Learning Forum

[Chandra Sekhar Narra]

Hi all,

Can anyone tell me, how to give time steps(initial,minimum and maximum steps) for a creep analysis of 1000hours in Ansys?

Thanks in advance!

Kind regards

Chandra

[Sampat Kumar]

 

Hi Chandra, 
I don’t think there will be an option to enter the time in hours in the Steps tab of the analysis setting. you can enter the time in the second by using the exponent of 10 to reduce the numerical number. 

 


Regards,
Sampat

 

[Chandra Sekhar Narra]

Hi Sampat,

Thank you very much for your response.

I understand it now. I tried what you suggested but there some problem with initial time step, minimum time step and maximum time step. Actually it is working for larger time step sizes and I would like to reduce it, then Iam getting the errors?

Could you please help me with this regard?

Kind regards

Chandra

[Chandra Sekhar Narra]

Hi Sampat,

Thank you very much for your response.

I understand it now. I tried to implement as per your suggestion. I gave initial time step, minimum time step and maximum time steps as larger values and it is working. But as far as I all these time steps sizes should be smaller values, I tried to give smaller values and am getting errors. Here am attaching the error.

Could you please help me with this regard?

Kind regards

Chandra

[Sampat Kumar]

 

Hi Chandra, 
Will you please check the error in the solver file? . Please check the error in the solver output file and upload the screenshot too. Please upload a screenshot of the analysis setting where you have entered the time step. Please upload both the time steps that you have used for successful and unsuccessful simulations.

Regards, 
Sampat

 

[Chandra Sekhar Narra]

Hi Sampat,

I checked there, I can see only warnings but not errors. Below am attaching the screenshot of it.

Also am attaching the screenshots of Analysis settings both successful and unsuccessful simulations.

Here I posted the solution information.

Solver Output

 

 ANSYS Mechanical                                 


 *------------------------------------------------------------------*
 |                                                                  |
 |   W E L C O M E   T O   T H E   A N S Y S (R)  P R O G R A M     |
 |                                                                  |
 *------------------------------------------------------------------*




 ***************************************************************
 *                  ANSYS 14.5 LEGAL NOTICES                   *
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          *****  ANSYS COMMAND LINE ARGUMENTS  *****
  BATCH MODE REQUESTED (-b)    = NOLIST
  INPUT FILE COPY MODE (-c)    = COPY
     4 PARALLEL CPUS REQUESTED
  START-UP FILE MODE           = NOREAD
  STOP FILE MODE               = NOREAD

 00408972          VERSION=WINDOWS x64     RELEASE= 14.5     UP20120918
 CURRENT JOBNAME=file  10:36:58  JUN 13, 2023 CP=      3.297


 PARAMETER _DS_PROGRESS =     999.0000000   

 /INPUT FILE= ds.dat  LINE=       0



 DO NOT WRITE ELEMENT RESULTS INTO DATABASE

 *GET  _WALLSTRT  FROM  ACTI  ITEM=TIME WALL  VALUE=  10.6161111   

 TITLE=
 teststatic--Static Structural (C5)                                           


 SET PARAMETER DIMENSIONS ON  _WB_PROJECTSCRATCH_DIR
  TYPE=STRI  DIMENSIONS=      248        1        1

 PARAMETER _WB_PROJECTSCRATCH_DIR(1) = J:\Projekte\18\18-020_AIF_FOGI_FlexOfenbetrw\4_Simulation\FEM_mechanical\Chandra\Draft\REFTIMESTEP\ChandraREfe1\_ProjectScratch\Scr26D5\

 SET PARAMETER DIMENSIONS ON  _WB_SOLVERFILES_DIR
  TYPE=STRI  DIMENSIONS=      248        1        1

 PARAMETER _WB_SOLVERFILES_DIR(1) = J:\Projekte\18\18-020_AIF_FOGI_FlexOfenbetrw\4_Simulation\FEM_mechanical\Chandra\Draft\REFTIMESTEP\ChandraREfe1\teststatic_files\dp0\SYS-3\MECH\

 SET PARAMETER DIMENSIONS ON  _WB_USERFILES_DIR
  TYPE=STRI  DIMENSIONS=      248        1        1

 PARAMETER _WB_USERFILES_DIR(1) = J:\Projekte\18\18-020_AIF_FOGI_FlexOfenbetrw\4_Simulation\FEM_mechanical\Chandra\Draft\REFTIMESTEP\ChandraREfe1\teststatic_files\user_files\
 --- Data in consistent MKS units.

