fatigue calculations and model recognition

1. Structural Design Code Verifier
Fatigue calculations

2. SDC Verifier
www.sdcverifier.com2
Other FEM programs with FEMAP inside in version 4.0
Embedded
Separate GUI

3. What is SDC Verifier?
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The goal of SDC Verifier is checking structures according
to standards and report generation.

4. Load combinations:
Standard like calculation structure
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Individual Load = single load result
Load Set = combination of loads
Load Group = envelope of set of results

5. Load combinations:
Add/Edit Multiple
www.sdcverifier.com5
Import Load Sets or Load
Groups from MS Excel
Create/edit multiple Load
combinations at once.

6. Tools
www.sdcverifier.com6
 Model recognition:
 Panel Finder;
 Beam Member Finder;
 Joint check
 Complicated Loads: Wind, Buoyancy and Tank Load;
 Rule Based Selector.

7. Model recognition
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Section and Panel finder
Frames
Decks
Longitudinals
Example Frame 36

8. Model recognition
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Plate finder
Beam / Joint
finder
Weld finder

9. Coming in 4.0 Recognition:
Panel, Girder/stiffener and plate
www.sdcverifier.com9

10. What is SDC Verifier?
10

11. SDC Verifier calculation core
www.sdcverifier.com11
No black box but editable

12. Example report
www.sdcverifier.com12

13. What benefits for fatigue?
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14. Fatigue Check example
(mean stress correction)
www.sdcverifier.com14
Classification
Rules based on standards:Load cycles

15. Fatigue: Multiple load cycles in load
groups
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Delta stresses from:
- Load set with type of loading and # cycles
- Group of load sets with # cycles

16. Example load cycle groups
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Make more load cycle groups

17. Fatigue Check example
(mean stress correction)
www.sdcverifier.com17
For single stresses
Combined
Maximum Fatigue Damage
Classification
Rules based on standards:Load cycles

18. 18
Stress concentration at the weld

19. www.sdcverifier.com19
set FAT classes using Joints

20. Example beam model
Classifications
Fatigue damage

21. Weld recognition

22. Weld recognition

23. Сlassification: Weld Quality
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24. 24
Eurocode 3 /EN13001

25. Stress perpendicular to weld Stress parallel with weld
Fatigue resistance depends on
stress direction
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K2 K1
K1 K0
W0
Steel Grade
Permissible stresses zulσD(-1) for k=-1 element group 5 St 52-
3
Notch group W0 W1 W2 K0 K1 K2 K3 K4
Stress
amplitude
163.8 130.3 104.2 118.8 106.1 89.1 63.6 38.2

26. Weld classification

27. Example Detailed results
Weld locations
Calculated fatigue damage result

28. Reality check
Repair
Crack

29. Fatigue
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The following methods are implemented:
 Crane industry like standards (take into account average
stress)
 F.E.M. 1.001 (is referred to a lot from offshore code Loyds
LAME for example)
 DIN 15018
 NEN 2018
 JIS B 8821
 CMAA
 Civil engineering like code (only stress difference)
 Eurocode 3
 IIW
 EN 13001

30. Conclusions SDC Verifier
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 Verification of structure according to standards
 Model recognition facilitates the use of a standard FEM model
 Translation of FEM results in (complicated) code checking results
 Complete documentation of model and results
 Regenerate complete calculation procedure after model changes
 Focus on engineering let SDC Verifier do the bookkeeping
Use 45 days trial to check it yourself (download SDC Verifier on
www.sdcverifier.com and request trial at support@sdcverifier.com);