An active-path-dissolution model for corrosion-fatigue cracking of drill-pipe steels in offshore drilling environments

The corrosion-fatigue life of drill-pipe steels in simulated offshore-drilling environments was predicted using an analytical model. This model, named the Active-Path-Dissolution (APD) model, simulates a sequence of three corrosion-fatigue processes: chemical notching process, microcrack development, and macroscopic crack growth. The first two processes are combined with mechanical fatigue to simulate corrosion-fatigue crack initiation. A series of fatigue-life simulations for a variety of corrosion-fatigue conditions were carried out. The effects of fluid aeration, electrolytic conductivity ($\eta$), electrochemical potential (E$\rm\sb{bulk}$), mean stress and stress ratio (R) effects, fluid temperatures (T), material yield strengths (S$\rm\sb{y}$), pre-existing notch (K$\rm\sb{t}$) effects, and test frequencies (f) were studied to provide data to validate the predictions of the APD model. Experience with the APD model suggests that microcrack development is the dominant period in the corrosion-fatigue life.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Civil Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Hsieh, Hung-Yuan

Contributors dc:contributor

• Lawrence, Frederick V., Jr

• Engineering, Civil
• Engineering, Marine and Ocean
• Engineering, Materials Science

Statement dc:rights

• Copyright 1995 Hsieh, Hung-Yuan

Language dc:language

eng

Identifier

AAI9624366
(UMI)AAI9624366

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/18946