Code_Aster ®
Version
4.0
Titrate:
SZLZ102 Fatigue with various methods of counting
Date:
19/01/98
Author (S):
A. Mr. DONORE
Key:
V9.01.102-A Page:
1/6
Organization (S): EDF/IMA/MN
Handbook of Validation
V9.01 booklet: Tire
Document: V9.01.102
SZLZ102 - Fatigue with various methods of
counting
Summary:
This test relates to the methods of countings of cycles (RAINFLOW, RCCM) starting from a history of
loading in constraints.
Starting from a simple history of loading defined by DEFI_FONCTION [U4.21.02], one extracts the cycles
elementary by the method of counting of cycles of the RAINFLOW [R7.04.01], then by the method of
counting of cycles RCCM [R7.04.01].
One also tests the taking into account of the coefficient of stress concentration KT.
This example is a test of validation of software POSTDAM developed by Département REME, provided in
Manuel de Validation of version 1.0 of this software.
The results provided by operator POST_FATIGUE [U4.67.01] are completely identical to those provided by
software POSTDAM.
Handbook of Validation
V9.01 booklet: Tire
HI-75/96/038 - Ind A
Code_Aster ®
Version
4.0
Titrate:
SZLZ102 Fatigue with various methods of counting
Date:
19/01/98
Author (S):
A. Mr. DONORE
Key:
V9.01.102-A Page:
2/6
1
Problem of reference
1.1 Geometry
The analysis consists in extracting the elementary cycles starting from a history from loading in
constraints.
· First call to POST_FATIGUE:
One extracts the elementary cycles by the method of counting of cycles RAINFLOW, on
history of loading 1 (T).
· Second call to POST_FATIGUE:
One extracts the elementary cycles by the method of counting of cycles RCCM, on the history of
loading 1 (T).
· Third call to POST_FATIGUE:
One extracts the elementary cycles by the method of counting of cycles RAINFLOW, on
the history of loading 2 (T) and one uses a coefficient of stress concentration KT = 2.
· Fourth call to POST_FATIGUE:
One extracts the elementary cycles by the method of counting of cycles RCCM, on the history of
loading 2 (T) and one uses a coefficient of stress concentration KT = 2.
History of the loading
T
0.
1.
2.
3.
4.
5.
6.
7.
8.
1 (T)
0.
500.
200.
400.
300.
500.
- 300.
200.
- 500.
T
0.
1.
2.
3.
4.
5.
6.
7.
8.
2 (T)
0.
250.
100.
200.
150.
250.
- 150.
100.
- 250.
Handbook of Validation
V9.01 booklet: Tire
HI-75/96/038 - Ind A
Code_Aster ®
Version
4.0
Titrate:
SZLZ102 Fatigue with various methods of counting
Date:
19/01/98
Author (S):
A. Mr. DONORE
Key:
V9.01.102-A Page:
3/6
2
Reference solution
2.1
Method of calculation used for the reference solution
This test results from the handbook of validation of software POSTDAM version 1.0. Reference solutions
are given in this document.
2.2
Results of reference
· First call to POST_FATIGUE: method RAINFLOW from 1 (T)
Nb_Cycl = 4
Cycle 1
Vale_Min:
300.
Vale_Max:
400.
Cycle 2
Vale_Min:
200.
Vale_Max:
500.
Cycle 3
Vale_Min:
300.
Vale_Max:
200.
Cycle 4
Vale_Min:
500.
Vale_Max:
500.
· Second call to POST_FATIGUE: method RCCM from 1 (T)
Nb_Cycl = 5
Cycle 1
Vale_Min:
500.
Vale_Max:
500.
Cycle 2
Vale_Min:
300.
Vale_Max:
500.
Cycle 3
Vale_Min:
0.
Vale_Max:
400.
Cycle 4
Vale_Min:
200.
Vale_Max:
300.
Cycle 5
Vale_Min:
88.8889
Vale_Max:
200.
· Third call to POST_FATIGUE: method RAINFLOW from 2 (T) with KT=2.
(Results identical to the first call to POST_FATIGUE since one takes a loading 2 (T) =
1/2 1 (T), then one multiplies the history of loading by a coefficient of concentration of
constraints KT = 2.).
