Simulation of Tension and Torsion test using ANSYS Workbench

OBJECTIVE:

To perform the tensile and torsion test on the specimen using ANSYS Workbench. The following objectives are to be satisfied.

1. To displace one end of the specimen to 18 mm while keeping the other end fixed for tension test.

2. To displace one end of the specimen to an angle of 1200 degrees while keeping the other end fixed for the torsion test.

PROCEDURE FOR CASE SETUP:

For Tensile Test:

1. Open ANSYS >> Drag and drop Explicit Dynamics in the project schematic window.

2. Go to engineering data for defining the materials given in the problem. Select STEEL 1006 from general materials from the material library. The selected material is shown in the figure below.

3. Select the model tab to establish the reference coordinates, meshing, contact definitions, and analysis settings definition. Rename the parts according to convenience. Assign the parts steel 1006 material.

4. Define the coordinate references as shown in the figure below.

5. For meshing, give a patch conforming method to the specimen by giving element type as tetrahedrons. Insert a face sizing with an element size of 3 mm. For defining the sphere of influence select the reference coordinate system defined in step 4. It is explained in the figure below.

The final meshed model is shown in the figure below.

The mesh metrics are shown in the figure below.

6. Go to analysis settings. The number of steps defined for this analysis is 1. The definition is shown in the figure below.

7. The boundary condition is explained in the following figures.

8. The output requests for equivalent stress, total deformation, and the user-defined result of temperature are requested.

9. From the analysis settings, hit on solve to start the simulation. 

For Torsion Test:

1. Steps 1-3 are repeated as that of the case setup of the tensile test.

2. Create a reference coordinate system as shown in the figure below.

3. For meshing, give a patch conforming method to the specimen by giving element type as tetrahedrons. The meshing remains the same as that of the tensile test case setup. In addition to it, define a face sizing in the centre of the specimen using a sphere of influence option with an element size of 1 mm. The neighbouring faces are given a mesh size of 1.5 mm using face sizing option.

The final meshed model is shown in the figure below.

The mesh metrics are shown in the figure below.

4. The analysis settings remains the same as that of the tensile test case setup. The boundary conditions are shown in the figure below.

5. The output requests for equivalent stress, total deformation, and the user-defined result of temperature are requested.

6. From the analysis settings, hit on solve to start the simulation. 

RESULTS AND DISCUSSION:

For Tensile Test:

1. The total deformation is shown in the figure below.

2. The equivalent stress is shown in the figure below.

3. The temperature of the specimen is found by defining the user-defined result and it is shown below.

For Torsion Test:

1. The total deformation is shown in the figure below.

2. The equivalent stress is shown in the figure below.

3. The temperature of the specimen is found by defining the user-defined result and it is shown below.

ANIMATION FILES:

1. The equivalent stress animation for the two tests are shown below.

2. The total deformation are shown in the figures below.

3. The temperature obtained are shown in the figures below.

CONCLUSION:

From the simulation, it can be seen that for both cases the solution converged without any errors.

The output parameters are tabulated below.

From the above table, it can be seen that magnitude of total deformation is slightly higher for the torsion test with a value of 19.408 mm. The defined displacement is obtained for the tensile test with a value of 18.004 mm. 

The equivalent stress observed in torsion test is higher with a value of660.22 MPa. The value of equivalent stress observed for the tensile test is 637.54 MPa. It is to be noted that the equivalent stress observed in the buckle is higher when the buckle moves towards the clip.

The temperature results observed for torsion test is nearly double when compared to tensile test with a value of 468.05 degree Celsius. The temperature obtained in the tensile test is 267.35 degree Celsius.

Therefore, it can be concluded that the total deformation for the two tests approximately remains the same. The equivalent stress observed is higher for the torsion test. The temperature obtained is higher in the case of torsion test. Hence, all the objectives are satisfied.