Microstructure-Based Fatigue Life Prediction Methods for Naval Steel Structures
Annual rept. no. 1, 15 Jul 1991-15 Jul 1992
SOUTHWEST RESEARCH INST SAN ANTONIO TX
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The goal of the subject program is to develop fundamental understandings of the relationships between microstructure and fatigue damage in structural steels of interest to naval applications. Quantitative descriptions of these relationships will be incorporated within practical engineering models for the prediction of S-N fatigue life. The focus of the first year of the program has been on experimental observations of fatigue damage in different microstructures for HSLA steels. Experimental methods were developed to study microcrack nucleation and growth with S-N fatigue specimens. Microstructures were modified with various heat treatments and characterized with appropriate optical and electron microscopy. The basic framework of potential microstructure-fatigue damage relationships has been sketched out.
- Metallurgy and Metallography
- Marine Engineering