MSC Tutorial 3-Member Truss

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Home Academia Curriculum kit 3 MemberTruss

Problem: Consider a three-member truss as shown with P=100 lb and L=10 inches. All members of the

truss have an identical cross-sectional area of 3.14 inches and E of 30E6. The hinged supports joints A, B

and C as free rotation about the z-axis. Using Patran/MD NASTRAN, determine the displacement at point

C.

Note: If you need assistance on a step, just click on it for more information.

Note: Click on images to enlarge.

Step 1 - Create a new Patran database.Click onNewfrom the File menu or from the Defaults Toolbar as shown.1.Type the name of the new database as 3_Member_Truss and click OK.2.In the Approximate Maximum Model Dimensions box, input 10.0. Click OK.3.

3-Member Truss

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Step 2 - Create the geometry of th e 3-member truss usin g th e info rmation from the probl em statement.Under the Geometry tab, click onPoints and select XYZ.1.Input the following point coordinates and click Apply after each point: [0 0 0], [0 10 0], and [-10 0 0]. There are no units inPatran, and therefore it is important to stay consistent in units.

2.

Under the Geometry tab, click onCurves and select Point.3.WithAuto Execute checked, click on Point 1 thenPoint 2, Point 1 thenPoint 3, and Point 2 thenPoint 3.4.


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Step 3 - Create the is otropic material: Elastic Modulus = 30E6Under the Properties tab, select Isotropic.1.Input steel as the Material Name and then select Input Properties ....2.Input Elastic Modulus = 30E6. Click OKand Apply.3.

Step 4 - Create a 1D Rod physical property and apply the isotro pic material to th e model.Click onRod under the 1D Properties section.1.InputTruss as the Property Set Name and then click on Input Properties ....2.Click onSelect Material and select steel. Enter 3.14 as the Area. Click OK.3.Click onSelect Application Regionand then click on the Select Members box. Screen pick the curves. Click Add, OKthen4.


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Apply.

Step 5 - Create boundary condition s: Apply the Displ acement Constrain t.Under the Load/BCs tab, select Displacement Constraint.1.Input New Set Name as the ClampAB, and click on Input Data.2.

EnterTranslations as and Rotationas . Click OK.3. Click onSelect Application Regionclick on the Select Geometry Entries box. In the selection toolbar, select Node. Screenselect the bottom nodes. Click Add, OKthenApply.

4.

Repeat this process to create ClampC that contrains rotation in the x and y-direction on node C but does not contraintranslation (theTranslationbox should be < , , >).

5.


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Step 6 -Apply the fo rces show n i n the pro blem statemen t.Click onForce. Enter New Set Name as Force and click on Input Data....1.Enter as the Force and click OK.2.Click onSelect Application Region3.Now,Click on the Select Geometry Entries box. In the selection toolbar, select Node. Screen select the Node as shown. Click

Add, OKthenApply.

4.


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Step 7 - Create a fini te element mesh w ith a Global Edge Length of 10.Under the Meshing tab, click onObject as Mesh andType curve.1.Set theTopology to BAR2. Click on the Curve List box and screen select the all curve. Set theGlobal Edge Lengthto 10.Click onApply.

2.

SetAction to Equivalence and click Apply (This will eliminate duplicate nodes at the intersection of two curves).3.


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Step 8 - Run a steady state analysis usi ng MD Nastran.Under the Analysis tab, select Entire Model. Ensure that theJ ob Name box is filled with a name and click Apply.1.

Step 9 -At tach results fi le, then c reat e fr inge pl ot . Record t he di splacemen t an d st res s i nduced inthe truss.

Click onXDB under the Access Results submenu.1.Ensure the appropriateJ ob Name is selected and click Apply.2.Under the Results tab, select Fringe/Deformation.3.Plot Displacement, Translational. Set Quantity to X Component. Click Apply. Repeat forY Component.4.


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An alyt ical Soluti on - Verify the resul ts by calcu lating th e analytical solu tion .


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Substitute: P=100 lb, L=1 in, E=30e6 psi, A=3.14 in2 in the above equation.Results:

U3 = 6.183 X 10-5

inches

V3 = -3.185 X 10-5

inches

MD Nastran results forU3 = 6.187298E-05 inches

MD Nastran results forV3 = -3.184716E-05 inches

(You can open the '3_Member_Truss.f06' file with Notepad to view your results)

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MSC Tutorial 3-Member Truss

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