Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • 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
A STUDY ON THE LOAD LEVEL INFLUENCE ON PARTICULATE MATTER EMISSIONS FROM THE SLIDING CONTACT BETWEEN A LOW STEEL FRICTION MATERIAL AND CAST IRON
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Tribologi.ORCID iD: 0000-0003-3345-5469
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Tribologi.ORCID iD: 0000-0003-2489-0688
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Tribologi.
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).ORCID iD: 0000-0003-4461-0209
Show others and affiliations
2015 (English)In: Eurobrake 2015, Dresden, 2015Conference paper (Refereed)
Abstract [en]

In 2013 the road transport contribution to PM10 and PM2.5 emissions in the EU region counted for 11% and 16% respectively of the total emission. Related to these road transport emissions, the non-exhaust fraction equals almost the 50% of the exhaust one. A major contributor to the non-exhaust fraction is the wear particles generated from disc brakes.

The purpose of this paper is to investigate how different load levels, i.e. contact pressures, can affect the particle concentration, the particle size distribution as well as the temperature distribution of a typical pad to rotor material combination (low-steel pad material and cast iron disc) found in European braking system.

Tests were conducted in a pin-on-disc machine, specially designed for airborne particulate research. A clean chamber technique was used ensuring that measured airborne particulates were only generated from the sliding contact in the pin-on-disc machine. In addition, an insulating plate placed between the disc and the rotating base allows the system to reach up to 350°C, without using any external heating source. The same constant sliding speed was used for all tests (1.3 m/s) ensuring the same sliding distance with the specific test time of 3h. The testing time was chosen to get a long enough steady state periods. The load was applied to the contacting pairs with dead weights varying from 1 kg to 7 kg giving an average contact pressure range of 0.29 MPa to 1.95 MPa. The concentration and the size distribution were measured using an Electrical Low Pressure Impactor (Dekati ®ELPI+) covering a size range from 6 nm to 10 μm. The frictional heating was measured using thermocouples placed 3 mm from the contact surface in both pin and disc. Also the friction coefficient and the wear rate were determined using a load cell measuring the frictional load and a LVDT measuring the wear depth change.

The results show a stable stationary particle generation for the low loads compared to a more transient response with short periods of high concentration levels for the higher loads. This gives evidence of a temperature limit in the production of airborne particulates generated from disc brake material combinations. Above this temperature limit around 200°C a sharp increase in the total concentration number can be detected. Future studies will be devoted to a study of different pad to rotor material combinations.

Place, publisher, year, edition, pages
Dresden, 2015.
Keyword [en]
Particulate matter, Pin-on-disc, Friction material, Wear, Disc brakes
National Category
Engineering and Technology
Research subject
Machine Design; Engineering Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-208686ISBN: 978-0-9572076-6-0 (electronic)OAI: oai:DiVA.org:kth-208686DiVA: diva2:1107894
Conference
Eurobrake 2015
Projects
REBRAKE - G.A. 324385
Note

QC 20170613

Available from: 2017-06-11 Created: 2017-06-11 Last updated: 2017-06-13Bibliographically approved

Open Access in DiVA

No full text

Other links

http://2015.eurobrake.net/

Search in DiVA

By author/editor
Alemani, MattiaOlofsson, UlfPerricone, GuidoSöderberg, AndersWahlström, Jens
By organisation
TribologiMachine Design (Dept.)
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar

Total: 13 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • 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