 MKS UNITS SPECIFIED FOR INTERNAL   
  LENGTH        (l)  = METER (M)
  MASS          (M)  = KILOGRAM (KG)
  TIME          (t)  = SECOND (SEC)
  TEMPERATURE   (T)  = CELSIUS (C)
  TOFFSET            = 273.0
  CHARGE        (Q)  = COULOMB
  FORCE         (f)  = NEWTON (N) (KG-M/SEC2)
  HEAT               = JOULE (N-M)

  PRESSURE           = PASCAL (NEWTON/M**2)
  ENERGY        (W)  = JOULE (N-M)
  POWER         (P)  = WATT (N-M/SEC)
  CURRENT       (i)  = AMPERE (COULOMBS/SEC)
  CAPACITANCE   (C)  = FARAD
  INDUCTANCE    (L)  = HENRY
  MAGNETIC FLUX      = WEBER
  RESISTANCE    (R)  = OHM
  ELECTRIC POTENTIAL = VOLT

 INPUT  UNITS ARE ALSO SET TO MKS
1

 ***** ANSYS - ENGINEERING ANALYSIS SYSTEM  RELEASE 14.5     *****
 ANSYS Mechanical                                 
 00408972          VERSION=WINDOWS x64   10:36:58  JUN 13, 2023 CP=      3.391

 teststatic--Static Structural (C5)                                           


          ***** ANSYS ANALYSIS DEFINITION (PREP7) *****
 *********** Nodes for the whole assembly ***********
 *********** Elements for Body 1 "Probe_Teil3" ***********
 *********** Send User Defined Coordinate System(s) ***********
 *********** Set Reference Temperature ***********
 *********** Send Materials ***********
   IMPLICIT CREEP OPTION is used, CREEP MODEL is  10
 *********** Fixed Supports ***********
 *********** Define Force Using Surface Effect Elements ***********
 *********** Define Body Force Temperature ***********


 ***** ROUTINE COMPLETED *****  CP =         6.156


 --- Number of total nodes = 70239
 --- Number of contact elements = 189
 --- Number of spring elements = 0
 --- Number of bearing elements = 0
 --- Number of solid elements = 41056
 --- Number of total elements = 41245

 *GET  _WALLBSOL  FROM  ACTI  ITEM=TIME WALL  VALUE=  10.6166667   
 ****************************************************************************
 *************************    SOLUTION       ********************************
 ****************************************************************************

 *****  ANSYS SOLUTION ROUTINE  *****


 PERFORM A STATIC ANALYSIS
  THIS WILL BE A NEW ANALYSIS

 LARGE DEFORMATION ANALYSIS

 NEW SOLUTION CONTROL OPTION IS ACTIVATED,
 THE FOLLOWING COMMANDS ARE RESET TO NEW DEFAULTS:
 AUTOTS, DELTIM, NSUB, CNVTOL, LNSRCH, PRED, NROPT,
 TINTP, CUTCONTROL, OPNCONTROL, MONITOR, NEQIT, SSTIF, KBC.

 CONTACT TIME PREDICTIONS ARE BASED ON ELEMENT KEYOPT(7) SPECIFIED

 USE SPARSE MATRIX DIRECT SOLVER

 CONTACT INFORMATION PRINTOUT LEVEL    1

 NLDIAG: Nonlinear diagnostics CONT option is set to ON.
         Writing frequency : each ITERATION.

