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Full-Field Measurement of the Taylor-Quinney Coefficient in Tension Tests of Ti-6Al-4V, Aluminum 2024-T351, and Inconel 718 at Various Strain Rates

Smith, Jarrod L
http://rave.ohiolink.edu/etdc/view?acc_num=osu1546452653747728

Abstract Details

2019, Doctor of Philosophy, Ohio State University, Mechanical Engineering.
During plastic deformation of metals only a portion of the plastic work done on the material is expended to modify its physical properties while the remaining energy is converted to heat. The associated rise in temperature during deformation can affect the mechanical response of the material (e.g. strain hardening, thermal softening, precipitating localizations, etc.). At low strain rates the conditions are virtually isothermal as there is sufficient time for the heat to transfer to the surroundings. At high strain rates the temperature in the metal can increase significantly and the conditions can become nearly adiabatic as the heat cannot dissipate to the surroundings. The portion of plastic work that is converted to heat is determined by the Taylor-Quinney coefficient (β) and is quantified by measuring both the plastic work and temperature rise in a material during deformation. By including the Taylor-Quinney coefficient, complex material models can more accurately model the thermoplastic deformation of the material over a wide range of strains, strain rates, and temperatures. An experimental program is introduced to investigate the dependence of the Taylor-Quinney coefficient on strain rate and strain. Tension tests with specimens made of Ti-6Al-4V, Aluminum 2024-T351, and Inconel 718 are performed at various strain rates ranging from 1E-4 to 6000 sˉ¹. The quasi-static tests are completed on a hydraulic load frame while tests ranging from 500 to 6000 sˉ¹ are completed using the split- iii Hopkinson bar (SHB) technique. Flat thin tensile specimens are used where strain is measured on one side of the specimen using 2D or 3D Digital Image Correlation (DIC) and simultaneous temperature measurements are recorded on the opposite side of the specimen via infrared thermography. A method to determine β by combining the full-field temperature and strain measurements together with the recorded force data is developed. The dependence of β on plastic strain and strain rate is determined.
Amos Gilat (Advisor)
Rebecca Dupaix (Committee Member)
Prasad Mokashi (Committee Member)
Soheil Soghrati (Committee Member)
108 p.
Mechanical Engineering
Dynamic Material Model; Plasticity; Infrared; Digital Image Coorelation; Taylor-Quinney; Inelastic Heat Function; Mechanical Engineering; Strain Measurement; Temperature Measurement;

Recommended Citations

Citations

  • Smith, J. L. (2019). Full-Field Measurement of the Taylor-Quinney Coefficient in Tension Tests of Ti-6Al-4V, Aluminum 2024-T351, and Inconel 718 at Various Strain Rates [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1546452653747728

    APA Style (7th edition)

  • Smith, Jarrod. Full-Field Measurement of the Taylor-Quinney Coefficient in Tension Tests of Ti-6Al-4V, Aluminum 2024-T351, and Inconel 718 at Various Strain Rates. 2019. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1546452653747728.

    MLA Style (8th edition)

  • Smith, Jarrod. "Full-Field Measurement of the Taylor-Quinney Coefficient in Tension Tests of Ti-6Al-4V, Aluminum 2024-T351, and Inconel 718 at Various Strain Rates." Doctoral dissertation, Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1546452653747728

    Chicago Manual of Style (17th edition)

osu1546452653747728
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This open access ETD is published by The Ohio State University and OhioLINK.