計算subcase 3 時，不知道什么原因出現了單元扭曲

這個問題提示是因為模型變形過大，導致了網格畸變，進而停止計算的。解決方法，嘗試把載荷變小，或者采用更多載荷子步輸出，查看結果，看哪個位置變形導致的問題。

@Mr.謝  

呃，subcase3  計算到一半說單元破壞。這個可能需要看下模型，不清楚你是由于單元本身有問題，還是由于某種約束導致的。如果你確認你的網格質量是沒有問題的話，你可以設置nlmon監控一下計算過程。

@李西順 out 文件我貼上來了，有勞了，謝謝

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

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 **        Optimization Software from Altair Engineering, Inc.         **

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 **                    18324 MB RAM,  65329 MB swap                    **

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 **  COPYRIGHT (C) 1996-2017                 Altair Engineering, Inc.  **

 ** All Rights Reserved.  Copyright notice does not imply publication. **

 **         Contains trade secrets of Altair Engineering, Inc.         **

 ** Decompilation or disassembly of this software strictly prohibited. **

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

 *** OptiStruct defaults set from:

   install config file: F:\work\Altair\Altair 2017\/hwsolvers/optistruct.cfg.

 NOTE # 9199

 MSGLMT=STRICT is active, all messages will be printed.

 You can suppress some less important warning messages by use of

  MSGLMT=BRIEF or UNREF (in config file or in the input data).

 4 PARAM(s) were set:

    CHECKEL,NO

    FLLWER,1

    LGDISP,1

    POST,0

 *** WARNING 1949: All EIGRL/EIGRA bulk data are not referenced.

 *** WARNING # 4968

 Hash assembly is activated to calculate follower effect.

 *** WARNING # 6328

 Loadcase 3 contains a CSTRESS output request but NLOUT incremental

 output isn't available for that result type. Results will be output

 for the last increment exclusively.

 *** WARNING # 6328

 Loadcase 3 contains a CSTRAIN output request but NLOUT incremental

 output isn't available for that result type. Results will be output

 for the last increment exclusively.

 *** WARNING # 340

 RBE3 element 2.

 has nonzero weights at rotational (456) dofs of independent grids.

 This practice may result in undesirable

  load distribution - use with caution.

 *** WARNING # 340

 RBE3 element 3.

 has nonzero weights at rotational (456) dofs of independent grids.

 This practice may result in undesirable

  load distribution - use with caution.

 *** WARNING # 340

 RBE3 element 4.

 has nonzero weights at rotational (456) dofs of independent grids.

 This practice may result in undesirable

  load distribution - use with caution.

 *** WARNING # 340

 RBE3 element 5.

 has nonzero weights at rotational (456) dofs of independent grids.

 This practice may result in undesirable

  load distribution - use with caution.

 *** WARNING # 340

 RBE3 element 6.

 has nonzero weights at rotational (456) dofs of independent grids.

 This practice may result in undesirable

  load distribution - use with caution.

 Number of RBE3 with rotational dofs at independent nodes =       33

 *** INFORMATION # 3433

 MUMPS solver is used by default for nonlinear analysis at subcase 3.

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

OPTIMIZATION FILE AND PARAMETER INFORMATION :

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

  FEM model file               : 

     H:/xll-data/Reanalysis/B725A/B725A_MyMax/B725A_MyMax_NLSTAT_LGDISP_rev0.0.fem

  Output files prefix          : 

     H:/xll-data/Reanalysis/B725A/B725A_MyMax/B725A_MyMax_NLSTAT_LGDISP_rev0.0

  Model read from files:

     H:/xll-data/Reanalysis/B725A/B725A_MyMax/B725A_MyMax_NLSTAT_LGDISP_rev0.0.fem

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

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

FINITE ELEMENT MODEL DATA INFORMATION :

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

  Total # of Grids (Structural)        :    131989

  Total # of Elements                  :    135198

  Total # of Rigid Elements            :        33

  Total # of Rigid Element Constraints :       198

  Total # of Degrees of Freedom        :    783303

  (Structural)

  Total # of Non-zero Stiffness Terms  :  22284795

  Element Type Information

  ------------------------

   CHEXA    Elements   :     4406

   CPENTA   Elements   :        8

   CONM2    Elements   :       18     

   CQUAD4   Elements   :   130416     

   CTRIA3   Elements   :      350     

  Load and Boundary Information

  -----------------------------

   FORCE Sets        :         6

   SPC   Sets        :         1

  Material and Property Information

  ---------------------------------

   PSOLID Cards      :         1

   PCOMP(G)(P) Cards :     11566

   MAT1   Cards      :         1

   MAT8   Cards      :        11

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

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

OPTIMIZATION PROBLEM PARAMETERS :

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

 NO DESIGN MATERIAL OR DESIGN VARIABLES FOUND  : ANALYSIS ONLY

   ------------------------

   Static Subcase Summary :

   ------------------------

   ----------   --------  --------

   Subcase ID    SPC ID   FORCE ID

   ----------   --------  --------

        1            2           19

        3            2           19

   ----------   --------  --------

   Run Type                        :   Analysis Only

   Run at location                 : H:/xll-data/Reanalysis/B725A/B725A_MyMax/

   Scratch file directory          : H:/xll-data/Reanalysis/B725A/B725A_MyMax/

                                     Free space:    99.769 GB

   Number of CPU processors        :          1

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

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

MEMORY ESTIMATION INFORMATION :

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

 Solver Type is:  Sparse-Matrix Solver

                  Direct Method

 Current Memory (RAM)                                    :    5764 MB

 (Note: MUMPS Solver Allocates Memory Separately.) 