 DEFINE RESTART CONTROL FOR LOADSTEP LAST
 AT FREQUENCY OF LAST AND NUMBER FOR OVERWRITE IS    0

 DELETE RESTART FILES OF ENDSTEP
 ****************************************************
 ******************* SOLVE FOR LS 1 ****************

 SELECT       FOR ITEM=TYPE COMPONENT=   
  IN RANGE       2 TO        2 STEP        1

      189  ELEMENTS (OF    41245  DEFINED) SELECTED BY  ESEL  COMMAND.

 SELECT      ALL NODES HAVING ANY ELEMENT IN ELEMENT SET.

      426 NODES (OF    70239  DEFINED) SELECTED FROM
      189 SELECTED ELEMENTS BY NSLE COMMAND.

 SPECIFIED SURFACE LOAD PRES FOR ALL SELECTED ELEMENTS  LKEY =  1   KVAL = 1
      SET ACCORDING TO TABLE PARAMETER = _LOADVARI41X                   

 SPECIFIED SURFACE LOAD PRES FOR ALL SELECTED ELEMENTS  LKEY =  2   KVAL = 1
      SET ACCORDING TO TABLE PARAMETER = _LOADVARI41Y                   

 SPECIFIED SURFACE LOAD PRES FOR ALL SELECTED ELEMENTS  LKEY =  3   KVAL = 1
      SET ACCORDING TO TABLE PARAMETER = _LOADVARI41Z                   

 ALL SELECT   FOR ITEM=NODE COMPONENT=   
  IN RANGE       1 TO    70239 STEP        1

    70239  NODES (OF    70239  DEFINED) SELECTED BY NSEL  COMMAND.

 ALL SELECT   FOR ITEM=ELEM COMPONENT=   
  IN RANGE       1 TO    41245 STEP        1

    41245  ELEMENTS (OF    41245  DEFINED) SELECTED BY  ESEL  COMMAND.

 PRINTOUT RESUMED BY /GOP

 SELECT      COMPONENT _CM43                          

 SELECT      ALL NODES HAVING ANY ELEMENT IN ELEMENT SET.

    70239 NODES (OF    70239  DEFINED) SELECTED FROM
    41056 SELECTED ELEMENTS BY NSLE COMMAND.

 SPECIFIED BODY FORCE TEMP FOR ALL SELECTED NODES SET ACCORDING TO
 TABLE PARAMETER = _LOADVARI43                    

 ALL SELECT   FOR ITEM=NODE COMPONENT=   
  IN RANGE       1 TO    70239 STEP        1

    70239  NODES (OF    70239  DEFINED) SELECTED BY NSEL  COMMAND.

 ALL SELECT   FOR ITEM=ELEM COMPONENT=   
  IN RANGE       1 TO    41245 STEP        1

    41245  ELEMENTS (OF    41245  DEFINED) SELECTED BY  ESEL  COMMAND.

 USE AUTOMATIC TIME STEPPING THIS LOAD STEP

 USE INITIAL TIME STEP SIZE OF  1.000000     FOR ALL  DEGREES OF FREEDOM
 FOR AUTOMATIC TIME STEPPING:
   USE 0.1000000     AS THE MINIMUM TIME STEP SIZE
   USE  1.000000     AS THE MAXIMUM TIME STEP SIZE

 TIME=  1.0000   

 ERASE THE CURRENT DATABASE OUTPUT CONTROL TABLE.


 WRITE ALL  ITEMS TO THE DATABASE WITH A FREQUENCY OF NONE
   FOR ALL APPLICABLE ENTITIES

 WRITE NSOL ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL
   FOR ALL APPLICABLE ENTITIES

 WRITE RSOL ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL
   FOR ALL APPLICABLE ENTITIES

 WRITE STRS ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL
   FOR ALL APPLICABLE ENTITIES

 WRITE EPEL ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL
   FOR ALL APPLICABLE ENTITIES

 WRITE EPPL ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL
   FOR ALL APPLICABLE ENTITIES

 WRITE EPTH ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL
   FOR ALL APPLICABLE ENTITIES

 WRITE EPCR ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL
   FOR ALL APPLICABLE ENTITIES

 NONLINEAR STABILIZATION CONTROL:
 KEY=OFF



 DO NOT INCLUDE STRAIN RATE EFFECT ON ANALYSIS FROM THIS LOAD STEP ONWARDS  (VISCOPLASTICITY/CREEP ANALYSIS).

