Non-Linear Static Analysis (Creep)
Non-Linear Static Analysis (Creep)
This analysis uses the data of tutorial/08_creep_cylinder.
Analysis target
The analysis targets are the same round bar 1/8 model as in the Non-Linear Static Analysis (Hyperelasticity, part 1) in section 4.3.
| Item | Description | Notes | Reference |
|---|---|---|---|
| Type of analysis | Non-linear static analysis | !SOLUTION,TYPE=NLSTATIC | |
| Number of nodes | 629 | ||
| Number of elements | 432 | ||
| Element type | Eight node hexahedral element | !ELEMENT,TYPE=361 | |
| Material name | MAT1 | !MATERICAL,NAME=MAT1 | |
| Material property | ELASTIC,CREEP | !ELASTIC !CREEP,TYPE=NORTON | |
| Boundary conditions | Restraint,Forced displacement | ||
| Matrix solution | CG/SSOR | !SOLVER,METHOD=CG,PRECOND=1 |
Analysis content
Creep behavior analysis is performed by applying tensile displacement in the axial direction to a round bar. The analysis control data is shown below.
Analysis control data cylinder.cnt.
# Control File for FISTR
## Analysis Control
!VERSION
3
!SOLUTION, TYPE=NLSTATIC
!WRITE,RESULT
!WRITE,VISUAL
## Solver Control
### Boundary Conditon
!BOUNDARY, GRPID=1
LOADS, 3, 3, -7.0
FIX, 3, 3, 0.0
XSYMM, 1, 1, 0.0
YSYMM, 2, 2, 0.0
### STEP
!STEP, SUBSTEPS=5, CONVERG=1.0e-5
BOUNDARY, 1
### Material
!MATERIAL, NAME=MAT1
!ELASTIC
206900.0, 0.29
!CREEP, TYPE=NORTON
1.e-10, 5.0, 0.0
### Solver Setting
!SOLVER,METHOD=CG,PRECOND=1,ITERLOG=YES,TIMELOG=YES
10000, 1
1.0e-8, 1.0, 0.0
## Post Control
!VISUAL,metod=PSR
!surface_num=1
!surface 1
!output_type=VTK
!END
Analysis procedure
Execute the FrontISTR execution command fistr1.
$ cd FrontISTR/tutorial/08_creep_cylinder
$ fistr1 -t 4
(Runs in 4 threads.)
Analysis results
The results of the 5th substep are shown in Figure 4.8.1. A deformation diagram with Mises stress contours is created by REVOCAP_PrePost. A part of the analysis results log file is shown below as numerical data for the analysis results.
Fig. 4.8.1: Analysis results of deformation and Mises stress
Log file 0.log.
fstr_setup: OK
#### Result step= 0
##### Local Summary @Node :Max/IdMax/Min/IdMin####
//U1 0.0000E+00 1 0.0000E+00 1
//U2 0.0000E+00 1 0.0000E+00 1
//U3 0.0000E+00 1 0.0000E+00 1
//E11 0.0000E+00 1 0.0000E+00 1
//E22 0.0000E+00 1 0.0000E+00 1
//E33 0.0000E+00 1 0.0000E+00 1
//E12 0.0000E+00 1 0.0000E+00 1
//E23 0.0000E+00 1 0.0000E+00 1
//E31 0.0000E+00 1 0.0000E+00 1
//S11 0.0000E+00 1 0.0000E+00 1
//S22 0.0000E+00 1 0.0000E+00 1
//S33 0.0000E+00 1 0.0000E+00 1
//S12 0.0000E+00 1 0.0000E+00 1
//S23 0.0000E+00 1 0.0000E+00 1
//S31 0.0000E+00 1 0.0000E+00 1
//SMS 0.0000E+00 1 0.0000E+00 1
##### Local Summary @Element :Max/IdMax/Min/IdMin####
//E11 0.0000E+00 1 0.0000E+00 1
//E22 0.0000E+00 1 0.0000E+00 1
//E33 0.0000E+00 1 0.0000E+00 1
//E12 0.0000E+00 1 0.0000E+00 1
//E23 0.0000E+00 1 0.0000E+00 1
//E31 0.0000E+00 1 0.0000E+00 1
//S11 0.0000E+00 1 0.0000E+00 1
//S22 0.0000E+00 1 0.0000E+00 1
//S33 0.0000E+00 1 0.0000E+00 1
//S12 0.0000E+00 1 0.0000E+00 1
//S23 0.0000E+00 1 0.0000E+00 1
//S31 0.0000E+00 1 0.0000E+00 1
//SMS 0.0000E+00 1 0.0000E+00 1
##### Global Summary @Node :Max/IdMax/Min/IdMin####
//U1 0.0000E+00 1 0.0000E+00 1
//U2 0.0000E+00 1 0.0000E+00 1
//U3 0.0000E+00 1 0.0000E+00 1
//E11 0.0000E+00 1 0.0000E+00 1
//E22 0.0000E+00 1 0.0000E+00 1
//E33 0.0000E+00 1 0.0000E+00 1
//E12 0.0000E+00 1 0.0000E+00 1
//E23 0.0000E+00 1 0.0000E+00 1
//E31 0.0000E+00 1 0.0000E+00 1
//S11 0.0000E+00 1 0.0000E+00 1
//S22 0.0000E+00 1 0.0000E+00 1
//S33 0.0000E+00 1 0.0000E+00 1
//S12 0.0000E+00 1 0.0000E+00 1
//S23 0.0000E+00 1 0.0000E+00 1
//S31 0.0000E+00 1 0.0000E+00 1
//SMS 0.0000E+00 1 0.0000E+00 1
##### Global Summary @Element :Max/IdMax/Min/IdMin####
//E11 0.0000E+00 1 0.0000E+00 1
//E22 0.0000E+00 1 0.0000E+00 1
//E33 0.0000E+00 1 0.0000E+00 1
//E12 0.0000E+00 1 0.0000E+00 1
//E23 0.0000E+00 1 0.0000E+00 1
//E31 0.0000E+00 1 0.0000E+00 1
//S11 0.0000E+00 1 0.0000E+00 1
//S22 0.0000E+00 1 0.0000E+00 1
//S33 0.0000E+00 1 0.0000E+00 1
//S12 0.0000E+00 1 0.0000E+00 1
//S23 0.0000E+00 1 0.0000E+00 1
//S31 0.0000E+00 1 0.0000E+00 1
//SMS 0.0000E+00 1 0.0000E+00 1
...
