ULTRA-HIGH STRAIN RATE CONSTITUTIVE MODELING OF PURE TITANIUM USING PARTICLE IMPACT TEST

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.

Name thesis:degree_name

M.S., Mechanical Engineering

Level thesis:degree_level

Master of Science

Discipline thesis:degree_discipline

Mechanical Engineering

Grantor

Cornell University

Year dc:date.issued

2020

Author dc:creator

• Wang, Xuchen

Committee member dc:contributor.committeemember

• Zehnder, Alan

• Constitutive Modeling
• Impact
• Johnson-Cook
• Titanium
• Ultra-High Strain Rate
• Zerilli-Armstrong

Statement dc:rights

• Attribution 4.0 International

Licence dc:rights.uri

• https://creativecommons.org/licenses/by/4.0/

Language dc:language.iso

en

DOI

https://doi.org/10.7298/0nsp-3e86

Dc Identifier Other

ProQuest Submission ID: 10914
ProQuest Publication ID: 27994415

OAI identifier oai:identifier

oai:ecommons.cornell.edu:1813/70323