2026-09-19T05:12:06Zhttps://ecommons.cornell.edu/server/oai/requestoai:ecommons.cornell.edu:1813/703232026-05-15T19:41:46Zcom_1813_35col_1813_47
Wang, Xuchen
Hassani Gangaraj, Seyyed Mostafa
Zehnder, Alan
2020-08-10T20:08:05Z
2020-08-10T20:08:05Z
2020-05
ProQuest Submission ID: 10914
ProQuest Publication ID: 27994415
https://hdl.handle.net/1813/70323
https://doi.org/10.7298/0nsp-3e86
13254434
41 pages
With the advent of advanced testing strategies like laser-induced particle impact test, it is possible to study materials mechanics under extremely high deformation rates, i.e., above 10^6 s^-1, a relatively less explored regime of strain rates. In this study, we accelerate microparticles of commercially pure titanium to ~100 m/s towards a rigid substrate and record their deformation upon impact in real time. We also conduct finite element modeling of the experimentally recorded impacts using two constitutive equations: Johnson-Cook and Zerilli-Armstrong. We show that titanium microparticles experience strain rates in the range of 10^6-10^10 s^-1 upon impact. We evaluate the capability of the Johnson-Cook and Zerilli-Armstrong equations in predicting material response at ultra-high strain rates. With an optimization-based constitutive modeling approach, we also propose updated strain rate-related constitutive parameters for both equations that can improve the extent to which they can successfully describe the deformation of materials at higher strain rates.
en
Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/
Constitutive Modeling
Impact
Johnson-Cook
Titanium
Ultra-High Strain Rate
Zerilli-Armstrong
ULTRA-HIGH STRAIN RATE CONSTITUTIVE MODELING OF PURE TITANIUM USING PARTICLE IMPACT TEST
dissertation or thesis
https://catalog.library.cornell.edu/catalog/13254434
application/pdf
Mechanical Engineering
Cornell University
Master of Science
M.S., Mechanical Engineering
https://hdl.handle.net/1813/59810
Publication
Cornell Theses and Dissertations
Wang, Xuchen
5893a6ea-7af3-41d7-abc6-04bcd26ab5df
open.access
open.access
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<Abstract>With the advent of advanced testing strategies like laser-induced particle impact test, it is possible to study materials mechanics under extremely high deformation rates, i.e., above 10^6 s^-1, a relatively less explored regime of strain rates. In this study, we accelerate microparticles of commercially pure titanium to ~100 m/s towards a rigid substrate and record their deformation upon impact in real time. We also conduct finite element modeling of the experimentally recorded impacts using two constitutive equations: Johnson-Cook and Zerilli-Armstrong. We show that titanium microparticles experience strain rates in the range of 10^6-10^10 s^-1 upon impact. We evaluate the capability of the Johnson-Cook and Zerilli-Armstrong equations in predicting material response at ultra-high strain rates. With an optimization-based constitutive modeling approach, we also propose updated strain rate-related constitutive parameters for both equations that can improve the extent to which they can successfully describe the deformation of materials at higher strain rates.</Abstract>
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