Week 8 - Universal Joint

OBJECTIVE

To perform a transient structural analysis on a double universal joint with a spring using three different materials

Case 1 Structural Steel

Case 2 Stainless Steel

Case 3 Titanium Alloy

The three material must be used on the joint with the spring alone

Create Transient Structural analysis and the 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 assign the structural steel material to all the components

                                                             

Joints 

Fixed Body to Ground Joint   The spring at the end it provided a fixed joint

                                                            

Revolute  Body  to ground Joint

                                                           

Revolute Body to ground Joint

                                                          

Revolute Body To Body Joint  is given to all the pins and gears

                                                 

Mesh     Mesh the whole geometry with 4mm element size and set adaptive sizing to no

                                                    

Analysis Settings  The simulation runs for 5 steps so that number of steps is set as 5

Large deflection set to on auto time stepping to off  defined by time and time step set to 0.1s .In output control set all output to yes.

Joint Rotation   The revolute joint of the gear is provided a rotation of 150 degrees

                                          

Run the simulation and results obtained

Result  The analysis runs successfully and results obtained

Case 1 Structural Steel is assigned for all the parts of the assembly

Total Deformation Max - 38.637mm

                                                            

                                                            

Equivalent Stress Max - 1478.9Mpa

                                                      

                                                     

Equivalent Stress at Joint Max - 5.9309Mpa

                                                    

                                                   

Case 2 

 Stainless Steel  is assigned on the joint with the spring alone

Total Deformation Max - 38.637mm

                                                                                

                                                        

Equivalent Stress Max - 1430.3Mpa

                                               

                                                

Equivalent Stress at Joint Max - 5.9248Mpa

                                                  

                                                 

Case 3 Titanium Alloy is assigned on the joint with the spring alone

Total Deformation Max - 38.637mm

                                                   

                                                   

Equivalent Stress Max - 723.16 MPa

                                                          

                                                         

Equivalent Stress  at Joint Max - 5.8387 Mpa

                                                        

                                                     

CONCLUSION

• Structural Steel  experience maximu stress due to the highest youngs modulus .Stress is directly Proportional to youngs modulus. So the maximum value is in structural steel and the minimum value is in titanium alloy 
• Total Deformation is the same in all the cases due to the equal amount of rotation given