Simulating Tension and Torsion test of a specimen in Ansys using Explicit Dynamics module
OBJECTIVE
To perform the tension and torsion test on the specimen provided
Tension test - displace one end of the specimen to 18mm while keeping the other fixed.
Torsion test - displace one end of the specimen to an angle of 1200 degree.
The CAD model is imported using spaceclaim and checked for any geometry errors.
Simulation setup
Material Assignment
The workpiece is assigned with the material STEEL 1006 which is in Explicit material library.
Coordinate system definition
Three cartesian coordinate systems are defined in the tension test specimen. One in centre and two on either side as given below.
For the torsion test, in the centre alone instead of cartesian coordinate cylindrical coordinate is used
Mesh Generation
Specimen for Tension - The element type is given as tetrahedrons. Face sizing of 3mm is given within a sphere of influence of radius 22.0 mm
Specimen for Torsion - The element type is given as tetrahedrons.Face sizing of 3mm is given within a sphere of influence of radius 22.0 mm
In order to calculate accurate results in torsion affected area, another face sizing is given for 1.5mm on either sides of the centre.
In the centre a third sphere of influence of radius 22.0 mm is defined with an element size of 1mm
Analysis settings
The analysis settings is defined with step end time of 1.e-003
The step control and solver settings are given below.
For Tension test one end is fixed and another end is given a displacement of 18mm
For Torsion test also one end is fixed and on another end an angle displacement of 1200° (degree) is given in Y-axis
Results
Tension test results
Total Deformation
Equivalent Stress
Temperature
It is seen that during necking process the temperature of the layers in the necking region increases to 267.35 °C
Torsion test results
Total Deformation
Equivalent Stress
Temperature
In the torsion region the specimen completely breaks and small particles are scattered. In this area due to torsional stress the temperature increases to 466.35 °C
Conclusion
The equivalent stress in torsional loading is ( 666.97 MPa) which is more than that of in tensile loading.
The maximum total deformation is more in torsional loading .
The molecular dislocations which dissipate the heat is the reason for temperature generated in these processes.
| Maximum Total Deformation | Maximum Equivalent Elastic Stress | Maximum Temperature Generated | |
| Tensile test | 18.004 mm | 637.54 MPa | 267.35 °C |
| Torsion test | 19.394 mm | 666.97 MPa | 466.35 °C |