OptiiStruct Solver won't work. (Simple compression Test)

Keonkim1991

I get the error saying,

I believe it's an error about too many messages popped up.

But my model is pretty simple except it's got lot of elements..

 

Originally I had 3 components: matrix, carbon fiber, and nano material.

1. 2D automesh on surfaces of each component.

2. Created another component for 3D tetramesh using the 2D mesh (no errors occurred).

3. Created RBE2 (rigid) for compression force that applies on the top surface of my structure.

4. Material created for epoxy (applied for all components for my initial trial).

5. Property created as PSOLID as I performed 3D tetramesh.

6. Load collectors were created (SPC selected as surface on the bottom surface, and compression force applied on the independent node of RBE2). 

7. Loadstep created as linear static, SPC and compression force were all selected, and output chosen to be stress and strain.

 

Most cases the error occurs in mesh sections or unassigned components along with the wrong load collectors. But I double-checked all and it's all properly assigned. I am not sure why the OptiStruct is not working.

 

Please help..!!

 

 

P.S. Below is the error message I'm getting from solver view.. 

 

Preserving existing .out file as:
/RESEARCH/MACRO CELL MODEL/Unit Cell Expansion/hypermesh/practice/7 (Load)_004.out
Preserving existing .stat file as:
/RESEARCH/MACRO CELL MODEL/Unit Cell Expansion/hypermesh/practice/7 (Load)_004.stat
 ************************************************************************
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 *** ERROR # 1000 *** in the input data:
 Incorrect data in field # 3.

 ****************
 Too many error messages. Aborting run.
 Current limit is 10000. Use 'MSGLMT' control card to change this value.

 ==== End of solver screen output ==== 

 ==== Job completed ==== 

tinh

'Most cases the error occurs in mesh sections or unassigned components along with the wrong load collectors. But I double-checked all and it's all properly assigned. I am not sure why the OptiStruct is not working.'

 

I don't believe. please send us .fem file

Keonkim1991

Dear Tinh,

 

I ended up skipping 2D surface automesh part and just selected all solid of all components and obtained 3D tetramesh.

 

With the fact that my mesh generation is 3D, property must be PSOLID. Also, the structure is composite, so I chose the material as MAT8, 

 

 

I ran the analysis again, but I am getting an error message of,

 

*** ERROR #  78 ***
 MAT8 data can only be referenced by PSHELL data.
 This error is for MAT8 #        1,
 referenced by property #        1.

************************************************************************

 There were 2 error messages during input processing.
  The first message is repeated below:

  *** ERROR #  78 ***
  MAT8 data can only be referenced by PSHELL data.
  This error is for MAT8 #        1,
  referenced by property #        1.

 

So okay, I thought composites must be MAT8, but since the error says MAT8 can only be PSHELL. So I changed MAT8 to MAT1, ran the analysis again.

 

 

Now I get this error, PSOLID data can only reference MATHE data? What am I missing here? Could you please point out what I'm messing up here and what needs to be changed in order to run this initial trial?

 

*** ERROR #  78 ***
 PLSOLID data can only reference MATHE data.
 This error is for MID #        1,
 referenced by PLSOLID #        1.

************************************************************************

 A fatal error has been detected during input processing:

  *** ERROR #  78 ***
  PLSOLID data can only reference MATHE data.
  This error is for MID #        1,
  referenced by PLSOLID #        1.
 

I'm attaching fem file for your review. Could you please point out what I've messed up in the setting part, and what needs to be modified/changed in order to run this initial trial?

 

Thank you,

Ken

Unable to find an attachment - read this blog

tinh

Please update the property with card PSOLID instead of PLSOLID

Keonkim1991

Okay I just did, but I still get this error message,

 

 *** ERROR #  78 ***
 MAT8 data can only be referenced by PSHELL data.
 This error is for MAT8 #        1,
 referenced by property #        1.

************************************************************************

 A fatal error has been detected during input processing:

  *** ERROR #  78 ***
  MAT8 data can only be referenced by PSHELL data.
  This error is for MAT8 #        1,
  referenced by property #        1.

************************************************************************

 ==== End of solver screen output ==== 

 ==== Job completed ==== 

 

 

tinh

please update mat8 to mat1

Keonkim1991

Oh it worked, but shouldn't composite materials always be assigned as MAT8? Is it because of the case I'm approaching it with 3D meshing, so I must apply MAT1 in order to define PSOLID elements?

tinh

Hi

for 3d you may have to use mat9

Keonkim1991

What's the difference between MAT1, 8, 9? 

tinh

mat8, 9 have different parameters in different directions

for 2d and 3d respectively

 

for more information please search reference help

Keonkim1991

One more question,

 

I have nano components inside of the composite structure and want it to be interacted by the compression force that's applied on the top surface of the structure.

Right now the nano components don't get any reactions due to unassigned boundary conditions.

Here I'm looking for what kind of BC I should make on the nano components that can be connected to the matrix structure in the compression scenario? Should I combine all the components as one solid? Please provide me suggestions..

tinh

I don't know. You should try several methods and compare them.

Altair Forum User

Altair Forum User said:

Right now the nano components don't get any reactions due to unassigned boundary conditions.

Here I'm looking for what kind of BC I should make on the nano components that can be connected to the matrix structure in the compression scenario? Should I combine all the components as one solid? Please provide me suggestions..

If it is just a linear static analysis you can use freeze contact between nano components and bulk component.