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Strain Rate Sensitivity of Ti-6Al-4V and Inconel 718 and its Interaction with Fatigue Performance at Different Speeds

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2020, Master of Science (MS), Ohio University, Mechanical Engineering (Engineering and Technology).
Fatigue failures are sudden and catastrophic, and for critical parts must be prevented through proper design. Fatigue testing of materials yields data critical for proper design but takes large spans of testing time to complete with conventional methods. Therefore, high speed fatigue testing that produces quality data is advantageous for reducing costs and time. However, it has been shown that testing speeds may affect material performance, both in static tensile testing and dynamic fatigue testing. The effect of strain rate on material performance in static tensile testing and how it relates to fatigue testing performance at commensurate strain rates was the primary objective for this thesis work for sheet Ti-6Al-4V and Inconel 718. Implementing a vibration-driven, fully reversed bending fatigue test protocol leveraging high speed testing capability, a comparable forced displacement bending fatigue test protocol, and a high speed tensile test protocol implementing Digital Image Correlation (DIC), stress versus strain data and S-N curve data was acquired to examine two strain-rates of fatigue and tensile testing. Higher ultimate tensile strengths were observed in high strain rate tests as compared to low strain rate tests, 4.23% higher for Ti-6Al-4V and 1.91% for Inconel 718. Ti-6Al-4V exhibited higher fatigue strength in high speed tests than low speed, but Inconel 718 exhibited lower fatigue strength at high speeds as compared to low speeds.
Timothy Cyders, Dr. (Advisor)
Brian Wisner, Dr. (Committee Member)
Young David, Dr. (Committee Member)
95 p.

Recommended Citations

Citations

  • Juratovac, J. M. (2020). Strain Rate Sensitivity of Ti-6Al-4V and Inconel 718 and its Interaction with Fatigue Performance at Different Speeds [Master's thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1605875502029283

    APA Style (7th edition)

  • Juratovac, Joseph. Strain Rate Sensitivity of Ti-6Al-4V and Inconel 718 and its Interaction with Fatigue Performance at Different Speeds. 2020. Ohio University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1605875502029283.

    MLA Style (8th edition)

  • Juratovac, Joseph. "Strain Rate Sensitivity of Ti-6Al-4V and Inconel 718 and its Interaction with Fatigue Performance at Different Speeds." Master's thesis, Ohio University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1605875502029283

    Chicago Manual of Style (17th edition)