Squealing occurrence of worn brake pads to foreign particles embedment into the friction layers

The disc brake squeal is a very annoying sound and a source of considerable discomfort that leads to customer dissatisfaction. There are various possible mechanisms that could trigger brake squeal generation either from a structural dynamics or tribological point of view. Unlike drum brake design, t...

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Main Author:	Mat Lazim, Ahmad Razimi
Format:	Thesis
Language:	English
Published:	2017
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/79218/1/AhmadRazimiMatLazimPFKM2017.pdf
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id	my-utm-ep.79218
record_format	uketd_dc
spelling	my-utm-ep.792182018-10-14T08:39:32Z Squealing occurrence of worn brake pads to foreign particles embedment into the friction layers 2017 Mat Lazim, Ahmad Razimi TJ Mechanical engineering and machinery The disc brake squeal is a very annoying sound and a source of considerable discomfort that leads to customer dissatisfaction. There are various possible mechanisms that could trigger brake squeal generation either from a structural dynamics or tribological point of view. Unlike drum brake design, the disc brake assembly, particularly the disc and the pads are exposed to any unwanted road particle, wear debris and water spray. Their presence into the disc and pad interfaces may create dynamic and physics phenomena induced by friction surface changes which lead to the brake noise and vibration issues. Thus, the objective of this research is to investigate a characterization of the worn surface of squealing brake friction material with the effect of different sizes of foreign particles using laboratory scale brake test rig. The correlation between squeal generation and tribological characteristics of the pad including surface topography, surface roughness, wear, element composition and friction coefﬁcient are established by using squeal index and qualitative analysis. The foreign particles (silica sand and road sand particles) with the sizes of 100-150, 200-300 and 300-400 um are introduced into the brake disc and pad interfaces. The sensitivity of sand particles in producing squeal noise is also examined at different brake pressures, disc temperatures and speeds. The experimental results show that both sand particles have a significant effect on the brake squeal occurrences. The tribological properties reveal that squeal is more affected by smaller sand particle size. The micrometric particles act as punctual contact surfaces generating more wear debris which are accumulated and compacted inducing a reduction of the friction level. However, the biggest particle size damages the pad surface, reduces the real contact surface and decreases the friction coefﬁcient, yet generates more wear lost. It was found that foreign particles play an important role in reducing the squeal level on the pad surface as well as increasing the value of the squeal index number. 2017 Thesis http://eprints.utm.my/id/eprint/79218/ http://eprints.utm.my/id/eprint/79218/1/AhmadRazimiMatLazimPFKM2017.pdf application/pdf en public phd doctoral Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Mat Lazim, Ahmad Razimi Squealing occurrence of worn brake pads to foreign particles embedment into the friction layers
description	The disc brake squeal is a very annoying sound and a source of considerable discomfort that leads to customer dissatisfaction. There are various possible mechanisms that could trigger brake squeal generation either from a structural dynamics or tribological point of view. Unlike drum brake design, the disc brake assembly, particularly the disc and the pads are exposed to any unwanted road particle, wear debris and water spray. Their presence into the disc and pad interfaces may create dynamic and physics phenomena induced by friction surface changes which lead to the brake noise and vibration issues. Thus, the objective of this research is to investigate a characterization of the worn surface of squealing brake friction material with the effect of different sizes of foreign particles using laboratory scale brake test rig. The correlation between squeal generation and tribological characteristics of the pad including surface topography, surface roughness, wear, element composition and friction coefﬁcient are established by using squeal index and qualitative analysis. The foreign particles (silica sand and road sand particles) with the sizes of 100-150, 200-300 and 300-400 um are introduced into the brake disc and pad interfaces. The sensitivity of sand particles in producing squeal noise is also examined at different brake pressures, disc temperatures and speeds. The experimental results show that both sand particles have a significant effect on the brake squeal occurrences. The tribological properties reveal that squeal is more affected by smaller sand particle size. The micrometric particles act as punctual contact surfaces generating more wear debris which are accumulated and compacted inducing a reduction of the friction level. However, the biggest particle size damages the pad surface, reduces the real contact surface and decreases the friction coefﬁcient, yet generates more wear lost. It was found that foreign particles play an important role in reducing the squeal level on the pad surface as well as increasing the value of the squeal index number.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Mat Lazim, Ahmad Razimi
author_facet	Mat Lazim, Ahmad Razimi
author_sort	Mat Lazim, Ahmad Razimi
title	Squealing occurrence of worn brake pads to foreign particles embedment into the friction layers
title_short	Squealing occurrence of worn brake pads to foreign particles embedment into the friction layers
title_full	Squealing occurrence of worn brake pads to foreign particles embedment into the friction layers
title_fullStr	Squealing occurrence of worn brake pads to foreign particles embedment into the friction layers
title_full_unstemmed	Squealing occurrence of worn brake pads to foreign particles embedment into the friction layers
title_sort	squealing occurrence of worn brake pads to foreign particles embedment into the friction layers
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2017
url	http://eprints.utm.my/id/eprint/79218/1/AhmadRazimiMatLazimPFKM2017.pdf
_version_	1747818174893522944

Squealing occurrence of worn brake pads to foreign particles embedment into the friction layers

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