Wear modeling with sensitivity to lubricant chemistry

The life of an automotive engine is often limited by the ability of its components to resist wear. Zinc dialkyl-dithiophosphate (ZDDP) is an engine oil additive that reduces wear in an engine by forming solid antiwear films at points of moving contact. The effects of this additive are fairly well understood, but there is little theory behind the kinetics of antiwear film formation and removal. This lack of dynamic modeling makes it difficult to predict the effects of wear at the design stage for an engine component or a lubricant formulation. The purpose of this research is to develop a theoretical and numerical framework for modeling the formation and evolution of ZDDP antiwear films based on the relevant chemical pathways and physical mechanisms at work. The ability to predict the development and function of thin solid films on rough surfaces and their effect on surface wear would be a useful tool in many tribological applications, both automotive and otherwise. Completely deterministic modeling of such films may not be possible due to the complex interactions between the numerous mechanical, thermal, and chemical variables over disparate magnitudes of time and length scales. However, it is believed that useful predictions can be made by constructing a mechanistic model in which all of the most important effects are included, even if only at an approximate level. Both the theoretical model and the numerical implementation of the concepts therein will be discussed in this work. Preliminary results from this effort are presented to illustrate feasibility and functionality on a qualitative level.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Mechanical Engineering.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2007

Author dc:creator

• Thomas, Benjamin C. (Benjamin Carl)

Advisor dc:contributor.advisor

• Victor W. Wang.

• Mechanical 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/1721.1/40948

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/40948