Stress Analysis of Double Universal Joint using ANSYS Workbench

Objectives: To perform a Stress analysis of Double Universal Joint

  • Geometrical Design:

We have 3D Geometry of Double Universal joined here which is connected with a Helical Spring.

This is how geometry looks like;

 

  • Material Properties:

For this project we will use 3 different materials such as Structural Steel, Stainless Steel and Titanium Alloys, each material having different mechanical properties which are shown below;

 

  • Problem Statement:

A Double Universal joint is taken in consideration for this analysis, One Helical Spring is attached with Universal Joint which is kept fixed and one joint is applied with rotary motion. At the end we will capture various aspects of stress analysis such as Total Deformation, Equivalent Elastic Stress and Equivalent Strain.

 

  • Mesh Criterion:

Type of Element: Automatic Method (Tet & Hex Mesh)

Size of Element: 4 mm

This is how model looks like after meshing done;

 

1) Mesh Model

 

2) Element Quality

 

  • Boundary Conditions:

Various 3 kinds of Joints (In Contact) will be applied to this model. In First Helical Spring one end is kept Fixed in second joint; both yokes are applied with rotation and in third joint Spider is applied with revolute joint.

This is how model looks like when joints are applied to it,

 

  • Fixed Joint (Spring)

 

  • Revolute Joint (Yoke)

 

  • Revolute Joint (Spider)

 

 

  • Loading & Analysis Settings:

Whole analysis is carried out in 5 Steps; Large Deflection is kept ON for this analysis.

Universal Joint Yoke which is connected to Engine Output is applied with Rotational Velocity in 5 different steps.

  • Analysis Settings:

 

  • Loading:

 

  • Post - Processing:

We have 3 Different Materials for this analysis so we will carry out this project with these materials and will compare outputs at the end.

 

Case 1: (Material - Structural Steel)

 

  • Total Deformation

 

  • Equivalent Elastic Strain

 

  • Equivalent Stress

 

  • Equivalent Elastic Strain for Yoke Loaded with Spring

 

  • Equivalent Stress for Yoke Loaded with Spring

 

 

Case 2: (Material - Titanium Alloy)

 

  • Total Deformation

 

  • Equivalent Elastic Strain

 

  • Equivalent Stress

 

  • Equivalent Elastic Strain for Yoke Loaded with Spring

 

  • Equivalent Stress for Yoke Loaded with Spring

 

 

Case 3: (Material – Stainless Steel)

  • Total Deformation

 

  • Equivalent Elastic Strain

 

  • Equivalent Stress

 

  • Equivalent Elastic Strain for Yoke Loaded with Spring

 

  • Equivalent Stress for Yoke Loaded with Spring

 

 

Click here to see Animation of this Project;

Universal Joint FEA || ANSYS Workbench

 

Post Process Results Summary;

  • Results and Conclusion:

1) Total Deformmation is almost same in all cases.

2) Equivalent Elastic Strain values also similar in all cases, a slight variation can be seen.

3) The value of Equivalent Stress is higher in Structural Steel (Max 1591.20 Mpa)

 

When we see stress of Structural Steel it is higher than its Ultimate Tensile Strength, for Titanium Alloy the max stress value stays in limits, for Stainless Steel Max stress values are also higher than Ultimate Stress values. For this kind of Parts either Stainless Steel or Titanium Alloy can be best choice. Other grades of Stainless Steels are widely used for Universal Joints.


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