Publication Date

1999

Document Type

Dissertation/Thesis

First Advisor

Gupta, Abhijit

Degree Name

M.S. (Master of Science)

Department

Department of Mechanical Engineering

LCSH

Reciprocating pumps||Hydraulic motors||Mechanical wear||Silicon nitride

Abstract

Axial piston hydraulic pumps and motors can experience wear-related failure modes when operated under extreme conditions, such as with particulate contaminated oil, at high oil temperatures, or during cavitation conditions. A thin, monolithic silicon nitride (Si[sub 3]N[sub 4]) wear plate was developed for the interface between the slippers and wobbler to improve reliability and survivability under such conditions. The concept was applied to the hydraulics in a Sundstrand Integrated Drive Generator. The wear plate material was selected through experimental screening of four different grades of silicon nitride (Si[sub 3]N[sub 4]) and five different grades silicon carbide (SiC). Wear resistance and flexural strength were the two primary criteria used in the selection process. Finite element methods were used to perform stress analysis for both the Si[sub 3]N[sub 4] wear plate and wobbler body. Margins of safety, fatigue life, and critical flaw size of the ceramic are calculated. Application testing verified the structural integrity of the Si[sub 3]N[sub 3] wear plate and wobbler. Tremendous wear and contamination resistance of the Si[sub 3]N[sub 4] insert was also demonstrated under severe test conditions.

Comments

Includes bibliographical references (pages [57]-58).

Extent

viii, 75 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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