course in ansys - aalborg universitethomes.civil.aau.dk/shl/ansysc/ansys-example0241.pdf · ansys...

Course in ANSYS

Example0241

Computational Mechanics, AAU, EsbjergANSYS

Example0241 2Computational Mechanics, AAU, EsbjergANSYS

Example – Plate with a hole

E = 210000N/mm2

n = 0.3a = 200mmb = 100mmt = 10mmr = 10mms = 100N/mm2

Objective:Determine the maximum stress in the x-direction for point A and display the deformation figureTasks:How should this be modelled?Compare results with results obtained from norm calculations?Topics:Element type, Real constants, modeling, mapped mesh, plot results, output graphics, path operations

A

Example - titleUtility Menu > File > Change Jobname/jobname, Example0241 Command line entry

GUI

Enter: Example0241

Utility Menu > File > Change Title/title, Plate with a hole

Enter: Plate with a hole

Example0241 3Computational Mechanics, AAU, EsbjergANSYS

Example – Areas RectanglePreprocessor > Modeling > Create > Areas > Rectangle > By DimensionsCreate an area given by X=(0,100) and Y=(0,50)

Enter 0 orleave empty

Example0241 4Computational Mechanics, AAU, EsbjergANSYS

Enter 100

Enter 50Enter 0 orleave emptyPress OK

Note: Keypoints (4 kp’s) and lines(4 lines) are automatically generated(also numbered automatically)

Example – Areas Rectangle

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Example – Areas CirclePreprocessor > Modeling > Create > Areas > Circle > Solid CircleCreate an area given by (X,Y)=(0, 0) and Radius=10

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Enter 10

Press OKNote: Keypoints (4 kp’s) and lines(4 lines) are automatically generated(also numbered automatically)

Example - Area

Example0241 7Computational Mechanics, AAU, EsbjergANSYS

Example0241 8Computational Mechanics, AAU, EsbjergANSYS

Example - OperatePreprocessor > Modeling > Operate > Booleans > Subtract > AreasCreate the final area by subtracting the circular area from the rectangular area

Note: Bottom left corner of ANSYS GUI

Press OK

Select the rectangular area and press OK

Note: Bottom left corner of ANSYS GUI

Select the circular area

Example – Areas

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Example - Numbering

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Switch on Keypoint, Line, and Area Numbers

Example - List Menu

List Keypoint, Lines, and Areas

Example0241 11Computational Mechanics, AAU, EsbjergANSYS

Example - Plot Menu

Plot Keypoint, Lines, and Areas

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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

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Press Options

Press Help to learn more about theelement.

Select Plane strs w/thk

Example – Real ConstantsPreprocessor > Real Constants > Add

Place the cursoron the relevantelement andpress OK

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Example - Real ConstantsPreprocessor > Real Constants > Add

Press OK

Press Closeto finish

10

Enter 10

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Example - Material PropertiesPreprocessor > Material Props > Material Models

Double Clickto step in thematerial tree

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Example - Material Properties

Example0241 18Computational Mechanics, AAU, EsbjergANSYS

Preprocessor > Material Props > Material ModelsEnter 210000Modulus of elasticity

Enter 0.3Poisson’s ratio

Click hereto Close

Press OK

Example - MeshingPreprocessor > Meshing > Size Cntrls > ManualSize > Lines > Picked Lines

Example0241 19Computational Mechanics, AAU, EsbjergANSYS

Select/PickLines tospecifymesh sizefor

Pick the twolongest lines

Press OK when finish with selection

See next page

Example – Mesh Size

3 Element subdivisions

5 Element subdivisions

6 Element subdivisions

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Example – Concatenate Lines

Example0241 21Computational Mechanics, AAU, EsbjergANSYS

Select L2 and L3 to create a topologically foursidedgeometryPress OK

Example - MeshingPreprocessor > Meshing > Mesh > Areas > Mapped > 3 or 4 sided

Example0241 22Computational Mechanics, AAU, EsbjergANSYS

Select individual areasto be meshed

Select all areas definedto be meshed

NB: It is often necessary to “Clear” the model forexample if Element Type or model geometry is to be changed

Example – Mapped Mesh

Example0241 23Computational Mechanics, AAU, EsbjergANSYS

Example – Analysis Type

Solution > Analysis Type > New Analysis

File > Write DB log fileEnter “example0241.lgw”

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Example – Define LoadsSolution > Define Loads > Apply > Structural > Displacement > On Lines

Select UY to fix the plate in the y-direction

Select the bottom straight line

Press OK

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Example – Define LoadsSolution > Define Loads > Apply > Structural > Displacement > On Lines

Select UX to fix the plate in the x-direction

Select the left straight line

Press OK

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Example – Define LoadsSolution > Define Loads > Apply > Structural > Pressure > On lines

Select the right straight line

Enter -100

Press OK to finish

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Note: Pressure acts normal and inward to a surface

Example - Save

Display of Analysis model

Save the model

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Example - SolveSolution > Solve > Current LS

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Press OK

Example - SolvePress Close

Press hereto Close

Example0241 30Computational Mechanics, AAU, EsbjergANSYS

Example - PostProcessingGeneral Postproc > Plot Results > Deformed Shape

Select “Def+undeformed”and Press OK

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Example - PostProcessing

Read Maximum displacement: DMX

Example0241 32Computational Mechanics, AAU, EsbjergANSYS

Example – Contour PlotGeneral Postproc > Plot Results > Contour Plot > Nodal Sol

Select Stress

Select SX for stresses in x-direction

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Example – Contour Plot

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Example – Select - Entities

See next page for selection

Example0241 35Computational Mechanics, AAU, EsbjergANSYS

Example – Select Nodes

Select the indicated nodes

Note: the selection order is important –start from the hole

Example0241 36Computational Mechanics, AAU, EsbjergANSYS Enter OK when finished

Example – List Results

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Select Stress, SCOMP

Press OK

Example – List Results

Example0241 38Computational Mechanics, AAU, EsbjergANSYS

Example - Plot - Nodes

Plot Nodes

Only 6 FE nodes are displayed – the same nodes as selected previously

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Example – Select - Entities

Select Pick All

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Example - Plot - Nodes

Plot Nodes

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Example - Plot - Nodes

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Example – Define Path

See next page for selection

Example – Define Path - By Nodes

Select the indicated nodes

Note: the selection order is important –start from the hole

Example0241 44Computational Mechanics, AAU, EsbjergANSYS Enter OK when finished

Example – Define Path - By Nodes

Enter an appropiate name, e.g. SX

Enter OK

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Example – Map onto Path

Select Stress, SX

Press OK

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Example – Plot Path on Graph

Select SX

Press OK

Example – Plot Path on Graph

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Example – Comments/Questions

• Change the element type to a second order element type and rerun?

• The “example0241.lgw” can be edited in “Notepad”

• Will the shape or the number of elements affect the solution?

• Determine the shear stress in the lines of symmetry?

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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.