Week 2 Railwheel and Track

AIM :-

Perform a static structural analysis on the Railwheel and Track setup and

Case 1: Multiply the bearing load by 5 times and compare the results with the load of 100000 N . Compare the Total Deformation, Equivalent stress and the life under both the loads

Case 2: Implement a User defined result and calculate the Total Deformation from this result and check if it is the same as that obtained by the inbuilt result by ANSYS for a load of 100000 N.

CASE SETUP :-

• import the given cad model into ansys workbench

• Rename the components as Running_rail , wheel & Shaft assign structural steel as material.

• properties of material

• Contacts - 1.Frictional contacts were setup between Runnng_rail & Wheel with a friction coefficient of 0.3. To avoid unnecessary complexity select necessary faces that comes into contact during simulation.

2. Friction less contacts were setup between Shaft and Wheel.

• Joints - Total 3 joints are setup between Running_rail , wheel & Shaft w.r.t. ground.

Fixed Joint

Translational Joint

Planarl Joint

• Mesh - generated mesh for total body of components with an element size of 50mm ,to get better results refine contact surfaces of Rail & wheel with an element size of 35mm using Face sizing option

Analytical settings - this analysis setup for 5 steps, this doesn't control time step, but it is only indication of points where boundary conditions change. the time step is auto controlled by minimum ,initial maximum and time steps

• Boundary conditions

Joint displacement

Bearing load with a value of 1e5n

Bearing load with a value of 5e5n

RESULTS FOR LOAD OF 1e5

RESULTS FOR LOAD OF 5e5

CASE -1 comparision of results with load of 1e5 and 5e5

	Total deformation (mm)	Equivalent stress (mpa)	Life (min no.of. cycles)
Load - 1e5	1000.9	95.169	5.6555e5
Load - 5e5	1001	411.12	24834.3

1. comparing the results for both cases, we can observe that there is no change in total deformation

2. Equivalent stress increased with increase in load, so it is obvious that stress in case 2 is higher.

3. The max equivaent stress occures at the rail and wheel contact point.

4. max. Fatigue life is same for both cases but there is a drastic change in min Fatigue life.

5.min. fatigue life is more for case 1.

CASE -2 comparision of user defined total deformation result with deformation of 1e5 Load.

• when an analysis performed displacement occures in 3 directions, X Y and Z
• Total deformation is the overall deformation of the system and it is the sq.root of the summation of the square of X - direction , Y - direction, Z- direction.

expression for total deformation

Total deformation = SQRT (X^2+Y^2+Z^2)

• The obtained user defined deformation result (1000.9) is same as the ansys inbuilt result (1000.9).

Google drive link

https://drive.google.com/file/d/1W0nwHrtMfGgoqhsMFg6vv2KIPoW1Ahuh/view?usp=sharing