Metals and AlloysNo Access

Dwell-fatigue crack growth mechanisms of titanium alloy Ti-6Al-4V at room-temperature

School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212014, P. R. China

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Xiaopeng Sun

School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212014, P. R. China

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Yongzheng Li

School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212014, P. R. China

E-mail Address: justyzli@163.com

Corresponding author.

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Pengyu Wei

China Ship Scientific Research Centre, Wuxi 214082, P. R. China

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Jiarui Liu

China Ship Scientific Research Centre, Wuxi 214082, P. R. China

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Chao Bian

School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212014, P. R. China

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Shixing Zhang

School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212014, P. R. China

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, and

Xiangyu Huang

School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212014, P. R. China

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https://doi.org/10.1142/S0217979220400330Cited by:0 (Source: Crossref)

This article is part of the issue:

SPECIAL ISSUE — MMPD 2019

Abstract

Ti-6Al-4V alloy is widely used for the deep-sea manned submersible. In addition to the normal cyclic loading, the manned cabin will experience a period of dwell time in each cycle during their service life. In this research, the fatigue and dwell-fatigue crack growth behavior of Ti-6Al-4V alloy under different dwell time were studied experimentally. The mechanism of dwell-fatigue crack growth was investigated. The acceleration phenomenon of the dwell-fatigue crack growth can be directly observed in the experiment. The relationship between the crack length and the dwell time was captured under different $Δ K$ $Δ K$ within one cycle. The results presented that there is a saturation time for the dwell-fatigue crack growth. A prediction model is proposed to predict the dwell-fatigue crack growth behavior considering the effects of dwell time.

Keywords:

PACS: 62.20.me, 62.20.mm, 62.20.mt

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