Banca de DEFESA: JONAS MEDEIROS DE AZEVEDO BARBOSA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JONAS MEDEIROS DE AZEVEDO BARBOSA
DATE: 15/12/2023
TIME: 09:00
LOCAL: Sala de CAx do Laboratório de Manufatura, Núcleo de Tecnologia Insustrial
TITLE:

Analysis of punching of Ferrite-Bainite (FB590) AHSS at room and cryogenic temperatures

KEY WORDS:

FB590 Steel, cryogenic punching, digital image correlation, numerical simulation, finite element method

PAGES: 104
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUBÁREA: Processos de Fabricação
SPECIALTY: Matrizes e Ferramentas
SUMMARY:

Advanced High Strength Steels (AHSS) have been used for vehicular structures aiming for mass reduction with a feasible balance between mechanical resistance and formability in manufacturing processes. Those steels are commonly supplied in thin sheets and must be manufactured typically by forming processes to define the product shape, and punching is one of the critical operations. The AHSS Ferrite-Bainite (FB) stands out for having high local formability, allowing structural reinforcements like flanges to be obtained. Furthermore, processing AHSS involves high strength and plastic elongation values, and the material’s behavior changes during the operation due to processing parameters such as die clearance, punch geometry, and temperature. Models to evaluate the effects of operations above room temperature are available in the literature, but there is a lack of studies at cryogenic temperatures. This research aims to simulate the behavior of the AHSS FB590 material at room and cryogenic temperatures to analyze the ductile-brittle transition effects at the cutting edge. A methodology to obtain values of triaxiality and plastic strain needed for calibration of the constitutive models was developed using digital image correlation (DIC) to determine the fracture moment. The hole expansion simulations showed that an increment of 4.7 mm on the final diameter can be obtained by changing the previous punching operation from room to cryogenic temperature.

COMMITTEE MEMBERS:
Presidente - 1792669 - ADILSON JOSÉ DE OLIVEIRA
Interno - 1938946 - NICOLAU APOENA CASTRO
Externo ao Programa - 1451488 - JOÃO CARLOS ARANTES COSTA JÚNIOR - UFRNExterno à Instituição - JETSON LEMOS FERREIRA - Arcelor