The purpose of the research is to apply the modified Hartman-Schijve equation for predicting small crack growth rate in additive manufactured titanium Ti-6Al-4V. Material constants in the equation were determined by long crack test data, and the threshold of the stress intensity factor range was set to a small value. A small fatigue crack test was conducted to validate the fitted equation. Predicted fatigue life of another specimen configuration under bending load agreed well with the test result. The work shows that it may be possible to represent both small and long crack growth rates by the modified Hartman-Schijve equation with its material constants being determined by long crack test.
Bibliographical noteNOTICE: this is the author’s version of a work that was accepted for publication in Engineering Fracture Mechanics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Engineering Fracture Mechanics, 253, (2021)
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- small/short cracks
- surface roughness
- fracture mechanics
- finite element analysis