Nb_Cycl = 4
Cycle 1
Vale_Min:
300.
Vale_Max:
400.
Cycle 2
Vale_Min:
200.
Vale_Max:
500.
Cycle 3
Vale_Min:
300.
Vale_Max:
200.
Cycle 4
Vale_Min:
500.
Vale_Max:
500.
· Fourth call to POST_FATIGUE: method RCCM from 2 (T) with KT=2.
(Results identical to the second call to POST_FATIGUE since a loading is taken
2 (T) = 1/2 1 (T), then one multiplies the history of loading by a coefficient of concentration of
constraints KT = 2.).
Nb_Cycl = 5
Cycle 1
Vale_Min:
500.
Vale_Max:
500.
Cycle 2
Vale_Min:
300.
Vale_Max:
500.
Cycle 3
Vale_Min:
0.
Vale_Max:
400.
Cycle 4
Vale_Min:
200.
Vale_Max:
300.
Cycle 5
Vale_Min:
88.8889
Vale_Max:
200.
2.3
Uncertainty on the solution
Analytical solution.
2.4 References
bibliographical
[1]
Handbook of validation of POSTDAM version 1.0. Baker I., Vatin E. HP-14/93/016B
Handbook of Validation
V9.01 booklet: Tire
HI-75/96/038 - Ind A
Code_Aster ®
Version
4.0
Titrate:
SZLZ102 Fatigue with various methods of counting
Date:
19/01/98
Author (S):
A. Mr. DONORE
Key:
V9.01.102-A Page:
4/6
3 Modeling
With
3.1 Functionalities
tested
Order
POST_FATIGUE [U4.67.01]
Key word
Operands
HISTOIRE
SIGM:
COMPTAGE:
“RCCM”
“RAINFLOW”
COEF_MULT
KT:
INFO:
1
Handbook of Validation
V9.01 booklet: Tire
HI-75/96/038 - Ind A
Code_Aster ®
Version
4.0
Titrate:
SZLZ102 Fatigue with various methods of counting
Date:
19/01/98
Author (S):
A. Mr. DONORE
Key:
V9.01.102-A Page:
5/6
4
Results of modeling A
4.1 Values
tested
Identification
Reference
Aster
% difference
First call to POST_FATIGUE
and Troisième call to POST_FATIGUE
NB_CYCL
4.
4.
0.
Cycle 1 VALE_MIN
300.
300.
0.
VALE_MAX
400.
400.
0.
Cycle 2 VALE_MIN
200.
200.
0.
VALE_MAX
500.
500.
0.
Cycle 3 VALE_MIN
- 300.
- 300.
0.
VALE_MAX
200.
200.
0.
Cycle 4 VALE_MIN
- 500.
- 500.
0.
VALE_MAX
500.
500.
0.
Second call to POST_FATIGUE
and Quatrième call to POST_FATIGUE
NB_CYCL
5.
5.
0.
Cycle 1 VALE_MIN
- 500.
- 500.
0.
VALE_MAX
500.
500.
0.
Cycle 1 VALE_MIN
- 300.
- 300.
0.
VALE_MAX
500.
500.
0.
Cycle 1 VALE_MIN
0.
0.
0.
VALE_MAX
400.
400.
0.
Cycle 1 VALE_MIN
200.
200.
0.
VALE_MAX
300.
300.
0.
Cycle 1 VALE_MIN
88.8889
88.8889
0.
VALE_MAX
200.
200.
0.
4.2 Parameters
of execution
Version: 3.06.18
Machine: CRAY C90
Obstruction memory:
8 MW
Time CPU To use:
2.2582 seconds
Handbook of Validation
V9.01 booklet: Tire
HI-75/96/038 - Ind A
Code_Aster ®
Version
4.0
Titrate:
SZLZ102 Fatigue with various methods of counting
Date:
19/01/98
Author (S):
A. Mr. DONORE
Key:
V9.01.102-A Page:
6/6
5
Summary of the results
The results of Code_Aster are identical to the values of reference provided in the handbook of
validation of version 1.0 of POSTDAM.
Handbook of Validation
V9.01 booklet: Tire
HI-75/96/038 - Ind A