About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Dynamic Behavior of Materials IX
|
Presentation Title |
Using Full-field Strain and Temperature Measurements to Determine the Taylor-Quinney Coefficient in Tensile Split Hopkinson Bar Tests |
Author(s) |
Amos Gilat, Jarrod Smith, Jermy Seidt |
On-Site Speaker (Planned) |
Amos Gilat |
Abstract Scope |
Plastic deformation generates heat and the Taylor-Quinney coefficient (Beta) is the ratio between the energy dissipated as heat and the overall work invested in producing the deformation. Knowing the value of Beta is important for accurate modeling of plastic deformation since temperature rise may offset increase in stress due to strain hardening and may affect strain rate sensitivity. New tensile testing for determining the value of Beta is presented. Full field strain measurements (DIC) and temperature (IR) throughout the test (including in the necking region) are used to determine Beta as a function of strain at various strain rates, including high strain rates (split Hopkinson bar). Results from tests of Inconel 718 specimens show strains in the necking region exceeding 0.4 and temperature rises of about 200C, The value of the Beta increases with strain and reaches a plateau value of about 0.85 at strain of about 0.3. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Other, Other |