Week 2 Railwheel and Track

AIM:

• To perform structural analysis on Railwheel track and to find the equivalent stress, Total deformation, and life under give load cases and to find the deformation using an expression.

Procedure:

• Open ansys workbench and drag and drop a static structural standalone system using the mouse.

• Double click on engineering data and add the materials required for the analysis.
• Now import the geometry of the rail wheel track.

• Now create contacts and joints required in the analysis.
• Between the wheel and the track create the frictional type of contact with a frictional coefficient value of 0.3.

• Between the wheel and the shaft create a frictionless type of contact.

• Now create joints to produce the required motion and mechanism.
• Create a translation joint for the shaft.

• Create a fixed joint for the track.

• Create a planar joint for the wheel face to make sure that the face remains in the respective plane throughout the simulation.

• Now go to mesh menu and inset face sizing with element size as 35mm.

• Now mesh the entire assembly with an element size of 35mm.

• After creating proper joints and contacts now change analysis settings change number load steps to 5 and for load step 1 keep time-stepping as program-controlled.

• For load steps 2 to 5 change the analysis settings as below.

• No apply bearing load and joint displacement for the translation joint in tabular format.

• Now insert the required results under solution.

• Now Simulate the model to obtain the results.

RESULTS:

• TOTAL DEFORMATION.FOR BEARING LOAD OF 100000N.

• EQUIVALENT STRESS FOR BEARING LOAD OF 100000N.

• EQUIVALENT ELASTIC STRAIN FOR BEARING LOAD OF 100000N.

• FATIGUE LIFE FOR BEARING LOAD OF 100000N.

• Now we have to perform the simulation for a bearing load of 5times the given bearing load that is for 50000N.
• As the geometry, model, setup and analysis setting are the same for the simulation of the model under a bearing load of 500000N so we can perform a parametric study.
• Now create a parameter set for bearing load for all the results required.

• Close ansys mechanical and we can able to see the parameter set created for the simulation.

• Now open the parameter set by double-clicking on the parameter set and inset the load value which is 5times the bearing load i.e., 500000N.

• After inserting a load value of 500000N update the selected design point to obtain results.

CASE:1 COMPARISON OF RESULTS FOR BEARING LOADS OF 100000N AND 500000N

SL.NO	BEARING LOAD(N)	LIFE	TOTAL DEFORMATION	EQUIVALENT STRESS(MPa)	ELASTIC STRAIN
1	100000N	1.0E+006	999.37	118.1	0.00067054
2	500000N	1867.7	999.43	452.76	0.0025823

• From the above results for which the bearing load is 100000N and 500000N, we can say that the model which is subjected to a high amount of bearing load undergoes similar deformation, it has less fatigue life and produces more amount of stress and strains.

CASE:2 USER DEFINED DEFORMATION:

• To find the user-defined result insert the user-defined result under the solution tab. To obtain any user-defined results we have to create an expression for the results.
• For total deformation, the expression for the user-defined result is the square root of (Ux^2+Uy^2+Uz^2).

COMPARISION OF USER-DEFINED RESULT AND RESULT OBTAINED FROM SIMULATION:

• The total deformation obtained from the simulation results and from the user-defined expression is the same i.e., 999.73mm.

CONCLUSIONS:

• The simulation of RAIL-WHEEL-TRACK for the given cases have been performed successfully.
• The results for all the cases are obtained and compared.
• The user-defined results by using ansys worksheet are calculated successfully.

ANIMATION FILES:

EQUIVALENT STRESS: https://drive.google.com/file/d/1z3MDqxPMJnnIy22RvW0hvH_9RElEgpwC/view?usp=sharing

ELASTIC STRAIN: https://drive.google.com/file/d/1OqV2ao3qgbDgNwKo8WBEomhagLjIfQb8/view?usp=sharing

TOTAL DEFORMATION: https://drive.google.com/file/d/1Q5ngyqGHeybyDUhrUUnx4NY5_nQr6ibk/view?usp=sharing

USER-DEFINED RESULT: https://drive.google.com/file/d/13eyplYHstdcj6eHCM1UHBaxuLmP86aLF/view?usp=sharing

RESULT FILES:

EQUIVALENT STRESS: https://drive.google.com/file/d/1dpubV1kAFx4xrtYsQicNKmUR4N4NZww3/view?usp=sharing

ELASTIC STRAIN: https://drive.google.com/file/d/14sXtKKy-ROSIQVLm-cVP-ZVtF3v3zUlR/view?usp=sharing

TOTAL DEFORMATION: https://drive.google.com/file/d/14sXtKKy-ROSIQVLm-cVP-ZVtF3v3zUlR/view?usp=sharing

USER-DEFINED RESULT: https://drive.google.com/file/d/1-FREXC5DDzXMchB-5ZEEIR-CNIDnao9z/view?usp=sharing

FATIGUE LIFE: https://drive.google.com/file/d/19A4QYZU6VrQcYzChe3mF_F01noTuNO06/view?usp=sharing