Tension-tension fatigue behaviours of notched freestanding pure Ti foils with different thicknesses

Meiqi Yao; Hongyang Wang; Yi Zhao; Jiangbo Sha

doi:10.1016/j.ijfatigue.2018.05.009

Tension-tension fatigue behaviours of notched freestanding pure Ti foils with different thicknesses

Meiqi Yao, Hongyang Wang, Yi Zhao, Jiangbo Sha^*

^*Corresponding author for this work

Beihang University

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

2 Citations (Scopus)

Abstract

This work addresses the mode I fatigue crack propagation behaviours of pure Ti foils using freestanding notched rectangular specimens under tension-tension cyclic loading. Compared to the 50-μm-thick foil, the 30-μm-thick foil exhibited a higher yield strength (σ_y) but a lower fracture toughness (K_Q) and fatigue life (N_f) for the same loading conditions. The Paris constant m decreased from 5.12 to 4.45, when the foil thickness increased from 30 μm to 50 μm. The incomplete self-similarity parameter Z at the crack tip was found to be higher in the 30-μm-thick foils, resulting in a higher Paris constant m than that in the 50-μm-thick foils.

Original language	English
Pages (from-to)	65-73
Number of pages	9
Journal	International Journal of Fatigue
Volume	114
DOIs	https://doi.org/10.1016/j.ijfatigue.2018.05.009
Publication status	Published - Sept 2018
Externally published	Yes

Keywords

Effective stress intensity factor
Failure analysis
Fatigue crack growth
Tensile loading
Titanium alloys

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10.1016/j.ijfatigue.2018.05.009

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title = "Tension-tension fatigue behaviours of notched freestanding pure Ti foils with different thicknesses",

abstract = "This work addresses the mode I fatigue crack propagation behaviours of pure Ti foils using freestanding notched rectangular specimens under tension-tension cyclic loading. Compared to the 50-μm-thick foil, the 30-μm-thick foil exhibited a higher yield strength (σy) but a lower fracture toughness (KQ) and fatigue life (Nf) for the same loading conditions. The Paris constant m decreased from 5.12 to 4.45, when the foil thickness increased from 30 μm to 50 μm. The incomplete self-similarity parameter Z at the crack tip was found to be higher in the 30-μm-thick foils, resulting in a higher Paris constant m than that in the 50-μm-thick foils.",

keywords = "Effective stress intensity factor, Failure analysis, Fatigue crack growth, Tensile loading, Titanium alloys",

author = "Meiqi Yao and Hongyang Wang and Yi Zhao and Jiangbo Sha",

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journal = "International Journal of Fatigue",

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T1 - Tension-tension fatigue behaviours of notched freestanding pure Ti foils with different thicknesses

AU - Yao, Meiqi

AU - Wang, Hongyang

AU - Zhao, Yi

AU - Sha, Jiangbo

PY - 2018/9

Y1 - 2018/9

N2 - This work addresses the mode I fatigue crack propagation behaviours of pure Ti foils using freestanding notched rectangular specimens under tension-tension cyclic loading. Compared to the 50-μm-thick foil, the 30-μm-thick foil exhibited a higher yield strength (σy) but a lower fracture toughness (KQ) and fatigue life (Nf) for the same loading conditions. The Paris constant m decreased from 5.12 to 4.45, when the foil thickness increased from 30 μm to 50 μm. The incomplete self-similarity parameter Z at the crack tip was found to be higher in the 30-μm-thick foils, resulting in a higher Paris constant m than that in the 50-μm-thick foils.

AB - This work addresses the mode I fatigue crack propagation behaviours of pure Ti foils using freestanding notched rectangular specimens under tension-tension cyclic loading. Compared to the 50-μm-thick foil, the 30-μm-thick foil exhibited a higher yield strength (σy) but a lower fracture toughness (KQ) and fatigue life (Nf) for the same loading conditions. The Paris constant m decreased from 5.12 to 4.45, when the foil thickness increased from 30 μm to 50 μm. The incomplete self-similarity parameter Z at the crack tip was found to be higher in the 30-μm-thick foils, resulting in a higher Paris constant m than that in the 50-μm-thick foils.

KW - Effective stress intensity factor

KW - Failure analysis

KW - Fatigue crack growth

KW - Tensile loading

KW - Titanium alloys

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DO - 10.1016/j.ijfatigue.2018.05.009

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SN - 0142-1123

VL - 114

SP - 65

EP - 73

JO - International Journal of Fatigue

JF - International Journal of Fatigue

ER -

Tension-tension fatigue behaviours of notched freestanding pure Ti foils with different thicknesses

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Keywords

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