Week 2 Railwheel and Track
Aim: The aim of this project is to compare and contrast the results such as Total deformation, equivalent stress and life of Railtrack and wheel results for 100000N and 500000N loads.
Geometry: A cad model of Railtrack and wheel is imported into the Ansys workbench with a structural steel material property.
Model Setup:
Connections: The contact connections of friction with friction coefficient 0.3 between track and wheel (image 1) along with a frictionless contact between wheel and axle (image 2) is defined.
Image 1 Image 2
Joints: Three joints body-ground are defined as below:
Fixed: Two sides of the track are fixed.
Translational: The axle is given a translational joint in the x-direction.
Planar: The outside of the wheel as shown in image 3 was given a planar joint.
Image 3
Mesh: A mesh size of 35mm is given to the model and to three contact surface of track and wheel.
Analysis Settings:
The analysis was set for 5 steps with automatic time step on defined by time and carry over the time step on. The minimum time step of 0.001s and a max time step of 0.1s.
Load:
The joint was given a bearing load of 500000N for the contact surface between axle and wheel.
The translational joint was given a displacement of 500mm increasing from 0 to 5 steps by 100mm.
Results:
The results for both 100KN and 500KN are compared in the below table:
| 100KN load | 500KN load | |
| Total Deformation (mm) | 1001.1 | 1001.1 |
| Equivalent Stress (MPa) | 118.59 | 456.2 |
| Life |
1e6 |
1e6 |
The images for both the load cases are given below:
Image 4: Stress for 100KN Image 5: Stress for 500KN
Image 6: Total Deformation in 100KN Image 7: Total deformation in 500KN
Image 8: Life for 100KN load Image 9: Life for 500KN load
Conclusions:
The user-defined results for total deformation during 500KN was found to be 1001.1 mm similar to that of total deformation during 100KN loading inbuilt result. Image for user-defined deformation is given below:
Image 10: User-defined 500KN load deformation.
*The simulation file has been added below