A Report

On

Thermal Analysis of Railway Wagon Brake Shoe

Prepared in partial fulfillment of the

Computer Aided Design Project

Course MEC382

At

Birla Institute of Technology & Science, Pilani

Goa Campus

Goa

April 2009

A Report

On

Thermal Analysis of Railway Wagon Brake Shoe

By

Sunil Kumar Tiwari 2006A4PS355G

Ravi KumarAgarwal 2006A4PS390G

Ashwin Balasubramanian 2006A4PS077G

Vihal Trivedi 2006A4PS338G

Prepared in partial fulfillment of the

Computer Aided Design Project

Course MEC382

At

Birla Institute of Technology & Science, Pilani

Goa Campus

Goa

April 2009

Acknowledgements

No project or research is done in a single day by a single person but it is a result of long

experimentation and observation where the required environment consisting of many people plays a

vital role in initializing and completing a work.

We are really thankful to our Course Instructor Dr D M Kulkarni for guiding and inspiring us at every

step and helping us obtain the required analysis conditions. We would also like to thank him for the

crucial CAD concepts that helped us a long way in this project. .

Introduction-

The aim of this project is to analyze the temperature variation of the railway brake shoe

with respect to time. When brakes are applied there is contact between wheel and brake shoe.

This causes friction due to which there is rise in temperature. We considered the transient

condition and we assumed initial conditions on temperature and also final temperature. We then

did analysis on ANSYS using above assumptions and we found temperature gradient and heat

flux diagram. The units we used are in British units. Initial temperature is 77deg. F (25deg.C) on

all the areas of brake-shoe. Final temperature is 700 deg. F. (371.1 deg. C) is on the contacting

surface only. All the graphs and diagrams are made as per analysis and calculations are done

accordingly. The density and heat conduction and specific heat capacity of the material at

various temperatures were took from manual.

Modeling Modeling was done in Pro-E 2.0 and Analysis was done in Ansys 10 : Steps in Modeling:

Element and Material Properties Material Composite (Patent no. 4313869)

Temperature

(F)

Density

(lb/ft3)

Conductivity

(Btu/lb-ft-F)

Specific Heat(Btu/lb-F)

70

200

300

400

500

600

700

492.48

492.48

492.48

492.48

492.48

492.48

492.48

8.35

8.9

9.35

9.8

10.35

10.8

11.35

0.113

0.117

0.119

0.122

0.125

0.129

0.132

Film Coefficient of air at 77 F= 8.806 Btu/hour-ft2-F

Meshing The Mesh contained 1872 nodes

The Mesh contained 7842 elements

Meshed Model

Solution Phase: Assigning Loads and Solving Types of Constraint: At the bottom surface we applied the load of constant Temperature 700 F.

2. Now we applied convection constraint on all other surface of body as they are in contact with

ambient. Ambient temperature is 77 F and Film Coefficient of Ambient = 8.806 Btu/hour-ft2-F

3. Now we defined the analysis type to ‘Transient’.

Solution:-

Flux Result:

Animation:-

Then animate the data.

Utility Menu > PlotCtrls > Animate > Over Time...

Fill in the following window as shown (20 frames, 0 - 2000 Time Range, Auto

contour scaling

OFF, DOF solution > TEMP)

RESULT:-

The temperature variation of the brake shoe at its different surfaces was studied

and for their variation with respect to time an animation was created. We also

studied the heat flux variation ,plotted its graph and animation.

From the observation its clear that outer surface is at room temperature so

between 77deg. F (25deg.C) and 700 deg. F. (371.1 deg. C)temperature, this material is

suitable for making the brake shoe.