in ansys, RBAR (rigid 1D element), could be used as either CERIG or a MPC184 (this is a better/easier option) rigid ansys beam/element, CGAP in nastran (node to node contact) would be in ansys a legacy element called contac12.
See the help manual on how...
Again for more specifics on how to apply a forced/disp. excitation in abaqus post this in the abaqus forum.
(just apply either force or displ., and look at the corresponding wave, just try it - most often PZT or EMAT one applies forces since this is what they apply to the structure they are...
I would suggest to delete this and post in the abaqus forum.
For your info normally a force is applied to excite ultrasonic waves - see work from Imperial College NDE group (Peter Cawley,...), they might describe how they are excited in one of their many thesis available on their website
Never done much of wing design.
As for the FSI part mapping and importing pressures should be OK.
This ansys tutorial (fluent) does the same thing with a bit more automation, it basically maps the pressures from fluent on to the structural mesh like you did. So it is mapped on the skin of the...
You cannot have different E values in tensio compression in cast iron, have that in mind, but if you need them to be elastic see my previous post.
So it needs to be used with MP,EX command so if we try to be clever and set different compression stress strain data that would be a larger E mod...
I use this example when teaching nl fea.
Pipe with internal pressure above yield so the inner radius goes plastic. Unload that and the inner radius will go into compression. This is because outer radius material is elastic trying to go back during unloading thus squeezing inner radius into...
It is a plastic model and that is how it should be used, so I do not recommend the following . But if you have to and you are confident that this is OK, Try setting yield to something very high, say 10000mpa for tension and 20000mpa for compression, so it does not yield. I never done this so...
In fluent you can map your pressure on a Nastran imported structural mesh - that would be easier.
Workflow:
- Import Nastran mesh to Fluent via the mapping tool (Fluent: File/FSI Mapping/Surface).
- Map pressures, forces and temperatures from the CFD mesh onto the imported Nastran mesh.
-...
There will probably be more sound in the cabin especially if a structural mode excited coincides with an acoustic mode. Damping must of course play a role in the vibration amplitudes.
This video might be of help. Unfortunately I do not have any experience in vibroacoustic modelling using...
