Numerical models for scoring failures of flexible metal to metal face seals

The flexible metal to metal face seals (FMMFS) has unique features including much more flexibility in the circumferential direction than in the radial direction, identical rotating and stationary seals, and a loading mechanism using elastomeric rings. This thesis work is the first attempt to explain scoring failures of this unique type of mechanical face seal. Numerical models and new scoring failure criteria were developed to explain different scoring failures of the FMMFS. The numerical models consider interactions among seal surface deflections, lubrication in the sealing band and thermal effects simultaneously. The numerical models were validated from comparisons with experiments and applied to scoring failure tests. The new scoring failure criterion successfully predicted the likelihood of scoring failures for each seal pair at given loads and speeds. From in-depth analysis of the seal pairs with low and high scoring failure speeds, it has been shown that discontinuous contact patterns can increase scoring resistance of the seal pair. These discontinuous contact patterns are created by irregular surface profiles of the sealing band. Irregular surface profiles can decrease high temperature regions by reducing superposition of temperatures and thermal conduction resistance, and finally delay scoring failures.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Mechanical Engineering.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2005

Author dc:creator

• Hong, Jinchul, 1977-

Advisor dc:contributor.advisor

• Douglas P. Hart and Tian Tian.

• 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/1721.1/30339

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/30339