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ME 455/555 Intro to Finite Element Analysis Fall 2012 Abaqus/CAE truss tutorial

2012 Hormoz Zareh 1 Portland State University, Mechanical Engineering

Abaqus/CAE Truss Tutorial(Version 6.12)

Problem Description:

Given the truss structure shown below with pinned supports at the wall and 1kN applied load; solve fordisplacements of the free node and the reaction forces of the truss structure. The truss material is steel

with E = 210 GPa and =0.25.

This sample problem is similar to the lecture note example.

1000 mm2

1250 mm2

750 mm

1 kN

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Analysis Steps1. Start Abaqus and choose

to create a new model

database

2. In the model tree double click on the Parts node (or right click on parts and select Create)

3. In the Create Part dialog box (shown above) name the part anda. Select 2D Planarb. Select Deformablec. Select Wired. Set approximate size = 1e. Click Continue

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4. Create the geometry shown below (details not discussed here)

5. Double click on the Materials node in the model tree

a. Name the new material and give it a description

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b.Click on the Mechanical tabElasticityElasticc. Define Youngs Modulus and Poissons Ratio (use base SI units)

i. WARNING: There are no predefined system of units within Abaqus, so the user is

responsible for ensuring that the correct values are specified

d. Click OK

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6. Double click on the Sections node in the model treea. Name the section HorizontalBar and select Beam for both the category and Truss for the

type

b. Click Continuec. Select the material created above (Steel)d. Set cross-sectional area = 0.001 (base SI units, m2)e. Click OK

f. Repeat for the AngledBari. Cross-sectional area=0.00125

7. Expand the Parts node in the model tree, expand the node of the part just created, and double clickon Section Assignments

a. Select the horizontal portion of the geometry in the viewportb. Click Donec. Select the HorizontalBar section created aboved. Click OK

e. Repeat for the angled portion of the geometry

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8. Expand the Assembly node in the model tree and then double click on Instancesa. Select Dependent for the instance typeb. Click OK

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9.Double click on the Steps node in the model treea. Name the step, set the procedure to General, and select Static, Generalb. Click Continuec. Give the step a descriptiond. Click OK

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10.Expand the Field Output Requests node in the model tree, and then double click on F-Output-1 (F-Output-1 was automatically generated when creating the step)

a. Uncheck the variables Strains and Contactb. Click OK

11.Expand the History Output Requests node in the model tree, and then right click on H-Output-1 (H-Output-1 was automatically generated when creating the step) and select Delete

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12.Double click on the BCs node in the model treea. Name the boundary conditioned Pinned and select Displacement/Rotation for the typeb. Click Continuec. Select the endpoints on the left (shift select ) and press Done in the prompt aread. Check the U1 and U2 displacements and set them to 0e. Click OK

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13.Double click on the Loads node in the model treea. Name the load PointLoad and select Concentrated force as the typeb. Click Continuec. Select the vertex on the right and press Done in the prompt aread. Specify CF2 = -1000e. Click OK

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14. In the model tree double click on Mesh for the Truss part, and in the toolbox area click on theAssign Element Type icon

a. Select Standard for element typeb. Select Linear for geometric orderc. Select Truss for familyd. Note that the name of the element (B21) and its description are given below the element

controls

e. Click OK

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15. In the toolbox area click on the Seed Edges icona. Select the entire geometryb. Choose method as By numberc. Define the number of elements along the edges as 1d. Click OK

16. In the toolbox area click on the Mesh Part icona. Click Yes in the prompt area

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ME 455/555 Intr

2012 Hormoz

17. In tto Finite Eleme

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. Click OK

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18. In the model tree double click on the Job nodea. Name the job Trussb. Click Continuec. Give the job a descriptiond. Click OK

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19. In the model tree right click on the job just created (Truss) and select Submita. While Abaqus is solving the problem right click on the job submitted (Truss), and select

Monitor

b. In the Monitor window check that there are no errors or warningsi. If there are errors, investigate the cause(s) before resolving

ii. If there are warnings, determine if the warnings are relevant, some warnings can besafely ignored

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ME 455/555 Intr

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23. In the toolbox area click on the Common Plot Options icona. Note that the Deformation Scale Factor can be set on the Basic tabb. On the Labels tab check Show element labels, Show node labels, and Show node

symbols

i. *Note* the default label colors may need to be adjusted for visibility. They can bechanged in this option box by clicking on the color and picking a new one.

c. Click OK

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ME 455/555 Intr

2012 Hormoz

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25.To change the displayed output, either:a. Change the field output using the tool bar

option shortcut

b. Use the menu bari. Click on ResultsField

Output

ii. Select U - Spatialdisplacement at nodes

iii. Component = U2iv. Click OK

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26.To create a text file containing the stresses, verticaldisplacements, and reaction forces (including the total), in the

menu bar click on ReportField Output

a. For the output variable select (Von) Misesb. On the Setup tab specify the name and the location for

the text file

c. Uncheck the Column totals optiond. Click Apply

e. Back on the Variable tab change the position to Unique Nodalf. Uncheck the stress variable, and select the U2 spatial displacementg. Click Apply

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h. On the Variable tab, uncheck Spatial displacement and select the RF2 reaction forcei. On the Setup tab, check the Column totals optionj. Click OK

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27.Open the .rpt file with any text editor (such as Notepad)a. One thing to check is that the total downward reaction force is equal to the applied load

(1,000 N)

b. Each time Apply is pressed the .rpt file is updated as long as the Append to file option ischecked under Setup

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