8595078 Ansys Example 0153 Offshore Structure
Transcript of 8595078 Ansys Example 0153 Offshore Structure
Course in ANSYS
Example0153
Computational Mechanics, AAU, EsbjergANSYS
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
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Example – Offshore structure
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Example – Import IGES
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Utility Menu > File > Import > IGES
Press OK
Example – Import IGES
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Browse to find offshore-structure-skeleton.igs
Press OK
Example - Display
Select Front View
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Example - Numbering
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Set Keypoint numbers OnSet Line numbers On
Example - Numbering
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Example – Element TypePreprocessor > Element Type > Add/Edit/Delete
Press Add
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Example - Element TypePreprocessor > Element Type > Add/Edit/Delete
Press Options
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Press Help to learn more about theelement.
Example – Real ConstantsPreprocessor > Real Constants > Add
Place the cursoron the relevantelement andpress OK
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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
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Press OK
Example - Material PropertiesPreprocessor > Material Props > Material Models
Double Clickto step in thematerial tree
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Example - Material PropertiesPreprocessor > Material Props > Material Models
Enter:Modulus of elasticity
Enter:Poisson’s ratio
Click hereto Close
Press OK
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Example – Mesh AttributesPreprocessor > Meshing > Mesh Attributes > Line Attributes > Picked Lines
Select Line L7, L1, L8
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Example – Mesh Attributes
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Example – Mesh AttributesPreprocessor > Meshing > Mesh Attributes > Line Attributes > Picked Lines
Select Line L5, L4, L6
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Change to 2
Press OK
2
Example – Mesh Attributes
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Example – Mesh AttributesPreprocessor > Meshing > Mesh Attributes > Line Attributes > Picked Lines
Select Line L2
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Change to 3
Press OK
3
Example – Mesh Attributes
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Example – Mesh AttributesPreprocessor > Meshing > Mesh Attributes > Line Attributes > Picked Lines
Select Line L3
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Change to 4
Press OK
4
Example – Mesh Attributes
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Example - MeshingPreprocessor > Meshing > Size Cntrls > ManualSize > Lines > Picked Lines
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Select/PickLines tospecifymesh sizefor
Press OK when finish with selection
Enter2 for L73 for L64 for L1,L4,L55 for L8
Example - MeshingPreprocessor > Meshing > Mesh > Lines
Select individual lines to be meshed by Picking
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Select all lines defined to be meshed
NB: It is often necessary to “Clear” the model forexample if Element Type is to be changed
Example – Size and Shape
Switch to OnPress OKExample0153 25
Computational Mechanics, AAU, EsbjergANSYS
Example – Display of element
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Example – Analysis Type
Solution > Analysis Type > New Analysis
File > Write DB log fileEnter “example0153.lgw”
Press OK
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Example – Define LoadsSolution > Define Loads > Apply > Structural > Displacement > On Lines
Select line L7, L1, L8 Select UX
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Press OK
Example – Define LoadsSolution > Define Loads > Apply > Structural > Displacement > On Keypoints
Select keypoint 10
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Select All DOF
Press OK
Example – Define LoadsSolution > Define Loads > Apply > Structural > Force/Moment > On Keypoints
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Select keypoint 16
Change to FY
Press OK to finish Enter -10000
Example – Boundary Conditions
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Example - SolveSolution > Solve > Current LS
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Press OK
Example - PostProcessingGeneral Postproc > Plot Results > Deformed Shape
Select “Def+undeformed”and Press OK
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Example – Deformed Shape
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Example – Contour Plot
Press OK Select Stress, von Mises SEQV
Example – Contour Plot
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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?
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File menu
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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.