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Master's Dissertation
DOI
https://doi.org/10.11606/D.3.2005.tde-19042024-110436
Document
Author
Full name
Fábio Benassi
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2005
Supervisor
Committee
Alves, Marcilio (President)
Kurka, Paulo Roberto Gardel
Marcicano, João Paulo Pereira
Title in Portuguese
Modulação de pulso para regularização da taxa de deformação em teste com barra de Hopkinson.
Keywords in Portuguese
Deformação e estresses
Ensaios físicos
Propriedades dos materiais
Abstract in Portuguese
O presente trabalho propõe-se a apresentar um método para dimensionamento de moduladores de pulso para uso em testes de barra de Hopkinson. Moduladores de pulso têm larga aplicação não apenas na eliminação dos efeitos de dispersão, mas também como ferramentas para regularização da taxa de deformação do teste. Visando esta segunda aplicação, o texto traz uma fundamentação teórica sobre o cálculo e estabelece linhas gerais para o dimensionamento de moduladores a partir de simulações numéricas. A análise apresenta exemplos de cálculo e resultados para o caso concreto da barra de Hopkinson do Grupo Mecânica dos Sólidos e Impacto em estruturas da Escola Politécnica da Universidade de São Paulo. Os resultados comprovam a eficácia do método de dimensionamento e ilustram os benefícios da modulação de pulso.
Title in English
Untitled in english
Keywords in English
Deformation and stress
Material properties
Physical tests
Abstract in English
This dissertation's goal is to establish design guidelines for the design of incident pulse shapers in Split Hopkinson Pressure Bar tests. Pulse shapers can not only reduce the effects of dispersion by increasing the rise time but can also serve the purpose of attaining constant strain rates when testing samples subject to strain hardening. With the latter goal in mind the text presents a theoretical background about the workings of pulse shapers and outlines a step-by-step procedure of how to design them. Computer simulations show the effectiveness of the so-designed shapers taking as a testbed the Hopkinson bar apparatus belonging to the University of São Paulo's Group of Solid Mechanics and Structural Impact of the Department of Mechatronics and Mechanical Systems Engineering. The results confirm the effectiveness of the guidelines and illustrate the benefits of the pulse shaping technique.
 
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FabioBenassi.pdf (2.90 Mbytes)
Publishing Date
2024-04-25
 
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