Banca de QUALIFICAÇÃO: LUAN DE MORAES PEREIRA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : LUAN DE MORAES PEREIRA
DATE: 27/10/2023
TIME: 14:00
LOCAL: Sala 302 do Bloco B do Campus de Santo André da Universidade Federal do ABC
TITLE:

ATOMISTIC SIMULATIONS APPLIED TO THE STUDY OF ADDITIVE MANUFACTURING BY COLD SPRAY

PAGES: 104
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Metalurgia Física
SPECIALTY: Propriedades Mecânicas dos Metais e Ligas
SUMMARY:

Cold Spray is a technique for creating coatings and additive manufacturing by propelling and adhering particles onto a substrate. The mechanisms resulting in this adhesion are not fully understood, and due to experimental challenges related to time and velocities, its investigation primarily relies on simulations. In this work, we employed Molecular Dynamics to gain an atomistic insight into the particle adhesion process. Diverging from the three-dimensional systems found in the literature, we developed and validated a quasi-2D system. This system allowed us to simulate particles of approximately 0.2 micrometers, close to the experimental scale. The variation in particle sizes revealed the need for larger models than those previously existing in the literature. Furthermore, we investigated the role of material amorphization at the onset of jetting. The study of shock waves in the 0.2 μm system revealed that the shock wave is not responsible for jetting formation but plays a role in the deformation process, ultimately leading to jetting formation. Temperature was found to be a crucial factor in the jetting process, leading to material instability and amorphization, both essential for jetting to occur. This temperature results from deformations, dislocation interactions, and shear bands. These factors together elucidated various aspects of the adhesion and jetting formation process, becoming sources of discussion in the literature. Additionally, based on this quasi-2D model, further investigations are being prepared for a deeper understanding of the process.

COMMITTEE MEMBERS:
Presidente - Interno ao Programa - 1671298 - RENATO ALTOBELLI ANTUNES
Membro Titular - Examinador(a) Interno ao Programa - 2073298 - ERIK GUSTAVO DEL CONTE
Membro Titular - Examinador(a) Interno ao Programa - 1309493 - PEDRO ALVES DA SILVA AUTRETO
Membro Titular - Examinador(a) Externo ao Programa - 1765425 - MARCIO GUSTAVO DI VERNIERI CUPPARI
Membro Suplente - Examinador(a) Interno ao Programa - 1671292 - SYDNEY FERREIRA SANTOS
Membro Suplente - Examinador(a) Interno ao Programa - 1760410 - JEVERSON TEODORO ARANTES JUNIOR
Membro Suplente - Examinador(a) Externo ao Programa - 1925199 - ANIBAL DE ANDRADE MENDES FILHO
Membro Suplente - Examinador(a) Externo ao Programa - 3068039 - MOHAMMAD MASOUMI