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Abstract
This paper describes a study into the evolution of damage in commercial-purity titanium (CP–Ti) sheets subjected to cyclic bending under tension (CBT) and uniaxial tension (simple tension, ST). Sections were taken from sheets that were strained to various levels under both methods and were imaged using X-ray computed tomography (XCT) to reveal insights into the size, density, and distribution of microvoids in the sheets. Digital image correlation (DIC) was also used to observe the surface strain of CBT and ST sheets during testing. These results showed that elongation to failure (ETF) for CBT deformation is about 2.5× higher than for ST, local longitudinal strains in the bulk of the CBT sample are around 1.3× higher than the peak strain in the ST necked region, and 1.7× higher in the localized region of CBT failure. It was found that the volume-density of voids in both sheets followed a similar exponential increase with strain, reaching nearly 45× higher in the CBT than the ST sheets before the onset of failure, mainly due to the higher strain levels achieved. A higher volume density of voids developed in the center of sheets at high levels of strain, for both processes, with the density in the sheet center becoming approximately double that found near the edges. Scanning electron microscopy (SEM) was used to examine the fracture surface of CBT and ST sheets after failure. The observations are presented and discussed highlighting the CBT process as effective to delay ductile fracture of the CP-Ti sheets.
Department
Mechanical Engineering
Publication Date
7-26-2024
Journal Title
Journal of Materials Research and Technology
Publisher
Elsevier BV
Digital Object Identifier (DOI)
Document Type
Article
Recommended Citation
Nicholas Pitkin, Philip Noell, David T. Fullwood, Marko Knezevic, Damage evolution and ductile fracture of commercially-pure titanium sheets subjected to simple tension and cyclic bending under tension, Journal of Materials Research and Technology, Volume 32, 2024, Pages 124-139, ISSN 2238-7854, https://doi.org/10.1016/j.jmrt.2024.07.149.
Rights
© 2024 The Authors.
Comments
This is an open access article published by Elsevier BV in Journal of Materials Research and Technology in 2024, available online: https://dx.doi.org/10.1016/j.jmrt.2024.07.149