#### Result step= 5
##### Local Summary @Node :Max/IdMax/Min/IdMin####
//U1 0.0000E+00 1 -4.1863E-01 91
//U2 0.0000E+00 1 -4.1863E-01 88
//U3 0.0000E+00 1 -7.0000E+00 38
//E11 -6.5748E-02 38 -6.9459E-02 7
//E22 -6.5748E-02 50 -6.9459E-02 13
//E33 2.3884E-01 13 2.2745E-01 50
//E12 5.5591E-04 53 -5.7135E-04 10
//E23 1.0510E-04 72 -2.0805E-03 84
//E31 1.0510E-04 64 -2.0805E-03 95
//S11 1.1232E+02 14 -1.1026E+02 49
//S22 1.1232E+02 6 -1.1026E+02 39
//S33 4.7484E+04 7 4.5271E+04 50
//S12 4.2781E+01 53 -4.3872E+01 10
//S23 7.8190E+00 72 -1.6257E+02 84
//S31 7.8190E+00 64 -1.6257E+02 95
//SMS 4.7448E+04 7 4.5307E+04 50
##### Local Summary @Element :Max/IdMax/Min/IdMin####
//E11 -6.6010E-02 759 -6.9186E-02 354
//E22 -6.6010E-02 768 -6.9186E-02 363
//E33 2.3840E-01 363 2.2788E-01 768
//E12 4.9263E-04 766 -5.0184E-04 360
//E23 -1.6179E-05 753 -1.9977E-03 498
//E31 -1.6179E-05 749 -1.9977E-03 489
//S11 1.0954E+02 363 -1.0744E+02 768
//S22 1.0954E+02 354 -1.0744E+02 759
//S33 4.7416E+04 354 4.5337E+04 759
//S12 3.7890E+01 766 -3.8501E+01 360
//S23 -1.3249E+00 753 -1.5632E+02 498
//S31 -1.3250E+00 749 -1.5632E+02 489
//SMS 4.7346E+04 363 4.5406E+04 759
##### Global Summary @Node :Max/IdMax/Min/IdMin####
//U1 0.0000E+00 1 -4.1863E-01 91
//U2 0.0000E+00 1 -4.1863E-01 88
//U3 0.0000E+00 1 -7.0000E+00 38
//E11 -6.5748E-02 38 -6.9459E-02 7
//E22 -6.5748E-02 50 -6.9459E-02 13
//E33 2.3884E-01 13 2.2745E-01 50
//E12 5.5591E-04 53 -5.7135E-04 10
//E23 1.0510E-04 72 -2.0805E-03 84
//E31 1.0510E-04 64 -2.0805E-03 95
//S11 1.1232E+02 14 -1.1026E+02 49
//S22 1.1232E+02 6 -1.1026E+02 39
//S33 4.7484E+04 7 4.5271E+04 50
//S12 4.2781E+01 53 -4.3872E+01 10
//S23 7.8190E+00 72 -1.6257E+02 84
//S31 7.8190E+00 64 -1.6257E+02 95
//SMS 4.7448E+04 7 4.5307E+04 50
##### Global Summary @Element :Max/IdMax/Min/IdMin####
//E11 -6.6010E-02 759 -6.9186E-02 354
//E22 -6.6010E-02 768 -6.9186E-02 363
//E33 2.3840E-01 363 2.2788E-01 768
//E12 4.9263E-04 766 -5.0184E-04 360
//E23 -1.6179E-05 753 -1.9977E-03 498
//E31 -1.6179E-05 749 -1.9977E-03 489
//S11 1.0954E+02 363 -1.0744E+02 768
//S22 1.0954E+02 354 -1.0744E+02 759
//S33 4.7416E+04 354 4.5337E+04 759
//S12 3.7890E+01 766 -3.8501E+01 360
//S23 -1.3249E+00 753 -1.5632E+02 498
//S31 -1.3250E+00 749 -1.5632E+02 489
//SMS 4.7346E+04 363 4.5406E+04 759