1-second-resolved strain mapping in Ti-6Al-4V alloys during dwell fatigue in SEM by video sampling moiré

Qinghua Wang; Shien Ri; Akira Maenosono; Yoshihisa Tanaka; Motomichi Koyama

doi:10.1016/j.mechmat.2019.03.002

1-second-resolved strain mapping in Ti-6Al-4V alloys during dwell fatigue in SEM by video sampling moiré

Qinghua Wang, Shien Ri, Akira Maenosono, Yoshihisa Tanaka, Motomichi Koyama

IMR - Materials Design Division

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	63-70
Number of pages	8
Journal	Mechanics of Materials
Volume	133
DOIs	https://doi.org/10.1016/j.mechmat.2019.03.002
Publication status	Published - 2019 Jun

Keywords

Creep
Deformation
Electron microscopy
Grain boundaries
Mechanical properties
Titanium alloys

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10.1016/j.mechmat.2019.03.002

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title = "1-second-resolved strain mapping in Ti-6Al-4V alloys during dwell fatigue in SEM by video sampling moir{\'e}",

abstract = " 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 moir{\'e} 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.",

keywords = "Creep, Deformation, Electron microscopy, Grain boundaries, Mechanical properties, Titanium alloys",

author = "Qinghua Wang and Shien Ri and Akira Maenosono and Yoshihisa Tanaka and Motomichi Koyama",

note = "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: {\textcopyright} 2019",

year = "2019",

month = jun,

doi = "10.1016/j.mechmat.2019.03.002",

language = "English",

volume = "133",

pages = "63--70",

journal = "Mechanics of Materials",

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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.

KW - Creep

KW - Deformation

KW - Electron microscopy

KW - Grain boundaries

KW - Mechanical properties

KW - Titanium alloys

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DO - 10.1016/j.mechmat.2019.03.002

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AN - SCOPUS:85062588334

SN - 0167-6636

VL - 133

SP - 63

EP - 70

JO - Mechanics of Materials

JF - Mechanics of Materials

ER -

1-second-resolved strain mapping in Ti-6Al-4V alloys during dwell fatigue in SEM by video sampling moiré

Abstract

Keywords

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