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JOURNAL OF MECHANICAL ENGINEERING  > 2020  >  34(5): 738-745.
WANG Ke, WU Li, LI Yong-zheng, SUN Xiao-peng. Study on the Overload and Dwell-Fatigue Property of Titanium Alloy in Manned Deep Submersible[J]. JOURNAL OF MECHANICAL ENGINEERING, 2020, 34(5): 738-745. doi: 10.1007/s13344-020-0067-8
Citation: WANG Ke, WU Li, LI Yong-zheng, SUN Xiao-peng. Study on the Overload and Dwell-Fatigue Property of Titanium Alloy in Manned Deep Submersible[J]. JOURNAL OF MECHANICAL ENGINEERING, 2020, 34(5): 738-745. doi: 10.1007/s13344-020-0067-8
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Study on the Overload and Dwell-Fatigue Property of Titanium Alloy in Manned Deep Submersible

doi: 10.1007/s13344-020-0067-8
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  • Corresponding author: LI Yong-zheng, E-mail: 675010149@qq.com
  • Received Date: 05 Nov 2019
  • Rev Recd Date: 11 Jun 2020
  • Accepted Date: 22 Jul 2020
    • Available Online: 12 May 2021
  • Publish Date: 10 Dec 2020
    Abstract
  • With the rapid development of ocean technology, the deep-sea manned submersible is regarded as a high-tech equipment for the exploration and exploitation of ocean resources. The safety of manned cabin has a decisive effect on the whole system. Ti-6Al-4V with the superior strength-to-weight ratio and corrosion resistance has been used for the manned cabin. The manned cabin experiences loading spectrum with different maximum stresses and different dwell time during their service life. The load sequence effects on dwell fatigue crack growth behavior of Ti-6Al-4V under different dwell time are investigated experimentally in this paper. The experimental results show that the crack tip plastic zone is enlarged by the dwell time and the overload retardation zone increases with dwell time under the same overload rate. A dwell fatigue crack growth model is proposed by modifying the crack tip plastic zone under the loading history with combinations of the single overload and dwell time factors are included in the modified model. Based on the experimental data, the overload retardation zone and the crack growth rates of Ti-6Al-4V are predicted by the modified model. A reasonable model for the load sequence effect on the dwell fatigue crack growth rates of Ti-6Al-4V is verified.

     

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