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Torbacke, M., Rudolphi, Å. K. & Kassfeldt, E. (2014). Lubricants: Introduction to Properties and Performance (ed.). Paper presented at . Chichester: John Wiley & Sons
Open this publication in new window or tab >>Lubricants: Introduction to Properties and Performance
2014 (English)Book (Refereed)
Abstract [en]

Those working with tribology often have a background in mechanical engineering, while people working with lubricant development have a chemistry/chemical engineering background. This means they have a tradition of approaching problems in different ways. Today’s product development puts higher demands on timing and quality, requiring collaboration between people with different backgrounds. However, they can lack understanding of each other’s challenges as well as a common language, and so this book aims to bridge the gap between these two areas.Lubricants: Introduction to Properties and Performance provides an easy to understand overview of tribology and lubricant chemistry. The first part of the book is theoretical and provides an introduction to tribological contact, friction, wear and lubrication, as well as the basic concepts regarding properties and the most commonly made analyses on lubricants. Base fluids and their properties and common additives used in lubricants are also covered. The second part of the book is hands-on and introduces the reader to the actual formulations and the evaluation of their performance. Different applications and their corresponding lubricant formulations are considered and tribological test methods are discussed. Finally used oil characterisation and surface characterisation are covered which give the reader an introduction to different methods of characterising used oils and surfaces, respectively.

Place, publisher, year, edition, pages
Chichester: John Wiley & Sons, 2014. p. 191
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-16769 (URN)10.1002/9781118799734 (DOI)2-s2.0-84927684674 (Scopus ID)f2d29e2a-7134-430b-8541-f393b52864cb (Local ID)978-91-7439-410-8 (ISBN)f2d29e2a-7134-430b-8541-f393b52864cb (Archive number)f2d29e2a-7134-430b-8541-f393b52864cb (OAI)
Note
Godkänd; 2014; 20150127 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Torbacke, M., Rudolphi, Å. K. & Kassfeldt, E. (2012). Lubricants: properties and performance. Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Lubricants: properties and performance
2012 (English)Book (Other (popular science, discussion, etc.))
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2012. p. 166
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-16461 (URN)2edb7115-7007-459d-941a-1279dd2da765 (Local ID)978-91-7439-410-8 (ISBN)2edb7115-7007-459d-941a-1279dd2da765 (Archive number)2edb7115-7007-459d-941a-1279dd2da765 (OAI)
Note

Godkänd; 2012; 20120221 (elka)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-01-10Bibliographically approved
Björling, M., Larsson, R., Marklund, P. & Kassfeldt, E. (2011). Elastohydrodynamic lubrication friction mapping: The influence of lubricant, roughness, speed, and slide-to-roll ratio (ed.). Paper presented at Nordic Symposium on Tribology : 08/06/2010 - 11/06/2010. Proceedings of the Institution of mechanical engineers. Part J, journal of engineering tribology, 225(7), 671-681
Open this publication in new window or tab >>Elastohydrodynamic lubrication friction mapping: The influence of lubricant, roughness, speed, and slide-to-roll ratio
2011 (English)In: Proceedings of the Institution of mechanical engineers. Part J, journal of engineering tribology, ISSN 1350-6501, E-ISSN 2041-305X, Vol. 225, no 7, p. 671-681Article in journal (Refereed) Published
Abstract [en]

A friction test is conducted in a Wedeven Associates Machine ball-on-disc test rig. The output from the test, friction coefficient versus entrainment speed and slide-to-roll ratio (SRR), is presented as a three-dimensional friction map. A number of parameters are varied while studying the friction coefficient; surface roughness, base oil viscosity, base oil type, and extreme pressure (EP) additive package. Entrainment speed, SRR, and oil temperature are also varied. The results show that the mapping is efficient in showing the different types of friction that may occur in an elasto-hydrodynamic lubrication contact. The results also show that the friction behaviour can be strongly influenced by changing surface roughness as well as base oil viscosity, base oil type, EP additive content, and operating temperature.

