Seminar 30th January 2013 2:30 p.m. Building 5, Room 2015
Towards improved models for frictional contact
Professor David Nowell
University of Oxford
- Submitter
- Luke Goater
Numerical methods such as finite elements allow us to analyse systems with considerable precision. However, many of these systems contain frictional interfaces, and our models of friction are little more sophisticated than that proposed by Amontons in 1699. Real frictional contacts can exhibit behaviour which is not well modelled by Amontons/Coulomb friction and our present state of understanding means that it is not generally possible to predict friction coefficients or contact stiffness from underlying material or geometric properties. The seminar will present some examples of frictional behaviour under reciprocating sliding conditions before focussing more specifically on tangential contact stiffness. Experimental measurements obtained by digital image correlation and ultrasound methods will be presented and compared. A simple theoretical model will also be discussed.
BIOGRAPHY
Professor David Nowell studied engineering at the University of Cambridge. After a short period in industry, he studied for a D.Phil. in fretting fatigue at the University of Oxford. Since 1988 he has been a university lecturer at Oxford. He has studied a wide range of problems in solid mechanics, but has particular interests in fatigue and contact problems. He is on the editorial boards of The International Journal of Fatigue, Strain, and the Journal of Strain Analysis. Between 1999 and 2009 David was director of the Rolls-Royce UTC in solid mechanics at Oxford.
This seminar is part of the joint research group initiative and researchers from ALL groups (Bio, Materials and nCATS) should attend. Others also are welcome.
Tea, coffee and biscuits will be served from 14:15.