Automobile friction materials: a test instrument and technique for determining dynamic mechanical properties in relation to brake squeal

This study is primarily concerned with the problem of break-squeal in disc brakes, using moulded organic disc pads. Moulded organic friction materials are complex composites and due to this complexity it was thought that they are unlikely to be of uniform composition. Variation in composition would...

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Main Author: Rushton, Roger D.
Published: Aston University 1973
Subjects:
540
Online Access:http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.471194
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spelling ndltd-bl.uk-oai-ethos.bl.uk-4711942017-04-20T03:25:34ZAutomobile friction materials: a test instrument and technique for determining dynamic mechanical properties in relation to brake squealRushton, Roger D.1973This study is primarily concerned with the problem of break-squeal in disc brakes, using moulded organic disc pads. Moulded organic friction materials are complex composites and due to this complexity it was thought that they are unlikely to be of uniform composition. Variation in composition would under certain conditions of the braking system, cause slight changes in its vibrational characteristics thus causing resonance in the high audio-frequency range. Dynamic mechanical propertes appear the most likely parameters to be related to a given composition's tendency to promote squeal. Since it was necessary to test under service conditions a review was made of all the available commercial test instruments but as none were suitable it was necessary to design and develop a new instrument. The final instrument design, based on longitudinal resonance, enabled modulus and damping to be determined over a wide range of temperatures and frequencies. This apparatus has commercial value since it is not restricted to friction material testing. Both used and unused pads were tested and although the cause of brake squeal was not definitely established, the results enabled formulation of a tentative theory of the possible conditions for brake squeal. The presence of a temperature of minimum damping was indicated which may be of use to braking design engineers. Some auxilIary testing was also performed to establish the effect of water, oil and brake fluid and also to determine the effect of the various components of friction materials.540ChemistryAston Universityhttp://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.471194http://publications.aston.ac.uk/11638/Electronic Thesis or Dissertation
collection NDLTD
sources NDLTD
topic 540
Chemistry
spellingShingle 540
Chemistry
Rushton, Roger D.
Automobile friction materials: a test instrument and technique for determining dynamic mechanical properties in relation to brake squeal
description This study is primarily concerned with the problem of break-squeal in disc brakes, using moulded organic disc pads. Moulded organic friction materials are complex composites and due to this complexity it was thought that they are unlikely to be of uniform composition. Variation in composition would under certain conditions of the braking system, cause slight changes in its vibrational characteristics thus causing resonance in the high audio-frequency range. Dynamic mechanical propertes appear the most likely parameters to be related to a given composition's tendency to promote squeal. Since it was necessary to test under service conditions a review was made of all the available commercial test instruments but as none were suitable it was necessary to design and develop a new instrument. The final instrument design, based on longitudinal resonance, enabled modulus and damping to be determined over a wide range of temperatures and frequencies. This apparatus has commercial value since it is not restricted to friction material testing. Both used and unused pads were tested and although the cause of brake squeal was not definitely established, the results enabled formulation of a tentative theory of the possible conditions for brake squeal. The presence of a temperature of minimum damping was indicated which may be of use to braking design engineers. Some auxilIary testing was also performed to establish the effect of water, oil and brake fluid and also to determine the effect of the various components of friction materials.
author Rushton, Roger D.
author_facet Rushton, Roger D.
author_sort Rushton, Roger D.
title Automobile friction materials: a test instrument and technique for determining dynamic mechanical properties in relation to brake squeal
title_short Automobile friction materials: a test instrument and technique for determining dynamic mechanical properties in relation to brake squeal
title_full Automobile friction materials: a test instrument and technique for determining dynamic mechanical properties in relation to brake squeal
title_fullStr Automobile friction materials: a test instrument and technique for determining dynamic mechanical properties in relation to brake squeal
title_full_unstemmed Automobile friction materials: a test instrument and technique for determining dynamic mechanical properties in relation to brake squeal
title_sort automobile friction materials: a test instrument and technique for determining dynamic mechanical properties in relation to brake squeal
publisher Aston University
publishDate 1973
url http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.471194
work_keys_str_mv AT rushtonrogerd automobilefrictionmaterialsatestinstrumentandtechniquefordeterminingdynamicmechanicalpropertiesinrelationtobrakesqueal
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