Week 8 Worm Gear Challenge

OBJECTIVE

To perform a transient strucrural analysis on a worm gear assembly and determine the total deformation , Equivalent stress and Equivalent Elastic Strain developed in the model

PRODECURE

Create Transient Structural analysis and in engineering data select the material structural steel 

Structural Steel

Import the geometry and check in Spaceclaim for any irregularties

Then open Ansys mechanical and rename the component as worm and gear then assign the structural steel material to all components

                                                      

Contact   One contact created as frictionless contact

Frictionless Worm to Gear

 

                                      

Joints 

Revolute Ground to gear

                                                               

Revolute Ground to Worm

                                                               

Mesh   Mesh the whole geometry with 2.5mm element size

                                                           

Analysis Setting   The simulation for 30 steps. So the number of steps is set as 30

Large deflection set to on weak springs set to program controlled auto time stepping to on defined by time.Intial time step set to 0.2s Minimum time step set to 0.2s and maximum time step set to 0.5s .For second to thirty step set carry over time step to on .In output control set all output to yes.

Joint Rotation   The revolute joint on the worm is provided a rotation of 1500 degrees

                                                 

Run the simulation and results obtained

Result  The analysis runs successfully and results obtained

Total Deformation Max-14.395mm

                                             

                                              

Equivalent Stress Max - 1619.8Mpa

                                                   

                                                  

Equivalent Strain Max - 0.008242mm/mm

                                                 

                                                 

Total Deformation

                                                    

CONCLUSION

• The maximum stress occurs at point of contact
• The maximum defornation are basically measurements of displacement of a worm gear assembly with respect to its intial position
• The maximum stress and strain is observed at the length root of gear