Week 8 Worm Gear Challenge

Aim-

For this project, we will have to perform a transient structural analysis on a worm gear assembly. For the academic version, we need to cut the gear by half so as to bring the model within limits. For the challenge, we have to rotate the worm so as to get to almost end of the half cut and get results for Equivalent stress, Equivalent elastic strain and the total deformation in the model.

 

Procedure-

• We have to first start as new project in the ansys workbench Select transient Structural and select the proper material for the cam.
• Here material has been not specified in the project so we will select the material as structural steel.

• Now we have to import the model for that right click on the geometry tab and hit import>>then select the file from saved location and hit ok.
• Now open the space claim and remove the half portion of worm gear to keep this model within acedamic vesrion limit.

• Now open mechanical module to head to connection details.

Contacts-

• Frictionless contact between worm wheel and worm gear
• For this we have to select quarter portion of gear for target elements.

• Here we will give joint connections, as follows.
• First revolute joint body to ground and select the worm gear.

• Second revolute joint body to ground and select the worm wheel.

 

Meshing-

• We have to keep global mesh size as 2mm
• Also in mesh in sizing put select adaptive sizing as No.

Analysis Setting-

• Here we will run stimulation for 15 time steps, refer below setting for all steps.

• Now we have to define a joint load rotation for worm to ground.

Solution Setting-

• Now for stress right click on the solution>>insert>>stresses>>equivalent (von-Mises).
• Now for strain right click on the solution>>insert>>strains>>equivalent elastic (von-Mises).
• Here we have to define total deformation, to do so right click solution>>insert>>deformation>>Total.

Results-

Equivalent Stress-

Equivalent Elastic Strain-

Total Deformation-

Result Tabulation-

Evaluated Result	Min.	Max.
Equivalent Stress (MPa)	2.5496E-4	2149.2
Equivalent Elastic Strain	1.2839E-9	0.01102
Total Deformation (mm)	1.0358	7.2786

 

Animated Result-

Equivalent Stress

Equivalent Elastic Strain

Total Deformation

 

Conclusion-

• From above results we can observe that the stress generated is very high and exceeds the yield strength values so it may fail for structural steel.
• Also total deformation is not higher and observed near worm gear teeths, also strain deformation value is relatively lower.
• So for this type of applications we generally use two different type of materials.