Semester

Fall

Date of Graduation

2001

Document Type

Thesis

Degree Type

MS

College

Statler College of Engineering and Mineral Resources

Department

Mechanical and Aerospace Engineering

Committee Chair

Mridul Gautam.

Abstract

In the current study, a statistically designed experiment was developed to study the effects of soot contaminated engine oil on wear. The variables that were considered were the Base stock (Group1, Group2), Dispersant level and ZDP level. The above three variables were formulated at two levels: Low (-1), and High (1), which resulted in 23 matrix (8 oil blends). Soot was also one of the variables and was tested at three levels: Low (-1), Medium (0) and High (1).;A three-body-wear machine was employed to simulate and estimate the extent of wear, as it is very difficult to test each oil sample on an engine. The extent of wear was measured as the actual loss of material, in milligrams. A second set of experiments was performed on a milling machine (Ball-on-flat-disc setup) using a specially designed chuck and aluminum cup. The wear scars formed on the steel ball were measured using a Scanning Electron Microscope (SEM). These wear scars were analyzed qualitatively to determine the effect of soot-contaminated oils on wear.;A third set of experiments involved measuring the viscosity of the various oil formulations at 40°C and 90°C to examine the influence of soot present in the oil. (Abstract shortened by UMI.).

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