TY - JOUR
T1 - 3D short fatigue crack closure behavior in Ti-6Al-4V alloy investigated using in-situ high resolution synchrotron X-ray tomography
AU - Tubei, Valary
AU - Toda, Hiroyuki
AU - Hassanipour, Meysam
AU - Hirayama, Kyosuke
AU - Takakuwa, Osamu
AU - Takeuchi, Akihisa
AU - Uesugi, Masayuki
N1 - Funding Information:
The synchrotron radiation experiments were performed at SPring-8 with the approval of Japan Synchrotron Radiation Research Institute through proposal number 2017A0076 and 2018A0076. This work was supported through the Grant-in-Aid for scientific research from Structural Materials for Innovation (SM41) of the Cross-ministerial Strategic Innovation Program (SIP) and Light Metals Education Foundation. This study is also grateful for the support of the Grant-in-Aid for Scientific Research from JSPS, Subject No. 17H01328.
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/5/15
Y1 - 2021/5/15
N2 - In-situ synchrotron X-ray microtomography has been employed to investigate the three-dimensional (3D) closure behavior of short fatigue crack in Ti-6Al-4V alloy. At a spatial resolution level of 1 µm, tomography datasets were taken at two short crack fronts to observe the time evolution behavior of closure (sometimes called 4D imaging). Owing to the high spatial resolution level, the complex 3D crack morphology consisting of deflections, facet paths and crack branching/overlap caused by the 3D variation in the microstructural features were readily observed together with the occurrence of crack closure. This study separated the contributions of near-tip and behind-tip crack closure and observed their behavior with crack growth. It was deduced that the evolution of behind-tip closure with increase in crack length predominantly affects the overall closure behavior in the short crack regime. Crack front closure behavior variation was found to be attributable to the existence of different crack path morphologies which showed varied degree of fracture surface roughness due to Mode II and Mode III displacements. The relationship between closure, crack tip opening displacement range (ΔCTOD) and crack growth rate are also discussed.
AB - In-situ synchrotron X-ray microtomography has been employed to investigate the three-dimensional (3D) closure behavior of short fatigue crack in Ti-6Al-4V alloy. At a spatial resolution level of 1 µm, tomography datasets were taken at two short crack fronts to observe the time evolution behavior of closure (sometimes called 4D imaging). Owing to the high spatial resolution level, the complex 3D crack morphology consisting of deflections, facet paths and crack branching/overlap caused by the 3D variation in the microstructural features were readily observed together with the occurrence of crack closure. This study separated the contributions of near-tip and behind-tip crack closure and observed their behavior with crack growth. It was deduced that the evolution of behind-tip closure with increase in crack length predominantly affects the overall closure behavior in the short crack regime. Crack front closure behavior variation was found to be attributable to the existence of different crack path morphologies which showed varied degree of fracture surface roughness due to Mode II and Mode III displacements. The relationship between closure, crack tip opening displacement range (ΔCTOD) and crack growth rate are also discussed.
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U2 - 10.1016/j.engfracmech.2021.107755
DO - 10.1016/j.engfracmech.2021.107755
M3 - Article
AN - SCOPUS:85105295092
SN - 0013-7944
VL - 249
JO - Engineering Fracture Mechanics
JF - Engineering Fracture Mechanics
M1 - 107755
ER -