Week 8 - Universal Joint

REPORT

DOUBLE UNIVERSAL JOINT WITH A SPRING

OBJECTIVE

To perform transient structural analysis on a double universal joint with a spring using 3 different materials.

PROCEDURE

CASE 1

Loaded the model in mechanical GUI.

Rotate the gear part and the motion gets transferred through pin joint and coil the spring.

Deleted all the contacts since we do not require it.

The material using is structural steel and the properties are given below,

JOINTS

Body to ground-Fixed joint is applied to the spring.

Body to ground-Revolute joint is applied to gear shaft.

Body to ground-Revolute joint is applied to spring shaft.

Body to body-Revolute joint is applied to all 8 pin joints.

ANALYSIS SETTING

Total 5 steps and the setting are given below,

The gear is rotated to 150 degrees.

A 4mm mesh is used for this analysis.

RESULTS

THE TOTAL DEFORMATION

THE EQUIVALENT STRESS

CASE 2

Here the material used for the joint for the spring is stainless steel. All other procedures are same as case 1. The properties of the stainless steel is shown below,

The total deformation and equivalent stress is shown below,

CASE 3

Here the material used for the joint for the spring is titanium alloy. All other procedures are same as case 1. The properties of the titanium alloy is given below,

The total deformation and equivalent stress is shown below,

CONCLUSION

Comparing the total deformation (max)

Case 1 = 38.647 mm

Case 2 = 38.637 mm

Case 3 = 38.637 mm

Comparing the equivalent stress (max)

Case 1 = 1473 MPa

Case 2 = 1425 MPa

Case 3 = 721.52 MPa

The total deformation is same for all 3 cases.

The maximum equivalent stress is occurred in case 1 where structural steel as spring joint and least occurred in case 3 where titanium alloy as spring joint.