8595078 ansys example 0153 offshore structure
TRANSCRIPT
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Course in ANSYS
Example0153
Computational Mechanics, AAU, EsbjergANSYS
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Example – Offshore structureObjective:Display the deflection figure and von Mises stress distributionTasks:Import geometry from IGES. Display the deflection figure? Display the von Mises stress distribution?
E = 210000N/mm2
n = 0.3F = -10000
F
Example0153 2Computational Mechanics, AAU, EsbjergANSYS
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Example – Offshore structure
Example0153 3Computational Mechanics, AAU, EsbjergANSYS
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Example – Import IGES
Example0153 4Computational Mechanics, AAU, EsbjergANSYS
Utility Menu > File > Import > IGES
Press OK
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Example – Import IGES
Example0153 5Computational Mechanics, AAU, EsbjergANSYS
Browse to find offshore-structure-skeleton.igs
Press OK
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Example - Display
Select Front View
Example0153 6Computational Mechanics, AAU, EsbjergANSYS
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Example - Numbering
Example0153 7Computational Mechanics, AAU, EsbjergANSYS
Set Keypoint numbers OnSet Line numbers On
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Example - Numbering
Example0153 8Computational Mechanics, AAU, EsbjergANSYS
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Example – Element TypePreprocessor > Element Type > Add/Edit/Delete
Press Add
Example0153 9Computational Mechanics, AAU, EsbjergANSYS
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Example - Element TypePreprocessor > Element Type > Add/Edit/Delete
Press Options
Example0153 10Computational Mechanics, AAU, EsbjergANSYS
Press Help to learn more about theelement.
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Example – Real ConstantsPreprocessor > Real Constants > Add
Place the cursoron the relevantelement andpress OK
Example0153 11Computational Mechanics, AAU, EsbjergANSYS
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Example - Real ConstantsPreprocessor > Real Constants > Add
Press Closeto finish
Enter OD=60 and TKWALL=3
Enter OD=40 and TKWALL=3
Enter OD=26 and TKWALL=2
Enter OD=30 and TKWALL=2
Add 4 Sets
Example0153 12Computational Mechanics, AAU, EsbjergANSYS
Press OK
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Example - Material PropertiesPreprocessor > Material Props > Material Models
Double Clickto step in thematerial tree
Example0153 13Computational Mechanics, AAU, EsbjergANSYS
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Example - Material PropertiesPreprocessor > Material Props > Material Models
Enter:Modulus of elasticity
Enter:Poisson’s ratio
Click hereto Close
Press OK
Example0153 14Computational Mechanics, AAU, EsbjergANSYS
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Example – Mesh AttributesPreprocessor > Meshing > Mesh Attributes > Line Attributes > Picked Lines
Select Line L7, L1, L8
Example0153 15Computational Mechanics, AAU, EsbjergANSYS Press OK
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Example – Mesh Attributes
Example0153 16Computational Mechanics, AAU, EsbjergANSYS
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Example – Mesh AttributesPreprocessor > Meshing > Mesh Attributes > Line Attributes > Picked Lines
Select Line L5, L4, L6
Example0153 17Computational Mechanics, AAU, EsbjergANSYS
Change to 2
Press OK
2
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Example – Mesh Attributes
Example0153 18Computational Mechanics, AAU, EsbjergANSYS
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Example – Mesh AttributesPreprocessor > Meshing > Mesh Attributes > Line Attributes > Picked Lines
Select Line L2
Example0153 19Computational Mechanics, AAU, EsbjergANSYS
Change to 3
Press OK
3
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Example – Mesh Attributes
Example0153 20Computational Mechanics, AAU, EsbjergANSYS
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Example – Mesh AttributesPreprocessor > Meshing > Mesh Attributes > Line Attributes > Picked Lines
Select Line L3
Example0153 21Computational Mechanics, AAU, EsbjergANSYS
Change to 4
Press OK
4
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Example – Mesh Attributes
Example0153 22Computational Mechanics, AAU, EsbjergANSYS
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Example - MeshingPreprocessor > Meshing > Size Cntrls > ManualSize > Lines > Picked Lines
Example0153 23Computational Mechanics, AAU, EsbjergANSYS
Select/PickLines tospecifymesh sizefor
Press OK when finish with selection
Enter2 for L73 for L64 for L1,L4,L55 for L8
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Example - MeshingPreprocessor > Meshing > Mesh > Lines
Select individual lines to be meshed by Picking
Example0153 24Computational Mechanics, AAU, EsbjergANSYS
Select all lines defined to be meshed
NB: It is often necessary to “Clear” the model forexample if Element Type is to be changed
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Example – Size and Shape
Switch to OnPress OKExample0153 25
Computational Mechanics, AAU, EsbjergANSYS
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Example – Display of element
Example0153 26Computational Mechanics, AAU, EsbjergANSYS
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Example – Analysis Type
Solution > Analysis Type > New Analysis
File > Write DB log fileEnter “example0153.lgw”
Press OK
Example0153 27Computational Mechanics, AAU, EsbjergANSYS
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Example – Define LoadsSolution > Define Loads > Apply > Structural > Displacement > On Lines
Select line L7, L1, L8 Select UX
Example0153 28Computational Mechanics, AAU, EsbjergANSYS
Press OK
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Example – Define LoadsSolution > Define Loads > Apply > Structural > Displacement > On Keypoints
Select keypoint 10
Example0153 29Computational Mechanics, AAU, EsbjergANSYS
Select All DOF
Press OK
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Example – Define LoadsSolution > Define Loads > Apply > Structural > Force/Moment > On Keypoints
Example0153 30Computational Mechanics, AAU, EsbjergANSYS
Select keypoint 16
Change to FY
Press OK to finish Enter -10000
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Example – Boundary Conditions
Example0153 31Computational Mechanics, AAU, EsbjergANSYS
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Example - SolveSolution > Solve > Current LS
Example0153 32Computational Mechanics, AAU, EsbjergANSYS
Press OK
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Example - PostProcessingGeneral Postproc > Plot Results > Deformed Shape
Select “Def+undeformed”and Press OK
Example0153 33Computational Mechanics, AAU, EsbjergANSYS
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Example – Deformed Shape
Example0153 34Computational Mechanics, AAU, EsbjergANSYS
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Example0153 35Computational Mechanics, AAU, EsbjergANSYS
Example – Contour Plot
Press OK Select Stress, von Mises SEQV
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Example – Contour Plot
Example0153 36Computational Mechanics, AAU, EsbjergANSYS
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Example – Comments/Questions
• Could the model be modeled with beam elements instead of pipe elements?
• The “example0153.lgw” can be edited in “Notepad”
• Will the number of elements affect the solution?
Example0153 37Computational Mechanics, AAU, EsbjergANSYS
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File menu
Example0153 38Computational Mechanics, AAU, EsbjergANSYS
Clears (zeros out) the database stored in memory. Clearing the database has the same effect as leaving and reentering the ANSYS program, but does not require you to exit.
You can include commands to be executed when the program starts up in the start71.ans file.