Tribology

Code:

EM535

Acronym:

T

Instance: 2005/2006 - 1S

Active?	Yes
Responsible unit:	Applied Mechanics Section
Institution Responsible:	Faculty of Engineering

Cycles of Study/Courses

Acronym	No. of Students	Study Plan	Curricular Years	Credits UCN	Credits ECTS	Contact hours	Total Time
LEM	10	Plano de Estudos EM Oficial a partir de 2000	5	3,5	7	-
		Plano para Bachareis EM a partir 2000	2	3,5	7	-

Teaching language

Portuguese

Objectives

Hydrodynamic Lubrication: study of bearings in the turbulent regime.

Hydrostatica lubrication: radial bearings analysis.

Theoretical analysis of the contact and lubrication between elastic solids of revolution.

Design and selection of rolling bearings, gears and cams considering the theories of contact mechanics and EHD lubrication.

Analysis of surface failures in EHD contacts and their relation with lubrication.

Program

HYDRODYNAMIC LUBRICATION:
Turbulence, Thermal analysis of the bearings, Dynamic study, Instability.

HYDROSTATIC LUBRICATION:
Radial bearings in the laminar regime, Hibrid bearings.

CONTACT MECHANICS:
Introduction, Contact between solids of revolution (Hertz theory), Stresses inside contacting solids, Influence of surface roughness on contact pressures and stresses. Applications.

ELASTOHIDRODYNAMIC LUBRICATION:
Lubricants. Theory of elastohidrodynamic lubrication, lubricant film thickness and pressure distribution. Lubricant rheology and thermal behaviour of the EHD contact. Influence of surface roughness on EHD lubrication. Applications.

APPLICATIONS OF CONTACT MECHANICS AND EHD LUBRICATION:
Gears – Lubrication and surface failures(contact fatigue, scuffing and excessive wear). Rolling bearings – Lubrication, internal friction and surface failures. Contact fatigue in EHD contacts.

Mandatory literature

Jorge Seabra; «MECÂNICA DO CONTACTO HERTZIANO», Seabra-SMAp-DEMEGI-FEUP, 2003
Jorge Seabra, Armando Campos e Alexandre Sottomayor; «LUBRIFICAÇÃO ELASTOHIDRODINÂMICA», Seabra-SMAp-DEMEGI-FEUP, 2002
Jorge Seabra; «ENGRENAGENS - LUBRIFICAÇÃO, RENDIMENTO E AVARIAS, Seabra-SMAp-DEMEGI-FEUP, 2005
Jorge Seabra; «PROBLEMAS PROPOSTOS, FORMULÁRIO, FOLHA DE CÁLCULO E APLICAÇÕES MatLab EM MECÂNICA DO CONTACTO E LUBRIFICAÇÃO ELASTOHIDRODINÂMICA», Seabra-SMAp-DEMEGI-FEUP, 2005

Complementary Bibliography

Johnson, K. L.; Contact mechanics. ISBN: 0-521-25576-7
Gohar, Ramsey; Elastohydrodynamics. ISBN: 0-85312-820-0
Dowson, D.; Elasto-hydrodynamic lubrification. ISBN: 0-08-021303-0
Hamrock, Bernard J.; Fundamentals of fluid film lubrification. ISBN: 0-07-113356-9
Boresi, Arthur P.; Advanced mechanics of materials. ISBN: 0-471-55157-0
J. Ayel; La Lubrification Industrielle, Tome 1 - Introduction à la Lubrification des Engrenages, Publications de L’Institut Français du Pétrole, Éditions Technip, Paris, 1984. ISBN: 2-7108-0471
G. Henriot; La Lubrification Industrielle, Tome 1 - La Lubrification des Engrenages, Publications de L’Institut Français du Pétrole, Éditions Technip, Paris, 1984. ISBN: 2-7108-0471
KLUBER Lubrication; Lubrication of gear systems – From large to small stationary gear sets, Edition 12.98, Kluber Lubrication Munchen KG, Germany, 1998

Teaching methods and learning activities

Theoretical lessons - 34 hours.

Practical lessons - 12 hours.

Tests - 4 hours.

Software

Não aplicável.

Evaluation Type

Distributed evaluation with final exam

Assessment Components

Description	Type	Time (hours)	Weight (%)	End date
Subject Classes	Participação presencial	52,00
	Total:	-	0,00

Eligibility for exams

Frequency is attained when the students attend a minimum of lectured courses.

Calculation formula of final grade

It will be the mark obtained in the Final Exams, according to FEUP reguatations.

Examinations or Special Assignments

During the semester some particular work can be develloped by the students.

Special assessment (TE, DA, ...)

According with FEUP regulations.

Classification improvement

According with FEUP regulations..

Observations

Not applicable.