National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-11298 (URN)10.1177/1350650111403363 (DOI)000293925100012 ()2-s2.0-79960218308 (Scopus ID)a3d7c1f2-462e-4803-97d8-e47203a47cd9 (Local ID)a3d7c1f2-462e-4803-97d8-e47203a47cd9 (Archive number)a3d7c1f2-462e-4803-97d8-e47203a47cd9 (OAI)
Conference
Nordic Symposium on Tribology : 08/06/2010 - 11/06/2010
Note
Validerad; 2011; 20110808 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Marklund, P., Berglund, K. & Kassfeldt, E. (2010). Baldos II, Sweden's most fuel efficient car: approved for street use (ed.). In: (Ed.), (Ed.), SAE 2010 Powertrains, Fuels and Lubricants Meeting: October 25 - 27, 2010, San Diego, California, USA ; [papers]. Paper presented at SAE Powertrains, Fuels and Lubricants Meeting : 25/10/2010 - 27/10/2010. Warrendale, Pa: Society of Automotive Engineers, Incorporated
Open this publication in new window or tab >>Baldos II, Sweden's most fuel efficient car: approved for street use
2010 (English)In: SAE 2010 Powertrains, Fuels and Lubricants Meeting: October 25 - 27, 2010, San Diego, California, USA ; [papers], Warrendale, Pa: Society of Automotive Engineers, Incorporated , 2010Conference paper, Meeting abstract (Other academic)
Abstract [en]

Baldos II originates as an entry for the 2009 Shell Eco-marathon competition. It is built in cooperation between students from different fields of study, such as Mechanical Engineering, Industrial Design Engineering and Computer Science from Luleå University of Technology, Sweden. The car has been designed to meet the requirements set by Swedish authorities for legal street use. This includes wind screen wiper, 3-point seat belt, proper lighting, reverse gear and twin electric engines. Baldos II is tested and found to be Sweden's most fuel efficient car approved for street use.The internal combustion engine in the serial hybrid drive train is modified from an ordinary gasoline engine to run on pure ethanol. The fuel consumption of the vehicle corresponds to 0.065 litres ordinary gasoline/10 km, which results in a CO2 emission of 12 g/km. The car is design for one person only, and has room for a luggage in the size of an ordinary cabin bag. With full tank the total weight is 220 kg, and the total length is 2650 mm. The light weight has been achieve thorough an advanced monocoque chassis manufactured of carbon fiber sandwich construction.According to safety regulations the car is equipped with dual circuit hydraulic disc brakes. Today, the Team Baldos aims for defining a higher standard for street vehicles in Sweden.

Place, publisher, year, edition, pages
Warrendale, Pa: Society of Automotive Engineers, Incorporated, 2010
Series
SAE Technical Paper Series, ISSN 0148-7191 ; 2010-01-2086
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-36991 (URN)adcc9a60-cbc4-11df-a707-000ea68e967b (Local ID)adcc9a60-cbc4-11df-a707-000ea68e967b (Archive number)adcc9a60-cbc4-11df-a707-000ea68e967b (OAI)
Conference
SAE Powertrains, Fuels and Lubricants Meeting : 25/10/2010 - 27/10/2010
Note
Godkänd; 2010; 20100929 (kimber)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-03-09Bibliographically approved
Björling, M., Larsson, R., Marklund, P. & Kassfeldt, E. (2010). EHL friction mapping: the influence of lubricant, roughness, speed and slide to roll ratio (ed.). In: (Ed.), (Ed.), 14th Nordic Symposium on Tribology: NORDTRIB 2010 : Storforsen, Sweden, June 8-11, 2010. Paper presented at Nordic Symposium on Tribology : 08/06/2010 - 11/06/2010. Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>EHL friction mapping: the influence of lubricant, roughness, speed and slide to roll ratio
2010 (English)In: 14th Nordic Symposium on Tribology: NORDTRIB 2010 : Storforsen, Sweden, June 8-11, 2010, Luleå: Luleå tekniska universitet, 2010Conference paper, Published paper (Refereed)
Abstract [en]

A friction test is conducted in a WAM ball on disc test rig. The output from the test is friction coefficient versus entrainment speed and slide-to-roll ratio presented as a 3D friction map. A number of parameters are varied while studying the friction coefficient; surface roughness, base oil viscosity and EP additive package. Entrainment speed, slide to roll ratio and oil temperature are also varied. The results show that the mapping is efficient in showing the different types of friction that may occur in an EHL contact. The results also show that the friction behaviour can be strongly influenced by changing surface roughness as well as base oil viscosity, EP additive content and operating temperature.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2010
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-38467 (URN)ce13a780-836e-11df-ab16-000ea68e967b (Local ID)978-91-7439-124-4 (ISBN)ce13a780-836e-11df-ab16-000ea68e967b (Archive number)ce13a780-836e-11df-ab16-000ea68e967b (OAI)
Conference
Nordic Symposium on Tribology : 08/06/2010 - 11/06/2010
Note
Godkänd; 2010; Bibliografisk uppgift: CD-ROM; 20100629 (ysko)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-03-09Bibliographically approved
Marklund, P., Almqvist, A. & Kassfeldt, E. (Eds.). (2010). Nordtrib 2010: 14th Nordic Symposium on Tribology, Storforsen, Sweden (ed.). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Nordtrib 2010: 14th Nordic Symposium on Tribology, Storforsen, Sweden
2010 (English)Collection (editor) (Other academic)
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2010
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-21726 (URN)df2e1e50-7f5a-11df-ab16-000ea68e967b (Local ID)978-91-7439-124-4 (ISBN)df2e1e50-7f5a-11df-ab16-000ea68e967b (Archive number)df2e1e50-7f5a-11df-ab16-000ea68e967b (OAI)
Note
Godkänd; 2010; Bibliografisk uppgift: CD-ROM; 20100624 (parmar)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-03-09Bibliographically approved
Gren, P. & Kassfeldt, E. (2009). Feasibility of using digital speckle correlation in the study of seal contacts (ed.). Paper presented at . Lubrication Science, 21(4), 123-134
Open this publication in new window or tab >>Feasibility of using digital speckle correlation in the study of seal contacts
2009 (English)In: Lubrication Science, ISSN 0954-0075, E-ISSN 1557-6833, Vol. 21, no 4, p. 123-134Article in journal (Refereed) Published
Abstract [en]

This paper presents studies of the contact between a soft rubber specimen and glass counterface using the Digital Speckle Correlation method, which provides information of displacements and structural similarities between recorded images. The setup is designed with a real contact and changes in the contact can be varied. Microscopic images using laser light illumination for different displacements are recorded and correlated. The results show that the contact area can be identified both for dry and lubricated contacts. The method can be applied on different geometries, surface roughness and lubricants. Influences of scars and contaminations, e.g. wear particles, may also be analysed.

National Category
Applied Mechanics Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Experimental Mechanics; Machine Elements
Identifiers
urn:nbn:se:ltu:diva-8764 (URN)10.1002/ls.77 (DOI)000268398500001 ()2-s2.0-66849115568 (Scopus ID)74c62960-3f9e-11de-bc0c-000ea68e967b (Local ID)74c62960-3f9e-11de-bc0c-000ea68e967b (Archive number)74c62960-3f9e-11de-bc0c-000ea68e967b (OAI)
Note
Validerad; 2009; 20090513 (gren)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Lundmark, J., Kassfeldt, E., Hardell, J. & Prakash, B. (2009). The influence of initial surface topography on tribological performance of the wheel/rail interface during rolling/sliding conditions (ed.). Paper presented at . Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, 223(2), 181-187
Open this publication in new window or tab >>The influence of initial surface topography on tribological performance of the wheel/rail interface during rolling/sliding conditions
2009 (English)In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 223, no 2, p. 181-187Article in journal (Refereed) Published
Abstract [en]

The influence of surface roughness in a rail/wheel contact has been a concern for railway owners since the introduction of ‘rail grinding' as a maintenance strategy. Presently, there are no well-defined guidelines regarding the surface topographies of ground rails and re-turned wheels. There is thus a need to establish scientific guidelines regarding the surface topographies for the rails and wheels in order to minimize grinding costs/time and to improve rail/wheel performance. This study is aimed at investigating the influence of surface topographies of wheels and rails on running-in behaviour, wear, friction, and the resultant surface damage through experimental simulation in the laboratory. A two-disc rolling/sliding test machine has been used in this experimental work. Two different roughness values were produced on both the rail and wheel test specimens. A design of experiment approach has been used to conduct experiments and to analyse the results. The results show that the surface roughness values of the specimens in some material pairs do influence wear, friction, and resulting surface damage.

National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-4417 (URN)10.1243/09544097JRRT223 (DOI)000264722400010 ()2-s2.0-69249090585 (Scopus ID)25d7c7b0-0839-11de-bf94-000ea68e967b (Local ID)25d7c7b0-0839-11de-bf94-000ea68e967b (Archive number)25d7c7b0-0839-11de-bf94-000ea68e967b (OAI)
Note
Validerad; 2009; 20090303 (brap)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Kassfeldt, E. & Lundmark, J. (2009). Tribological properties of hardened high strength Boron steel at combined rolling and sliding condition (ed.). Paper presented at . Wear, 267(12), 2287-2293
Open this publication in new window or tab >>Tribological properties of hardened high strength Boron steel at combined rolling and sliding condition
2009 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 267, no 12, p. 2287-2293Article in journal (Refereed) Published
Abstract [en]

The use of hardened high strength steel is found in applications where high wear resistance is required. The wear properties of high strength Boron steel are well known in applications with abrasive wear from stones, ore and other hard material. A unique concept of wear protection of rails is newly presented, a wear resistant cap made of hardened high strength Boron steel.Reducing the wear of rails and wheels and controlling the frictional behavior in the wheel/rail contact are two key issues for railway owners in order to reduce the increasing costs related to higher axle loads, higher speeds, more frequent traffic, etc. Therefore, the aim of this work has been to investigate and compare the tribological properties of Boron steel and UIC 1100 rail steel in contact with Blue Light wheel steel (AAR Class C (69-JDG-8)) under dry and water lubricated conditions in a two-disc tribometer. Advanced analytical instruments including 3D optical surface profiler, micro-hardness indenter, light microscope and SEM/EDS were used to analyze the results.Results from the experiments show that the friction coefficient in tests with Boron steel is more stable both in dry and water lubricated conditions than tests including UIC 1100 rail steel used in todays application. Surface damages seen from water lubricated tests on UIC 1100 rail steel are not seen on the surface of the Boron steel discs. In all tests, the wear decreased when water was added in the contact and friction was slightly decreased.

Keywords
Engineering mechanics - Mechanical manufacturing, Teknisk mekanik - Mekanisk tillverkningsteknik
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-4595 (URN)10.1016/j.wear.2009.09.014 (DOI)000272810200018 ()2-s2.0-71849107893 (Scopus ID)28f1b2d0-e4ac-11de-bae5-000ea68e967b (Local ID)28f1b2d0-e4ac-11de-bae5-000ea68e967b (Archive number)28f1b2d0-e4ac-11de-bae5-000ea68e967b (OAI)
Note
Validerad; 2009; Bibliografisk uppgift: NORDTRIB 2008; 20091209 (elka)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Pettersson, A., Kassfeldt, E. & Minami, I. (2008). Additives for environmentally adapted lubricants: tribo film formation (ed.). Paper presented at . Tribology Online, 3(3), 168-172
Open this publication in new window or tab >>Additives for environmentally adapted lubricants: tribo film formation
2008 (English)In: Tribology Online, ISSN 1881-2198, Vol. 3, no 3, p. 168-172Article in journal (Refereed) Published
Abstract [en]

Five different anti-wear additives, suitable to formulate environmentally adapted hydraulic fluids, were tested. The used base fluid was a saturated, environmentally adapted synthetic complex ester. The tested materials were steel-steel and bronze-steel. A modified Falex pin and a vee-block tester were used for the tribotests. XPS was used to characterize the surfaces. It was found that the new types of more polar additives work better than the traditional ones, though they can give selective transfer of cupper to the steel pin. To use this type of additives in fully formulated products more investigations have to be performed.

National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-4388 (URN)25404790-541c-11dd-ad06-000ea68e967b (Local ID)25404790-541c-11dd-ad06-000ea68e967b (Archive number)25404790-541c-11dd-ad06-000ea68e967b (OAI)
Note
Godkänd; 2008; 20080717 (elka)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-03-13Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-5988-9647

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