Identifier

etd-06042014-135957

Degree

Master of Science in Mechanical Engineering (MSME)

Department

Mechanical Engineering

Document Type

Thesis

Abstract

The effect of prior corrosion fatigue damage on the thermographic response of 1018 low carbon steel is investigated. Specimens were subject to rotating bending fatigue at 38 Hz loading frequency while being exposed to a 3.5% NaCl and distilled water solution. Some specimens were subject to corrosion fatigue for part of their fatigue life and then their thermographic response measured under fatigue in air at 62 Hz loading frequency. Fatigue tests in air with thermographic measurement were performed as a comparison. It was observed that the initial temperature rise after corrosion fatigue fits the previously proposed model for air fatigue, N_f=c_1 R_θ^(c_2 ). The constants c_1 and c_2 were determined to be 11,110 and -0.7, respectively, for fatigue in air and fatigue following corrosion fatigue. Using a statistical analysis method, a lower bound conservative fatigue life prediction methodology is proposed to estimate the minimum remaining life for a given R_θ value. Verification tests were performed, with conservative fatigue life predictions given in every case.

Date

2014

Document Availability at the Time of Submission

Secure the entire work for patent and/or proprietary purposes for a period of one year. Student has submitted appropriate documentation which states: During this period the copyright owner also agrees not to exercise her/his ownership rights, including public use in works, without prior authorization from LSU. At the end of the one year period, either we or LSU may request an automatic extension for one additional year. At the end of the one year secure period (or its extension, if such is requested), the work will be released for access worldwide.

Committee Chair

Khonsari, Michael

DOI

10.31390/gradschool_theses.3880

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