TY - JOUR
T1 - 1-second-resolved strain mapping in Ti-6Al-4V alloys during dwell fatigue in SEM by video sampling moiré
AU - Wang, Qinghua
AU - Ri, Shien
AU - Maenosono, Akira
AU - Tanaka, Yoshihisa
AU - Koyama, Motomichi
N1 - Funding Information:
This research was supported by the Structural Materials for Innovation of the Cross ministerial Innovation Promotion Program (SIP) of Japan Science and Technology (JST).
Publisher Copyright:
© 2019
PY - 2019/6
Y1 - 2019/6
N2 - Towards clarifying underlying behavior of dwell fatigue in Ti alloys, we here present the first example of 1 second- and 1 μm-resolved full-field dynamic strain mapping. It has been realized by developing a video sampling moiré method combined with a video acquisition way in a scanning electron microscope (SEM). Monotonic strain increments during displacement holding for 10 min in dwell fatigue are visually characterized in both smooth and cracked Ti-6Al-4V specimens. The strain rates from 10 −6 to 10 −5 s −1 of average and maximum strains, as well as the remaining plastic strain were experimentally measured in both specimens. The strain distributions are coupled with grain boundaries to discuss the strain evolution characteristics. Experimental results indicate that both crack initiation and growth in the Ti-6Al-4V alloy are sensitive to even several tens of second-scale load/displacement holding.
AB - Towards clarifying underlying behavior of dwell fatigue in Ti alloys, we here present the first example of 1 second- and 1 μm-resolved full-field dynamic strain mapping. It has been realized by developing a video sampling moiré method combined with a video acquisition way in a scanning electron microscope (SEM). Monotonic strain increments during displacement holding for 10 min in dwell fatigue are visually characterized in both smooth and cracked Ti-6Al-4V specimens. The strain rates from 10 −6 to 10 −5 s −1 of average and maximum strains, as well as the remaining plastic strain were experimentally measured in both specimens. The strain distributions are coupled with grain boundaries to discuss the strain evolution characteristics. Experimental results indicate that both crack initiation and growth in the Ti-6Al-4V alloy are sensitive to even several tens of second-scale load/displacement holding.
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U2 - 10.1016/j.mechmat.2019.03.002
DO - 10.1016/j.mechmat.2019.03.002
M3 - Article
AN - SCOPUS:85062588334
SN - 0167-6636
VL - 133
SP - 63
EP - 70
JO - Mechanics of Materials
JF - Mechanics of Materials
ER -