 *GET  ANSINTER_  FROM  ACTI  ITEM=INT        VALUE=  0.00000000   

 *IF  ANSINTER_                         ( =   0.00000     )  NE 
      0                                 ( =   0.00000     )  THEN   

 *ENDIF

 *****  ANSYS SOLVE    COMMAND  *****

 *** WARNING ***                         CP =       6.453   TIME= 10:37:00
 Element shape checking is currently inactive.  Issue SHPP,ON or        
 SHPP,WARN to reactivate, if desired.                                   

 *** NOTE ***                            CP =       6.641   TIME= 10:37:00
 The model data was checked and warning messages were found.            
  Please review output or errors file (                                 
 J:\Projekte\18\18-020_AIF_FOGI_FlexOfenbetrw\4_Simulation\FEM_mechanica
 l\Chandra\Draft\REFTIMESTEP\ChandraREfe1\_ProjectScratch\Scr26D5\file.e
 err ) for these warning messages.                                      

 *** SELECTION OF ELEMENT TECHNOLOGIES FOR APPLICABLE ELEMENTS ***
      --- GIVE SUGGESTIONS AND RESET THE KEY OPTIONS ---

 ELEMENT TYPE    1 IS SOLID187. IT IS NOT ASSOCIATED WITH FULLY INCOMPRESSIBLE
 HYPERELASTIC MATERIALS. NO SUGGESTION IS AVAILABLE AND NO RESETTING IS NEEDED.


1

 ***** ANSYS - ENGINEERING ANALYSIS SYSTEM  RELEASE 14.5     *****
 ANSYS Mechanical                                 
 00408972          VERSION=WINDOWS x64   10:37:00  JUN 13, 2023 CP=      6.703

 teststatic--Static Structural (C5)                                           


                       S O L U T I O N   O P T I O N S

   PROBLEM DIMENSIONALITY. . . . . . . . . . . . .3-D                 
   DEGREES OF FREEDOM. . . . . . UX   UY   UZ 
   ANALYSIS TYPE . . . . . . . . . . . . . . . . .STATIC (STEADY-STATE)
   OFFSET TEMPERATURE FROM ABSOLUTE ZERO . . . . .  273.15   
   NONLINEAR GEOMETRIC EFFECTS . . . . . . . . . .ON
   EQUATION SOLVER OPTION. . . . . . . . . . . . .SPARSE            
   CREEP MATERIAL PROPERTIES INCLUDED. . . . . . .YES
   NEWTON-RAPHSON OPTION . . . . . . . . . . . . .PROGRAM CHOSEN  
   GLOBALLY ASSEMBLED MATRIX . . . . . . . . . . .SYMMETRIC 

 *** WARNING ***                         CP =       6.875   TIME= 10:37:01
 Material number 2 (used by element 41057 ) should normally have at     
 least one MP or one TB type command associated with it.  Output of     
 energy by material may not be available.                               

 *** NOTE ***                            CP =       7.000   TIME= 10:37:01
 The step data was checked and warning messages were found.             
  Please review output or errors file (                                 
 J:\Projekte\18\18-020_AIF_FOGI_FlexOfenbetrw\4_Simulation\FEM_mechanica
 l\Chandra\Draft\REFTIMESTEP\ChandraREfe1\_ProjectScratch\Scr26D5\file.e
 err ) for these warning messages.                                      

 *** NOTE ***                            CP =       7.000   TIME= 10:37:01
 This nonlinear analysis defaults to using the full Newton-Raphson      
 solution procedure.  This can be modified using the NROPT command.     

