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Master's Dissertation
DOI
https://doi.org/10.11606/D.3.2008.tde-01102008-180230
Document
Author
Full name
Ronaldo de Souza Moraes Junior
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2008
Supervisor
Committee
González Lima, Raúl (President)
Benítez Barrios, Daniel
Schön, Cláudio Geraldo
Title in Portuguese
Verificação do projeto estrutural de uma máquina de ensaio de fadiga de cadeira de rodas.
Keywords in Portuguese
Cadeiras de rodas
Ensaios de fadiga
Método dos elementos finitos
Abstract in Portuguese
Para realizar ensaios de fadiga, é preciso que a máquina ou equipamento de testes tenha uma durabilidade muito maior que as estruturas ou componentes a serem ensaiados. O presente trabalho propõe-se a investigar a estrutura de uma máquina de ensaio de fadiga de cadeira de rodas, com o objetivo de determinar sua vida em fadiga. Para isto, uma análise da interação entre cadeira de rodas e máquina de ensaio é feita, do ponto de vista dinâmico, através de dados experimentais e modelagem em elementos finitos. A máquina de ensaio é constituída por uma estrutura com dois tambores rotativos, que possuem ressaltos, e suportam as rodas da cadeira de rodas. Estimada a força no tempo que a cadeira exerce sobre os tambores, calculam-se as tensões na estrutura, identificam-se as regiões de maiores tensões e estima-se a vida em fadiga da estrutura.
Title in English
Verification of the structural design of a wheelchairs fatigue testing machine.
Keywords in English
Dynamic response
Fatigue life
Finite elements
Rainflow
S-N Curve
Stress history
Abstract in English
Fatigue analysis of full-scale structures and components is possible by using appropriated devices and machines which has to be much more durable than the structures or components being tested. The present work is proposed to investigate the structure of a wheelchair fatigue testing machine and predict its fatigue life. To reach this goal a dynamic analysis based on experimental data combined with the finite element method of the testing machine and wheelchair interaction is done. The machine is made of a structure and two turning drums that have slats and support the wheelchairs. With the timedependent force that wheelchair applies to the drums, the stresses are calculated to the whole structure, the sites with higher stresses are identified and the fatigue life of the structure is predicted.
 
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Publishing Date
2008-10-08
 
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