Experimental and numerical investigation into fatigue crack propagation models for 350WT steel


  1. Trask, D.A.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);DalTech, Halifax NS (CAN)
Fatigue analysis is a complex and uncertain process due to the numerous factors that may influence the crack growth process. The development of a fatigue model is important for planning inspection intervals, determining required maintenance, conducting a failure analysis and minimizing the problem of crack propagation in future designs. Various models have been proposed, however, no universal or all encompassing model exists. A state-of-the-art literature review of the available fatigue crack propagation models was conducted to identify their advantages, disadvantages and limitations. Emphasis was placed on models that are simple to evaluate and require few (if any) empirical curve fitting parameters. An experimental fatigue program was conducted, consisting of both a constant and variable amplitude loading phase on 350WT steel. This is an important structural steel with application to ships, bridges, cranes and towers, all of which are subjected to cyclic loading. The objective of the constant amplitude loading phase was to establish some baseline fatigue data at various stress ratios and to calibrate the available constant amplitude models. The objective of the variable amplitude loading phase was to quantify the magnitude of retardation when periodic tensile overloads are applied in a constant amplitude loading scenario. TRUNCATED
350WT steel;Cyclic loads
Report Number
DREA-CR-98-436 — Contractor Report
Date of publication
01 Jun 2000
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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