 *** NOTE ***                            CP =       7.016   TIME= 10:37:01
 The conditions for direct assembly have been met.  No .emat or .erot   
 files will be produced.                                                

                      L O A D   S T E P   O P T I O N S

   LOAD STEP NUMBER. . . . . . . . . . . . . . . .     1
   TIME AT END OF THE LOAD STEP. . . . . . . . . .  1.0000   
   AUTOMATIC TIME STEPPING . . . . . . . . . . . .    ON
      STARTING TIME STEP SIZE. . . . . . . . . . .  1.0000   
      MINIMUM TIME STEP SIZE . . . . . . . . . . . 0.10000   
      MAXIMUM TIME STEP SIZE . . . . . . . . . . .  1.0000   
   MAXIMUM NUMBER OF EQUILIBRIUM ITERATIONS. . . .    15
   STEP CHANGE BOUNDARY CONDITIONS . . . . . . . .    NO
   STRESS-STIFFENING . . . . . . . . . . . . . . .    ON
   TERMINATE ANALYSIS IF NOT CONVERGED . . . . . .YES (EXIT) 
   CREEP CRITERION . . . . . . . . . . . . . . . . none
   CONVERGENCE CONTROLS. . . . . . . . . . . . . .USE DEFAULTS
   COPY INTEGRATION POINT VALUES TO NODE . . . . .YES, FOR ELEMENTS WITH
                                                  ACTIVE MAT. NONLINEARITIES
   PRINT OUTPUT CONTROLS . . . . . . . . . . . . .NO PRINTOUT
   DATABASE OUTPUT CONTROLS
      ITEM     FREQUENCY   COMPONENT
       ALL       NONE              
      NSOL        ALL              
      RSOL        ALL              
      STRS        ALL              
      EPEL        ALL              
      EPPL        ALL              
      EPTH        ALL              
      EPCR        ALL              


 SOLUTION MONITORING INFO IS WRITTEN TO FILE= file.mntr                                                                                                                                                                                                                                                          
 MAXIMUM NUMBER OF EQUILIBRIUM ITERATIONS HAS BEEN MODIFIED             
  TO BE, NEQIT = 22, BY SOLUTION CONTROL LOGIC.                         




            **** CENTER OF MASS, MASS, AND MASS MOMENTS OF INERTIA ****

  CALCULATIONS ASSUME ELEMENT MASS AT ELEMENT CENTROID

  TOTAL MASS =  0.19112   

                           MOM. OF INERTIA         MOM. OF INERTIA
  CENTER OF MASS            ABOUT ORIGIN        ABOUT CENTER OF MASS

  XC = -0.10619          IXX =   0.3672E-04      IXX =   0.4264E-05
  YC =  0.11654E-01      IYY =   0.2852E-02      IYY =   0.6904E-03
  ZC = -0.58301E-02      IZZ =   0.2871E-02      IZZ =   0.6905E-03
                         IXY =   0.2365E-03      IXY =   0.1628E-08
                         IYZ =   0.1299E-04      IYZ =  -0.3473E-10
                         IZX =  -0.1183E-03      IZX =  -0.9838E-10


  *** MASS SUMMARY BY ELEMENT TYPE ***

  TYPE      MASS
     1  0.191125   

 Range of element maximum matrix coefficients in global coordinates
 Maximum = 5.886034316E+09 at element 41035.                            
 Minimum = 65445040.8 at element 2557.                                  

   *** ELEMENT MATRIX FORMULATION TIMES
  TYPE    NUMBER   ENAME      TOTAL CP  AVE CP

     1     41056  SOLID187     31.734   0.000773
     2       189  SURF154       0.234   0.001240
 Time at end of element matrix formulation CP = 20.859375.              

