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Grey Cast Iron microstructure and brake discs squeal
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
2021 (English)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Squeal noise generated by the brake disc is a phenomenon that negatively affects the comfort of vehicle passengers. At vibrations of certain frequency, the brake disc can enter in resonance and act as a loudspeaker. The ability to produce brake discs with defined eigenfrequency is therefore crucial for controlling the brake system squeal.Traditionally, gray cast iron (GCI) is the preferred material for automotive brake discs. Since the brake discs are produced in a casting process, variations of the microstructures of the material between discs are inevitable. This causes a significant number of discs don’t fulfil the eigenfrequency requirements and are scraped. There is therefore a need to better understand the mechanism behind the variation in eigenfrequency of GCI brake discs.  This work has investigated how the shape, size and distribution of the cast iron microstructure elements affect the tendency to produce squeal. Data from several optical and scanning electron microscopes images as well as hardness measurements have been analyzed to determine relations between microstructure elements such as graphite, pearlite and MnS and the brake disc eigenfrequency.This investigation showed a relation between eigenfrequency and microstructure parameters number of MnS particles/mm2 and pearlite interlamellar spacing. Those two parameters are usable to predict the eigenfrequency of brake discs.  

Place, publisher, year, edition, pages
2021. , p. 33
Keywords [en]
Brake Disc, Gray Cast Iron, GCI, Eigenfrequency, Natural Frequency, Squeal
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:hj:diva-51689ISRN: JU-JTH-PRU-2-20210234OAI: oai:DiVA.org:hj-51689DiVA, id: diva2:1522190
External cooperation
Automotive Components Floby AB
Subject / course
JTH, Product Development
Presentation
2021-01-13, Zoom, 10:00 (English)
Supervisors
Examiners
Available from: 2021-01-29 Created: 2021-01-25 Last updated: 2021-01-29Bibliographically approved

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf