Slide1 MEGN 424: Computer Aided Engineering LAB 6 - 2D Truss Analysis with SolidWorks Simulation and...

MEGN 424:Computer Aided Engineering

LAB 6 - 2D Truss Analysis with SolidWorks Simulation and

Mathcad

Finite Element Analysis Process

1.Create a CAD model (completed in THW 3)2.Configure and run an FEA study3.Validate and understand the results

Define Problem and Create Model

1.Create a CAD model (Completed in THW 3)a. Define the problem to be studiedb. Specify unitsc. Build a CAD model (in SolidWorks)

2D Truss Structure FEA

• This system has three truss elements with the geometry shown.

• The three truss elements have a hollow rectangular x-sectional area of 2.089 in2 and wall thickness 0.25 in (shown on the right above).

• Use 1060 Aluminum alloy material• The distance and coordinate units are inches. • The x-translation is fixed at node 1, and the x- and y-translations are fixed at node 3.

• The pin at node 2 is subject to an applied downward vertical force of 750 lbf.

750

Figure 1: A Simple 2D Truss Structure (dimensions shown in inches)

2: (48,36)

1: (0,0)

3: (0,36)

x

y

2

1

3

Figure 2: Weldment profile cross-Section (dimensions in inches)

CAD model from THW 3

Open SolidWorks (SW), then open YI Truss LAB6.sldprt from c:\scratch\yourinitials

Configure and run FEA

2. Configure and run an FEA studya. Choose a study typeb. Specify unitsc. Define a mesh typed. Define materiale. Define joints for a beam or truss

studyf. Apply restraintsg. Apply loads/pressuresh. Define contact setsi. Set meshing optionsj. Mesh the part or assemblyk. Run the analysisl. Create displays of results

Adding SolidWorks Simulation

Open Tools>Add-Ins, Check SolidWorks Simulation, Select OK. You should see Simulation as a new tab in the menu bar.

If Soildworks Simulation is already added, skip the next step.

Adding SolidWorks Simulation

Activate the Simulation tab near the top of the viewing area. Select Simulation (or Study Advisor) > New Study > Static. Name the study LAB6 your initials. The software creates the study in the Simulation study tree.

Set the units in Simulation>Options>Default Options tab to IPS units.

Check Results Folders

Simulation>Options

After saving the file in c:\scratch\your initialschoose the SolidWorks document folder.It will automatically use c:\scratch\ your initials

Check Reports Folders

Simulation>Options

Select the report folder.It will automatically use c:\scratch\your initials

Check Results Folder locationin the FEA Study

This should happen automatically

Configure – Truss Elements

• Select the structural members, Right Click

• Edit Definition• Choose Truss and OK

Configure – Apply Material

Right click, Apply Aluminum: 1060 Alloy material to all bodies

Define joints



Define the Joints (nodes)

Right click Joint Group

Apply Restraints



Apply Restraints (Fixtures)

750

Figure 1: A Simple 2D Truss System (dimensions shown in inches)

2: (48,36)

1: (0,0)

3: (0,36)

x

y

2

1

3

Apply z-Restraints to prevent rigid body motion

Select type: reference geom.

zero translation to Front (z) Plane

(Fixtures)

Apply x,y-Restraint to upper left Joint

Immovable Fixture = all translations fixed

Apply x-Restraint to lower left Joint

Check Restraints (Fixtures: Show All)

750

Figure 1: A Simple 2D Truss System (dimensions shown in inches)

2: (48,36)

1: (0,0)

3: (0,36)

x

y

2

1

3

Apply loads


studyf. Apply restraintsg. Apply loadsh. Define contact setsi. Set meshing optionsj. Mesh the part or assemblyk. Run the analysisl. Create displays of results

Apply Load

Run and display results


studyf. Apply restraintsg. Apply loads/pressuresh. Run the analysisi. Create displays of results

Axial Stress Plot with probe values

Paste a screen shot of this plot into a MS Word document. See the following slides for further LAB submission information.

Verify and understand the results

3. Verify and understand the resultsa. Use Mechanics of Materials (MOM)

fundamentals calculations to approximate results

b. Verify the resultsc. Understand the resultsd. Assess the safety of the designe. Report the results

Draw a free body diagram1. Do it on scratch paper. You don’t have to submit it.2. Choose either compression or tension for each member.3. Draw the force arrows at the end of each member for either tension or compression.

4. Draw the reaction force arrows at each joint to be equal and opposite from the force arrows at each end of the members.

5. Add symbols, dimensions, and force values.

3 (0, 36)

1 (0,0)

2 (48,36)

F = -750 lbf

F3 F1

F2

750

2: (48,36)

1: (0,0)

3: (0,36)

x

y

2

1

3

Determine Forcesin a Mathcad worksheet

ΣFy = 0

R3y F:= R3y 750 lbf=

F3 R3y 750 lbf=:= tension

Determine R3y from the overall truss FBD

Determine internal forces F1 & F2 using the method of joints applied to node 2:

F

3

F1

5= F1

5

3F 1.25 10

3 lbf=:=

F24

5F1 1 10

3 lbf=:=F2

4

F1

5=

Determine the internal force F3 in member 3 using the method of joints:

ΣFy = 0

R3y F:= R3y 750 lbf=

F3 R3y 750 lbf=:= tension 3 R3y

F3

2

F = -750 lbf

3

4

F1

F2

tension

compression

Determine Stresses in a Mathcad worksheet

σ1

F1-

A:= σ1 598.372- psi=

σ2

F2

A:= σ2 478.698 psi=

σ3

F3

A:= σ3 359.023 psi=

Compressive stress

Tensile stress

Tensile stress

A = 2.089 in2

Submit for LAB 6

1. MS Word file with:2. Usual header.3. Screen shot of SWS Axial Stress plot with

3 probe values.4. Screen shot of your mathcad worksheet

that calculates the element internal forces and axial stresses.

5. A comparison of the SWS and Mathcad results.

Create a pdf from the MS Word document named Lname_Fname_LAB6.pdf and submit on Blackboard.

Slide1 MEGN 424: Computer Aided Engineering LAB 6 - 2D Truss Analysis with SolidWorks Simulation and...

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