 ALL CURRENT ANSYS DATA WRITTEN TO FILE NAME= file.rdb
  FOR POSSIBLE RESUME FROM THIS POINT
     FORCE CONVERGENCE VALUE  = 0.1614      CRITERION= 0.8234E-03

 SPARSE MATRIX DIRECT SOLVER.
  Number of equations =      210162,    Maximum wavefront =    291

 *** NOTE ***                            CP =      25.422   TIME= 10:37:12
 The initial memory allocation (-m) has been exceeded.                  
  Supplemental memory allocations are being used.                       
  Memory allocated for solver =               1142.858 MB
  Memory required for in-core =                989.487 MB
  Optimal memory required for out-of-core =     83.514 MB
  Minimum memory required for out-of-core =     43.605 MB

 *** NOTE ***                            CP =      25.641   TIME= 10:37:12
 The Sparse Matrix solver is currently running in the in-core memory    
 mode.  This memory mode uses the most amount of memory in order to     
 avoid using the hard drive as much as possible, which most often       
 results in the fastest solution time.  This mode is recommended if     
 enough physical memory is present to accommodate all of the solver     
 data.                                                                  
 curEqn=  75168  totEqn= 210162 Job CP sec=     37.891
      Factor Done=  50% Factor Wall sec=      2.806 rate=20008.4 Mflops
 curEqn= 210162  totEqn= 210162 Job CP sec=     50.562
      Factor Done= 100% Factor Wall sec=      5.968 rate=18639.3 Mflops
 Sparse solver maximum pivot= 5.885850936E+09 at node 15690 UY.         
 Sparse solver minimum pivot= 92391.3386 at node 9092 UZ.               
 Sparse solver minimum pivot in absolute value= 92391.3386 at node 9092 
 UZ.                                                                    
     DISP CONVERGENCE VALUE   = 0.1490E-01  CRITERION= 0.4978E-05
    EQUIL ITER   1 COMPLETED.  NEW TRIANG MATRIX.  MAX DOF INC= -0.9956E-04
     FORCE CONVERGENCE VALUE  =  3.778      CRITERION= 0.8744E-01
     DISP CONVERGENCE VALUE   = 0.4000E-05  CRITERION= 0.4978E-05 <<< CONVERGED
    EQUIL ITER   2 COMPLETED.  NEW TRIANG MATRIX.  MAX DOF INC=  0.2861E-07
     FORCE CONVERGENCE VALUE  = 0.1547E-05  CRITERION= 0.8922E-01 <<< CONVERGED
    >>> SOLUTION CONVERGED AFTER EQUILIBRIUM ITERATION   2

   *** ELEMENT RESULT CALCULATION TIMES
  TYPE    NUMBER   ENAME      TOTAL CP  AVE CP

     1     41056  SOLID187     26.359   0.000642
     2       189  SURF154       0.062   0.000331

   *** NODAL LOAD CALCULATION TIMES
  TYPE    NUMBER   ENAME      TOTAL CP  AVE CP

     1     41056  SOLID187      0.641   0.000016
     2       189  SURF154       0.000   0.000000
 *** LOAD STEP     1   SUBSTEP     1  COMPLETED.    CUM ITER =      2
 *** TIME =   1.00000         TIME INC =   1.00000   


 *** ANSYS BINARY FILE STATISTICS
  BUFFER SIZE USED= 16384
      136.438 MB WRITTEN ON ELEMENT SAVED DATA FILE: file.esav
      107.188 MB WRITTEN ON ASSEMBLED MATRIX FILE: file.full
       51.125 MB WRITTEN ON RESULTS FILE: file.rst
 *************** Write FE CONNECTORS *********

 WRITE OUT CONSTRAINT EQUATIONS TO FILE= file.ce                                                                                                                                                                                                                                                            
 ****************************************************
 *************** FINISHED SOLVE FOR LS 1 *************
 ****************************************************
 ******************* SOLVE FOR LS 2 ****************

 PRINTOUT RESUMED BY /GOP

 USE AUTOMATIC TIME STEPPING THIS LOAD STEP

 USE INITIAL TIME STEP SIZE OF  1.000000     FOR ALL  DEGREES OF FREEDOM
 FOR AUTOMATIC TIME STEPPING:
   USE  1.000000     AS THE MINIMUM TIME STEP SIZE
   USE  10.00000     AS THE MAXIMUM TIME STEP SIZE

 TIME= 0.36000E+07

 ERASE THE CURRENT DATABASE OUTPUT CONTROL TABLE.


