Wear induced failure of automotive disc brakes: A case study

Mohammadnejad, Ali; Bahrami, Abbas; Goli, Majid; Dehbashi Nia, Hossein; Taheri, P.

doi:10.3390/ma12244214

Wear induced failure of automotive disc brakes

Title

Wear induced failure of automotive disc brakes: A case study

Author

Mohammadnejad, Ali (Isfahan University of Technology)
Bahrami, Abbas (Isfahan University of Technology)
Goli, Majid (Isfahan University of Technology)
Dehbashi Nia, Hossein (Isfahan University of Technology)
Taheri, P. (TU Delft (OLD) MSE-6)

Date

2019

Abstract

This paper investigated a failure in a ventilated disc brake in an automobile. The failed brake disc had been in service for approximately 10 years. The observed failure was in the form of radial cracks that appeared to have initiated at the outer edge of the disc brake. The cracks were rather straight with no branching. Optical microscope, scanning electron microscope (SEM), and energy dispersive X-ray spectroscopy (EDS) were used to study the microstructure of the failed disc. Vickers microhardness test was also used to evaluate the hardness of the samples. Results showed that the root cause of crack formation, in this case, was related to the excessive wear in the brake disc. Different wear mechanisms, namely abrasive and adhesive wear, were recognized in the failed specimen. Moreover, the worn surface in some areas was covered with fine oxide particles. These particles appeared to have a significant contribution toward abrasion. To further understand the wear mechanisms, pin-on-disc experiments were also conducted on the samples. Results of the pin-on-disc experiments were compared and correlated to the results obtained from the failed brake disc.

Subject

failure
disc brake
automobile
wear

To reference this document use:

http://resolver.tudelft.nl/uuid:43d6451d-935c-4f7f-9fdd-b1b902e73278

DOI

https://doi.org/10.3390/ma12244214

ISSN

1996-1944

Source

Materials, 12 (24)

Part of collection

Institutional Repository