Microstructure-Based Fatigue Life Prediction Methods for Naval Steel Structures

The ongoing development of new HSLA (high-strength, low alloy) steels for use in ship and submarine structures permits increases in design stress levels, which may in turn increase the significance of fatigue cracking as a threat to structural integrity. The subject program has been motivated by the...

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Bibliographic Details
Main Authors: Chan, K S, CmClung, R C, Torng, T Y
Format: Report
Language:English
Subjects:
CRACKS
FATIGUE LIFE
FRACTURE(MECHANICS)
LPN-SWRI-06-4414
MICROSTRUCTURE
NAVAL ARCHITECTURE
NUCLEATION
PREDICTIONS
Properties of Metals and Alloys
STOCHASTIC PROCESSES
STRUCTURAL STEEL
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Summary:The ongoing development of new HSLA (high-strength, low alloy) steels for use in ship and submarine structures permits increases in design stress levels, which may in turn increase the significance of fatigue cracking as a threat to structural integrity. The subject program has been motivated by the desire for improved understandings of the relationships between microstructure and fatigue damage in naval steel structures, with particular application to the prediction of fatigue life. Among the intended products of the study are improved methods for fatigue life prediction which give appropriate attention to different potential microstructures and associated microstructural influences on fatigue crack initiation and growth rates. The methods could be used to provide guidance in optimizing alloy chemistry, processing, and welding protocols for improved fatigue resistance, while also expediting improved fitness-for-service assessments of actual or postulated cracking.