 WRITE ALL  ITEMS TO THE DATABASE WITH A FREQUENCY OF NONE
   FOR ALL APPLICABLE ENTITIES

 WRITE NSOL ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL
   FOR ALL APPLICABLE ENTITIES

 WRITE RSOL ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL
   FOR ALL APPLICABLE ENTITIES

 WRITE STRS ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL
   FOR ALL APPLICABLE ENTITIES

 WRITE EPEL ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL
   FOR ALL APPLICABLE ENTITIES

 WRITE EPPL ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL
   FOR ALL APPLICABLE ENTITIES

 WRITE EPTH ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL
   FOR ALL APPLICABLE ENTITIES

 WRITE EPCR ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL
   FOR ALL APPLICABLE ENTITIES

 NONLINEAR STABILIZATION CONTROL:
 KEY=OFF



 INCLUDE STRAIN RATE EFFECT ON ANALYSIS FROM THIS  LOAD STEP ONWARDS  (VISCOPLASTICITY/CREEP ANALYSIS).

 IMPLICIT CREEP RATIO CONTROL           =    1.000   

 *****  ANSYS SOLVE    COMMAND  *****

 *** WARNING ***                         CP =     108.016   TIME= 10:37:42
 Material number 2 (used by element 41057 ) should normally have at     
 least one MP or one TB type command associated with it.  Output of     
 energy by material may not be available.                               

 *** NOTE ***                            CP =     108.203   TIME= 10:37:42
 The step data was checked and warning messages were found.             
  Please review output or errors file (                                 
 J:\Projekte\18\18-020_AIF_FOGI_FlexOfenbetrw\4_Simulation\FEM_mechanica
 l\Chandra\Draft\REFTIMESTEP\ChandraREfe1\_ProjectScratch\Scr26D5\file.e
 err ) for these warning messages.                                      

 *** NOTE ***                            CP =     108.203   TIME= 10:37:42
 This nonlinear analysis defaults to using the full Newton-Raphson      
 solution procedure.  This can be modified using the NROPT command.     
1

 ***** ANSYS - ENGINEERING ANALYSIS SYSTEM  RELEASE 14.5     *****
 ANSYS Mechanical                                 
 00408972          VERSION=WINDOWS x64   10:37:45  JUN 13, 2023 CP=    112.500

 teststatic--Static Structural (C5)                                           


                      L O A D   S T E P   O P T I O N S

   LOAD STEP NUMBER. . . . . . . . . . . . . . . .     2
   TIME AT END OF THE LOAD STEP. . . . . . . . . . 0.36000E+07
   AUTOMATIC TIME STEPPING . . . . . . . . . . . .    ON
      STARTING TIME STEP SIZE. . . . . . . . . . .  1.0000   
      MINIMUM TIME STEP SIZE . . . . . . . . . . .  1.0000   
      MAXIMUM TIME STEP SIZE . . . . . . . . . . .  10.000   
   MAXIMUM NUMBER OF EQUILIBRIUM ITERATIONS. . . .    15
   STEP CHANGE BOUNDARY CONDITIONS . . . . . . . .    NO
   STRESS-STIFFENING . . . . . . . . . . . . . . .    ON
   TERMINATE ANALYSIS IF NOT CONVERGED . . . . . .YES (EXIT) 
   CREEP CRITERION . . . . . . . . . . . . . . . .  1.0000   
   CONVERGENCE CONTROLS. . . . . . . . . . . . . .USE DEFAULTS
   COPY INTEGRATION POINT VALUES TO NODE . . . . .YES, FOR ELEMENTS WITH
                                                  ACTIVE MAT. NONLINEARITIES
   PRINT OUTPUT CONTROLS . . . . . . . . . . . . .NO PRINTOUT
   DATABASE OUTPUT CONTROLS
      ITEM     FREQUENCY   COMPONENT
       ALL       NONE              
      NSOL        ALL              
      RSOL        ALL              
      STRS        ALL              
      EPEL        ALL              
      EPPL        ALL              
      EPTH        ALL              
      EPCR        ALL              


 SOLUTION MONITORING INFO IS WRITTEN TO FILE= file.mntr                                                                                                                                                                                                                                                          
 MAXIMUM NUMBER OF EQUILIBRIUM ITERATIONS HAS BEEN MODIFIED             
  TO BE, NEQIT = 22, BY SOLUTION CONTROL LOGIC.                         

