Error # 332

Altair Forum User

Hey guys, 

 

i'm working on a composite component and get the following massage after starting OptiStruct:

 

NOTE # 9199

 MSGLMT=BRIEF is active, following messages will be suppressed:

 741 742 1935 1052 1305 1436 1437 1051 1931 1932 2010

 Use MSGLMT=STRICT (e.g. in config file) to turn back full printing.

 *** WARNING # 1570

 for material id =         1 referenced from property id =         1.

 Required strength parameters have not been provided or are zero for composite

 material with requested failure index calculation. Failure index will not

 be calculated.

 *** ERROR #  332 ***

 RBE3 element       112636 has singularities - check element data

 *** ERROR #  332 ***

 RBE3 element       112637 has singularities - check element data

 *** ERROR #  332 ***

 RBE3 element       112638 has singularities - check element data

 Number of bad RBE3 elements =        3

 

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

FINITE ELEMENT MODEL DATA INFORMATION :

---------------------------------------

  Total # of Grids (Structural)        :    112960

  Total # of Elements                  :    112629

  Total # of Rigid Elements            :         9

  Total # of Rigid Element Constraints :       738

  Total # of Local Coordinate Systems  :         2

  Total # of Degrees of Freedom        :    662202

  Total # of Non-zero Stiffness Terms  :  18107343

 

  Element Type Information

  ------------------------

   CQUAD4   Elements   :   111849

   CTRIA3   Elements   :      780

  Load and Boundary Information

  -----------------------------

   FORCE Sets        :         1

   SPC   Sets        :         1

  Material and Property Information

  ---------------------------------

   PCOMP(G)(P) Cards :         1

   MAT8   Cards      :         1

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

 

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

 ***** ERROR ENCOUNTERED BEFORE COMPLETING THE CHECK RUN *****

 Current Memory (RAM)                                    :     216 MB

 Estimated Minimum Memory (RAM) for the check run        :     219 MB

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

 This error occurs in module 'prpdrv'.

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

RESOURCE USAGE INFORMATION

--------------------------

 MAXIMUM MEMORY USED                                       216 MB

 MAXIMUM DISK SPACE USED                                     1 MB

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

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

COMPUTE TIME INFORMATION

------------------------

 EXECUTION STARTED                         Fri Mar 07 00:15:17 2014

 EXECUTION COMPLETED                       Fri Mar 07 00:15:23 2014

 ELAPSED TIME                                         00:00:05

 CPU TIME                                             00:00:03

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

 *** PROGRAM STOPPED: FATAL ERROR(s) ENCOUNTERED.

                        ***** END OF REPORT *****

 For Useful OptiStruct Tips and Tricks, go to the URL:

 http://www.altairhyperworks.com/tips.aspx

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

 

 There were 3 error messages during input processing.

  The first message is repeated below:

 

  *** ERROR #  332 ***

  RBE3 element       112636 has singularities - check element data

 

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

 

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

 

 

 ==== Job completed ==== 

 

 

 

what does that mean and what have i got to do, that i can run the simulation successfuly.

I'm very glad if you can help me!!!

 

Altair Forum User

Hello,

 

please check your RBE3 elements, as stated.

 

Set all trans dofs to 1, all rot dofs to zero, all weights to 1. Check if there any free ends, or dependecies.

 

Regards,

Mario

Altair Forum User

I am facing a similar issue, but with a different element type

 *** ERROR #  722 ***
 An invalid rigid element.
 This RBAR is not connected with any structural element.
     RBAR element id =   93759525
 independent grid id =   92382982
   dependent grid id =   91905147
 Note: If this rigid element is also connected with other rigid elements,
 then this error means that there is rigid body mode or mechanism remained
 in this rigid element chain due to lack of connected structural elements.

 *** INFORMATION #  743
 The total number of rigid elements, whose rotational dependent d.o.f.
 are removed because there is no need to constrain those d.o.f., is      5098

 *** INFORMATION #  744
 The number of autospcs that will be created to remove the rigid body
 rotation in RBAR and RBE2 is       1931
 

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

FINITE ELEMENT MODEL DATA INFORMATION :
---------------------------------------

  Total # of Grids (Structural)        :   988838
  Total # of Elements                  :   386052
  Total # of Rigid Elements            :    22408
  Total # of Local Coordinate Systems  :      424

 
  Element Type Information
  ------------------------

   CBEAM    Elements   :      162
   CHEXA    Elements   :   307442
   CTETRA   Elements   :    71392
   CPENTA   Elements   :       90
   CQUAD4   Elements   :     6179     
   CTRIA3   Elements   :      355     
   CBUSH    Elements   :      432     

  Load and Boundary Information
  -----------------------------

   SPC   Sets        :        1

  Material and Property Information
  ---------------------------------

   PBEAM  Cards      :        2
   PSOLID Cards      :       20
   PSHELL Cards      :       35
   PBUSH  Cards      :       23
   MAT1   Cards      :       26

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

 

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

 ***** ERROR ENCOUNTERED BEFORE COMPLETING THE CHECK RUN *****
  
 Current Memory (RAM)                                    :    1372 MB
 Estimated Minimum Memory (RAM) for the check run        :    2170 MB

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

 ***** ERROR ENCOUNTERED BEFORE COMPLETING THE CHECK RUN *****
  

 This error occurs in module 'prpdrv'.

 

Any suggestions ?

Rahul Rajan_21763

The independent node of rigid element is either connected with other rigid element as a dependent node.
Plz check.
 

Altair Forum User

Hi Rahul,

 

Thanks for your reply.

 

The rigid (RBAR) in question is acting as a contact between 3 layered shell structure, I have attached an image of the FEM scenario. The Model has run successfully for NMA [NASTRAN] but in optistruct is throwing error for all the RBAR location.

 

There is also issue about the RAM memory :

Altair Forum User said:

 

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

 ***** ERROR ENCOUNTERED BEFORE COMPLETING THE CHECK RUN *****
  
 Current Memory (RAM)                                    :    1372 MB
 Estimated Minimum Memory (RAM) for the check run        :    2170 MB

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

 

My Sys. Config is :

 

<?xml version="1.0" encoding="UTF-8"?>