Very high cycle fatigue of TC4 titanium alloy under variable stress ratio: Failure mechanism and life prediction

Wei Li; Hongqiao Zhao; Abdelhak Nehila; Zhenyu Zhang; Tatsuo Sakai

doi:10.1016/j.ijfatigue.2017.08.004

Very high cycle fatigue of TC4 titanium alloy under variable stress ratio: Failure mechanism and life prediction

Wei Li^*
, Hongqiao Zhao
, Abdelhak Nehila
, Zhenyu Zhang
, Tatsuo Sakai

^*Corresponding author for this work

School of Mechanical Engineering

Beijing Institute of Technology
Fawer Automotive Parts Limited Company
Ritsumeikan University

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

66 Citations (Scopus)

Abstract

Axial loading tests with variable stress ratio were performed to investigate the very high cycle fatigue property of TC4 titanium alloy, and a life prediction approach associated with failure mechanism was proposed. The interior failure process is characterized as: (1) occurrence of slip lines or bands on partial α grains, (2) nucleation of micro-cracks within some α grains, (3) coalescence of micro-cracks and formation of granular bright facets, (4) stable macro-crack growth within fisheye (5) unstable crack growth outside fisheye and (6) momentary fracture. The validity of approach is confirmed by the good agreement between predicted and experimental results.

Original language	English
Pages (from-to)	342-354
Number of pages	13
Journal	International Journal of Fatigue
Volume	104
DOIs	https://doi.org/10.1016/j.ijfatigue.2017.08.004
Publication status	Published - Nov 2017

Keywords

Granular bright facets
Nucleation and growth
TC4 titanium alloy
Theory and modeling
Very high cycle fatigue

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10.1016/j.ijfatigue.2017.08.004

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title = "Very high cycle fatigue of TC4 titanium alloy under variable stress ratio: Failure mechanism and life prediction",

abstract = "Axial loading tests with variable stress ratio were performed to investigate the very high cycle fatigue property of TC4 titanium alloy, and a life prediction approach associated with failure mechanism was proposed. The interior failure process is characterized as: (1) occurrence of slip lines or bands on partial α grains, (2) nucleation of micro-cracks within some α grains, (3) coalescence of micro-cracks and formation of granular bright facets, (4) stable macro-crack growth within fisheye (5) unstable crack growth outside fisheye and (6) momentary fracture. The validity of approach is confirmed by the good agreement between predicted and experimental results.",

keywords = "Granular bright facets, Nucleation and growth, TC4 titanium alloy, Theory and modeling, Very high cycle fatigue",

author = "Wei Li and Hongqiao Zhao and Abdelhak Nehila and Zhenyu Zhang and Tatsuo Sakai",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd",

year = "2017",

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doi = "10.1016/j.ijfatigue.2017.08.004",

language = "English",

volume = "104",

pages = "342--354",

journal = "International Journal of Fatigue",

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TY - JOUR

T1 - Very high cycle fatigue of TC4 titanium alloy under variable stress ratio

T2 - Failure mechanism and life prediction

AU - Li, Wei

AU - Zhao, Hongqiao

AU - Nehila, Abdelhak

AU - Zhang, Zhenyu

AU - Sakai, Tatsuo

PY - 2017/11

Y1 - 2017/11

N2 - Axial loading tests with variable stress ratio were performed to investigate the very high cycle fatigue property of TC4 titanium alloy, and a life prediction approach associated with failure mechanism was proposed. The interior failure process is characterized as: (1) occurrence of slip lines or bands on partial α grains, (2) nucleation of micro-cracks within some α grains, (3) coalescence of micro-cracks and formation of granular bright facets, (4) stable macro-crack growth within fisheye (5) unstable crack growth outside fisheye and (6) momentary fracture. The validity of approach is confirmed by the good agreement between predicted and experimental results.

AB - Axial loading tests with variable stress ratio were performed to investigate the very high cycle fatigue property of TC4 titanium alloy, and a life prediction approach associated with failure mechanism was proposed. The interior failure process is characterized as: (1) occurrence of slip lines or bands on partial α grains, (2) nucleation of micro-cracks within some α grains, (3) coalescence of micro-cracks and formation of granular bright facets, (4) stable macro-crack growth within fisheye (5) unstable crack growth outside fisheye and (6) momentary fracture. The validity of approach is confirmed by the good agreement between predicted and experimental results.

KW - Granular bright facets

KW - Nucleation and growth

KW - TC4 titanium alloy

KW - Theory and modeling

KW - Very high cycle fatigue

UR - https://www.scopus.com/pages/publications/85026898270

U2 - 10.1016/j.ijfatigue.2017.08.004

DO - 10.1016/j.ijfatigue.2017.08.004

M3 - Article

AN - SCOPUS:85026898270

SN - 0142-1123

VL - 104

SP - 342

EP - 354

JO - International Journal of Fatigue

JF - International Journal of Fatigue

ER -

Very high cycle fatigue of TC4 titanium alloy under variable stress ratio: Failure mechanism and life prediction

Abstract

Keywords

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