Week 1 Spur Gear Challenge

#1 Assignment Ansys Workbench

OBJECTIVE-1: Carry out a static structural analysis to find out Equivalent stress, Total deformation and Stress intensity

Case-1:

Material: Cast-Iron

To Find: Deformation,Equivalent Stress, Stress Intensity

• Import the geometry.
• In the Engineering data select the Cast Iron from the library.
• Then update the model and click on modfel and select to edit
• New tab will open with Ansys Mechanical, in the graphic area you can see the Spur gear module.
• In the model tree change the name of the model for the both components to identify them individually.

• Assign the material(Cast iron) to the both the gears.
• Goto Contacts and select the faces (Target & Contact).

Type : Frictional

Behaviour : Symmetric

Formulation : Augmented Lagrange

Interface Treatment : Adjust to Touch

• For one joint select the rotation and enter the rotation degerees in intervals.

• For the other enter the moment in tabular data and eneter the values as below.
• Check the rotation of both the components and if required change the moment values to negative.
• The components to be rotated in opposite direction.
• Click on the solution and insert the required stresses and deformation.
• Here it is Total Deformation,Equivalent stress, Stress Intensity
• Click on solution and Solve.

Equivalent Stress:

Total Deformation:

Stress Intensity:

CASE-2:

Material: Cast Steel

To Find:Equivalent Stress,Deforamtion, Stress Intensity

• Change the material card from the library to Cast Steel.
• Assign the material to both the components and click on the solution clear the generated data.
• Click on solve

Equivalent Stress:

Total Deformation:

Stress Intensity:

CASE-3:

Material: Cast Bronze

To Find:Equivalent Stress,Deforamtion, Stress Intensity

• Change the material card from the library to Cast Steel.
• Assign the material to both the components and click on the solution clear the generated data.
• Click on solve

Equivalent Stress:

Total Deformation:

Stress Intensity:

OBJECTIVE 2: Comparing the results of the three cases

ANALYSIS:

The given three materials, the maximum stress was observed in the root of the teeth. Simlarly, the stress intensity measured was also found to be

maximum in the same region.

Deformation is observed as similar for all the cases raising from the tip of teeth to the base.

time was observed and the values are noted in the table above. The results can be written in brief as:

Deformation : Cast Steel=Cast Iron= Cast Bronze

Equivalent Stress : Cast Steel(7.277)>Cast Iron(3.243)> Cast Bronze(3.027)

Stress Intensity : Cast Steel(8.0498)>Cast Iron(3.553)> Cast Bronze(3.382)

From the results, it is observed that the equivalent stress and the stress intensity is maximum for cast steel and minimum for the cast bronze.

The smaller values of stress intensity assists the part in achieving a longer life.

Hence, from the analysis it can be observed that Cast Bronze is the typical material for the spur gears due to the lower values of both equivalent stress and stress intensity experienced by the material for the same boundary conditions.