dc.contributor.author |
Hamieh, Abdo Mohamad, |
dc.date.accessioned |
2018-10-11T11:37:00Z |
dc.date.available |
2018-10-11T11:37:00Z |
dc.date.issued |
2017 |
dc.date.submitted |
2017 |
dc.identifier.other |
b21053868 |
dc.identifier.uri |
http://hdl.handle.net/10938/21386 |
dc.description |
Thesis. M.E. American University of Beirut. Department of Mechanical Engineering, 2017. ET:6727$Advisor : Dr. Mu’tasem Shehadeh, Associate Professor, Mechanical Engineering ; Members of Committee : Dr. Samir Mustapha, Assistant Professor, Mechanical Engineering ; Dr. Kamel Abu Ghali, Professor, Mechanical Engineering. |
dc.description |
Includes bibliographical references (leaves 45-48) |
dc.description.abstract |
Multiscale Dislocation Dynamics Plasticity (MDDP) simulations are carried out to investigate the mechanical response of Aluminum single crystals subjected to extreme conditions. The effects of temperature and strain rate on the dynamic yield point are studied in details. In doing so, an atomistically informed generalized dislocation mobility law is incorporated in MDDP. Additionally, pressure and temperature dependent elastic properties are employed to better capture the shockwave characteristics at elevated temperatures. The simulation results reveal unusual thermal hardening effect along with strain rate hardening behavior. Based on the simulations’ findings, a physically based constitutive equation for the dynamic yield strength is proposed. Moreover, we have conducted detailed analyses of the dislocation microstructural evolution and a dislocation density evolution model is presented. |
dc.format.extent |
1 online resource (48 leaves) : color illustrations |
dc.language.iso |
eng |
dc.subject.classification |
ET:006727 |
dc.subject.lcsh |
Dislocations in crystals.$Crystals -- Mechanical properties.$Shock (Mechanics)$Shock waves.$Aluminum.$Materials science. |
dc.title |
Deformation mechanisms in aluminum single crystal : multi-scale dislocation dynamics analyses - |
dc.type |
Thesis |
dc.contributor.department |
Maroun Semaan Faculty of Engineering and Architecture.$Department of Mechanical Engineering, |
dc.contributor.institution |
American University of Beirut. |