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

Example0153 15Computational Mechanics, AAU, EsbjergANSYS Press OK

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.