3D investigation of thermal stresses in a locomotive ventilated brake disc based on a conjugate thermo-fluid coupling boundary conditions

• Published in: International communications in heat and mass transfer Vol. 49; pp. 104 - 109
• Main Authors: Ghadimi, B., Sajedi, R., Kowsary, F.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.12.2013; Elsevier
• Subjects: Applied sciences; Brake disc; Brake disks; Brakes; Braking; Discs; Disks; Drives; Exact sciences and technology; Ground, air and sea transportation, marine construction; Locomotive; Locomotives; Mechanical engineering. Machine design; Railway transportation and traffic; Shafts, couplings, clutches, brakes; Thermal stress; Thermal stresses; Three dimensional; Thermal stress; Locomotive; Brake disc; Temperature distribution; Disk brake; Braking; Test facility; Rail vehicle; Experimental study; Train; Heat transfer
• ISSN: 0735-1933; 1879-0178
• DOI: 10.1016/j.icheatmasstransfer.2013.10.009

The frictional heat generated during braking application can cause several negative effects on the brake system such as brake fade, premature wear, thermal cracks and disk thickness variation. It is then important to determine with precision, the temperature field and thermal stresses of the brake disc. In this study, thermal stress analyses on a ventilated locomotive wheel-mounted brake disc R920K with a three-dimensional model for two cases (the first case considers braking to a standstill; the second case considers braking on a hill and maintaining a constant speed) were investigated. The rate of braking heat generation is calculated using the assumption of uniform pressure distribution at the contact area. Then, thermal stress analyses for each case were performed. Finally, we have found that the maximum thermal stresses occur in the case with an emergency braking in the beginning of the braking process.