     FORCE CONVERGENCE VALUE  = 0.1547E-05  CRITERION= 0.8569E-01
     DISP CONVERGENCE VALUE   = 0.9295E-09  CRITERION= 0.4978E-05 <<< CONVERGED
    EQUIL ITER   1 COMPLETED.  NEW TRIANG MATRIX.  MAX DOF INC= -0.7226E-11
     FORCE CONVERGENCE VALUE  = 0.4362E-11  CRITERION= 0.8743E-01 <<< CONVERGED
    >>> SOLUTION CONVERGED AFTER EQUILIBRIUM ITERATION   1
 *** LOAD STEP     2   SUBSTEP     1  COMPLETED.    CUM ITER =      3
 *** TIME =   2.00000         TIME INC =   1.00000   
 *** CREEP RATIO = 0.2626E-14   CRITERION FOR CREEP RATIO CONTROL =  1.000   
 *** AUTO STEP TIME:  NEXT TIME INC =  1.0000      UNCHANGED

     FORCE CONVERGENCE VALUE  = 0.1547E-05  CRITERION= 0.8569E-01
     DISP CONVERGENCE VALUE   = 0.9295E-09  CRITERION= 0.4978E-05 <<< CONVERGED
    EQUIL ITER   1 COMPLETED.  NEW TRIANG MATRIX.  MAX DOF INC=  0.7226E-11
     FORCE CONVERGENCE VALUE  = 0.4359E-11  CRITERION= 0.8743E-01 <<< CONVERGED
    >>> SOLUTION CONVERGED AFTER EQUILIBRIUM ITERATION   1
 *** LOAD STEP     2   SUBSTEP     2  COMPLETED.    CUM ITER =      4
 *** TIME =   3.00000         TIME INC =   1.00000   
 *** CREEP RATIO = 0.2634E-14   CRITERION FOR CREEP RATIO CONTROL =  1.000   
 *** AUTO TIME STEP:  NEXT TIME INC =  1.5000      INCREASED (FACTOR = 1.5000)

     FORCE CONVERGENCE VALUE  = 0.1554E-10  CRITERION= 0.8569E-01
     DISP CONVERGENCE VALUE   = 0.1240E-14  CRITERION= 0.4978E-05 <<< CONVERGED
    EQUIL ITER   1 COMPLETED.  NEW TRIANG MATRIX.  MAX DOF INC= -0.9581E-17

 

Thank you!

Kind regards

Chandra

[Sampat Kumar]

Hi Chandra, 
There might be a possibility that the minimum time steps that you provided are not enough to converge the problem, and the solver may require more iteration steps to converge the problem. We usually increase the sub-steps if the solution is not converging. If you are able to get the solution as per your expectations in the required time, then it's good to follow that.

Regards, 
Sampat

[Chandra Sekhar Narra]

Hi Sampat,

I understand it now.Thank you very much for clarification.

I will follow this.

Kind regards

Chandra

[Sampat Kumar]

Hi Chandra, 
you can also check that When you decrease the end time of the simulation, in that case, you can try to lower the minimum time step and increase the maximum time step in the simulation. This will not change your simulation result but the solver will get the required steps for iteration to converge the simulation. 

Regards, 
Sampat

 

[Chandra Sekhar Narra]

Hi Sampat,

I will check this and I think what you said is correct, I tried this before, lower initial and minimum time steps  had worked for lesser step end time without any  errors.

Thanks for much clarification.

Kind regards

Chandra