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Customer Training Material

or s op .

Contact Control

Mechanical

WS3.1-1ANSYS, Inc. Proprietary

2010 ANSYS, Inc. All rights reserved.Release 13.0

November 2010


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Introduction to ANSYS Mechanical

Customer Training MaterialGoals

Workshop 3.1 investigates contact behavior on a simple assembly. It

is meant to illustrate how rigid body motion can occur as a result of

improper contact set up.

Problem statement:

The model consists of a simple assembly file.

Our goal is to set up contact among the parts in the assembly and see

how non symmetric loading can effect the results.



November 2010


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Customer Training MaterialAssumptions

Well assume the friction between the arm shaft and the holes in the

side plates is negligible. Well make the same assumption for the

contact between the arm shaft and the stop shaft. Finally well

assume the stop shaft is fixed to each of the side plates.

Arm Shaft

Side Plate

Side Plate



November 2010


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Customer Training MaterialProject Schematic

Open the Project page.

From the Units menu verify:

Project units are set to US Customary (lbm, in, s, F, A, lbf, V).

Display Values in Project Units is checked (on).



November 2010


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Customer Training Material. . . Project Schematic

1. In the Toolbox, double click

Static Structural to create a

new analysis system.

1.

2. RMB on the Geometry cell

and Import Geometry.

2.

_ . .



November 2010


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Customer Training MaterialPreprocessing

3. Double click the Model cell to open the

Mechanical application.3.

4. Set/check the working Unit System:

Units > U.S Customary (in, lbm, lbf, F, s, V, A)

4.



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Customer Training Material. . . Preprocessing

5. RMB the Connections branch

and Rename Based on

Definition.

5.

now defined with respect to the

parts associated with each. Notice

. . ,

etc.) is also shown.



November 2010


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Customer Training Material. . . Preprocessing

6. Based on the assumptions stated earlier

change 3 of the contact regions to No

Separation as shown here: a.

a. Use the CTRL key and select the 3

contact regions shown here.

b. In the details change the contact type to

.

Each contact region could be changed

individually, selecting all 3 merely saves

time.



November 2010


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Customer Training MaterialEnvironment

7. Fix the assembly (highlight the

Static Structural branch (A5):

a. Select the 2 faces on the ends of the

Side Plates.

b. RMB > Insert > Fixed Support.

a.

b.



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Customer Training Material. . . Environment

8. Apply a force load to the ArmShaft:

a. Select the end line on the top of the

ArmShaft.

b. RMB > Insert > Force.

c. In the force details change to

Component

a.

. et:

Y component = - 10 lbf (minus 10)

Z component = +1

b.

d.

c.



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Customer Training MaterialInitial Solution

9. Highlight the Solution branch (A6)and RMB > Insert > Deformation >Total. 9.

. o ve you w see a warn ng

message that the model may beunconstrained).

10.

to view the result.

Although slight, we can see theArmShaft is beginning to movesideways. We have no contact or

motion as it is currently set up. Ifthe magnitude of the load becomeslarge enough, the solution will fail.



November 2010


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Customer Training MaterialModified Environment

11. Add a frictionless support to the

ArmShaft:

a. Select one of the faces on the end of

the shaft for the ArmShaft.

b. RMB > Insert >Frictionless Support.

Either end of the shaft can be chosen.

a.

b.

A frictionless support provides a

constraint which is normal to the

surface. In this case the shaft will befree to rotate but cannot move out of

plane (in this case the Z direction is



November 2010

constrained).


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Customer Training MaterialModified Result

Once again solve the model and inspect the deformations. As can

be seen the ArmShaft is now prevented from moving.

In settin u contact models it is im ortant to assess what motions

have and have not, been accounted for.



November 2010

m1 contact arm

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