 Estimated Minimum Memory (RAM) for Out of Core Solution :    5494 MB

 Recommended Memory (RAM) for Out of Core Solution       :    5764 MB

 Recommended Memory (RAM) for In-Core Solution           :    5764 MB

 (Note: Memory for MUMPS Solver is Included in Estimation.) 

DISK SPACE ESTIMATION INFORMATION :

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

 Estimated Disk Space for Output Data Files              :    1526 MB

 Estimated Scratch Disk Space for In-Core Solution       :    1300 MB

 Estimated Scratch Disk Space for Out of Core Solution   :    5005 MB

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

BEGINNING ANALYSIS SOLUTION ....

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

ANALYSIS RESULTS :

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

ITERATION   0

        Nonlinear  iteration  summary for    Subcase        3

 Starting load increment 1 Current increment 1.0000E-001

  Subcase         3  Load step:  1.0000E-01

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

               Nonlinear Error Measures  Gap and Contact Element Status  Maximum

 Iter Avg. U    EUI      EPI      EWI    Open Closed Stick Slip Frozen  Plststrn

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

  1  3.36E-01 1.00E+00 1.01E-02 1.01E-02     0     0     0     0     0  0.00E+00

  2  3.36E-01 1.42E-02 1.85E-05 9.06E-08     0     0     0     0     0  0.00E+00

  3  3.37E-01 1.66E-03 1.00E-05 1.26E-08     0     0     0     0     0  0.00E+00

  4  3.37E-01 7.00E-04 1.63E-06 3.10E-10     0     0     0     0     0  0.00E+00

 Starting load increment 2 Current increment 1.0000E-001

  Subcase         3  Load step:  2.0000E-01

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

               Nonlinear Error Measures  Gap and Contact Element Status  Maximum

 Iter Avg. U    EUI      EPI      EWI    Open Closed Stick Slip Frozen  Plststrn

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

  1  7.25E-01 5.27E-01 7.75E-03 4.16E-03     0     0     0     0     0  0.00E+00

  2  7.25E-01 1.06E-02 2.33E-05 1.35E-07     0     0     0     0     0  0.00E+00

 *** ERROR # 5905 ***

 Severe element distortion detected,

 analysis aborted.

 Saved the last (NOT-CONVERGED!) iteration for diagnostics.

*** Nonlinear solution failed to converge for Subcase 3 ***

 (Scratch disk space usage for starting iteration = 1325 MB)

Subcase:       1

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

 Label     x-force    y-force    z-force   x-moment   y-moment   z-moment 

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

Sum-App.  4.819E+05  0.000E+00  0.000E+00  0.000E+00  2.055E+10  4.109E+07

Sum-SPCF -4.819E+05 -8.938E-03  5.076E-04  4.031E+02 -2.055E+10 -4.109E+07

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

Subcase:       3

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

 Label     x-force    y-force    z-force   x-moment   y-moment   z-moment 

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

Sum-App.  4.816E+05 -2.604E+02 -6.170E+03  1.679E+07  2.054E+10  5.332E+07

Sum-SPCF  0.000E+00  0.000E+00  0.000E+00  0.000E+00  0.000E+00  0.000E+00

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

Notes: 1. All applied and SPC forces are transferred to

          the origin of the basic coordinate system,

          so that the applied and SPC loads can match.

       2. If spring elements and/or MPCs exist in the model,

          total applied loads may not match total SPC loads.

       3. If axisymmetric elements are present in the model,

          the total x-force and y-force and all the total

          moments are set to zero, according to principles

          of axisymmetric analysis.

       4. If periodic boundary conditions exist in the model,

          total applied loads may not match total SPC loads.

(Running in-core solution)

Volume                              = 2.15669E+010   Mass     = 2.15645E+001

 Subcase   Compliance     Epsilon

       1  1.397912E+09 -1.154584E-07

       3  0.000000E+00

Note : Epsilon = Residual Strain Energy Ratio.

       (not available for subcase with LGDISP, thermal load,

        SUBMODEL or linear gap / fast contact)

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

 ANALYSIS COMPLETED.

 *** SOME ERRORS WERE REPORTED DURING THE RUN,

 *** PLEASE VERIFY RESULTS AS THEY MAY BE INVALID.

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

RESOURCE USAGE INFORMATION

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

 MAXIMUM MEMORY USED                                      9636 MB

   INCLUDING MEMORY FOR MUMPS                             3872 MB

 MAXIMUM DISK SPACE USED                                 14855 MB

   INCLUDING DISK SPACE FOR MUMPS                          492 MB

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

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

COMPUTE TIME INFORMATION

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

 EXECUTION STARTED                         Wed Apr 10 11:37:23 2019    

 EXECUTION COMPLETED                       Wed Apr 10 12:09:43 2019    

 ELAPSED TIME                                         00:32:19

 CPU TIME                                             00:23:49

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

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

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

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

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

 *** SOME ERRORS WERE REPORTED DURING THE RUN,

 *** PLEASE VERIFY RESULTS AS THEY MAY BE INVALID.

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

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

你的out文件貼一下看看