slide1 megn 424: computer aided engineering lab 6 - 2d truss analysis with solidworks simulation and...
TRANSCRIPT
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Slide1
MEGN 424:Computer Aided Engineering
LAB 6 - 2D Truss Analysis with SolidWorks Simulation and
Mathcad
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Slide2
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
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Slide3
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)
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Slide4
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)
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Slide5
CAD model from THW 3
Open SolidWorks (SW), then open YI Truss LAB6.sldprt from c:\scratch\yourinitials
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Slide6
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
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Slide7
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.
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Slide8
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.
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Slide9
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
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Slide10
Check Reports Folders
Simulation>Options
Select the report folder.It will automatically use c:\scratch\your initials
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Slide11
Check Results Folder locationin the FEA Study
This should happen automatically
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Slide12
Configure – Truss Elements
• Select the structural members, Right Click
• Edit Definition• Choose Truss and OK
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Slide13
Configure – Apply Material
Right click, Apply Aluminum: 1060 Alloy material to all bodies
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Slide14
Define joints
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
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Slide15
Define the Joints (nodes)
Right click Joint Group
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Slide16
Apply Restraints
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
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Slide17
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
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Slide18
Apply z-Restraints to prevent rigid body motion
Select type: reference geom.
zero translation to Front (z) Plane
(Fixtures)
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Slide19
Apply x,y-Restraint to upper left Joint
Immovable Fixture = all translations fixed
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Slide20
Apply x-Restraint to lower left Joint
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Slide21
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
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Slide22
Apply loads
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 loadsh. Define contact setsi. Set meshing optionsj. Mesh the part or assemblyk. Run the analysisl. Create displays of results
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Slide23
Apply Load
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Slide24
Run and display results
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. Run the analysisi. Create displays of results
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Slide25
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.
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Slide26
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
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Slide27
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
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Slide28
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
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Slide29
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
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Slide30
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.