Micro and nano mechanics of materials response during instrumented frictional sliding

Over the past decade, many computational studies have explored the mechanics of instrumented normal indentation. In contrast, very few studies have investigated quantitative aspects of frictional sliding contact in the elasto-plastic regime. In this thesis, a new framework was developed to establish relationships between the frictional sliding response, material properties and contact parameters. Dimensional analysis enabled to define scaling variables and dimensionless functions. Finite element methods were used to simulate the process of steady-state frictional sliding and evaluate the dimensionless functions. In frictional sliding, the representative plastic strain was found to be more than four times as large as in normal indentation. Further comparison with indentation indicated a three fold increase in the maximum pile-up height and an increased influence of the strain hardening on hardness. Experimental studies were conducted with and without a liquid lubricant in selected material systems. Quantitative agreements with numerical predictions were observed in all cases. The strong influence of the strain hardening exponent on the pile-up height was illustrated from frictional sliding results obtained in copper and copper-zinc specimens of different grain sizes.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Materials Science and Engineering.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2006

Author dc:creator

• Bellemare, Simon C. (Simon Claude)

Advisor dc:contributor.advisor

• Subra Suresh.

• Materials Science and Engineering.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/36207

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/36207