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Master's Dissertation
DOI
https://doi.org/10.11606/D.85.2011.tde-16062011-162345
Document
Author
Full name
Rene Ramos de Oliveira
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2011
Supervisor
Committee
Lima, Nelson Batista de (President)
Barrios, Daniel Benitez
Couto, Antonio Augusto
Title in Portuguese
Avaliação da tensão residual em alumínio 7050 conformado pelo  processo peen forming
Keywords in Portuguese
difração de raios-x
peen forming
shot peening
tensão residual
Abstract in Portuguese
O tratamento superficial de shot peening tem por objetivo aumentar a resistência à fadiga sendo comparada pelas medidas de tensão residual. O processo peen forming é uma variante do processo shot peening onde se obtém uma curvatura na placa produzida pelo jateamento das esferas através da compressão dos grãos localizados próximos à superfície. Foi estudado neste trabalho a influência dos parâmetros pressão e tamanho de granalha, utilizado no processo de peen forming, no perfil de tensão residual e no raio de curvatura em amostras de alumínio 7050. A avaliação do perfil de tensão de residual foi efetuada por difração de raios-x utilizando o método de sen2 . Os resultados mostram que a formação da altura do arco de curvatura é proporcional a pressão de jateamento e ao tamanho das esferas e inversamente proporcional a espessura da amostra, e que o fator de concentração de tensões é maior para amostras jateadas com menores esferas. Na seção final deste trabalho apresenta um estudo complementar sobre microdeformação e tamanho médio de cristalito, podendo avaliar o perfil das amostras após jateamento.
Title in English
Residual stress evaluation and curvature behavior of aluminun 7050 peen forming processed
Keywords in English
peen forming
residual stress
shot peening
x-ray diffraction
Abstract in English
Shot peening is a superficial cold work process used to increase the fatigue life evaluated by residual stress measurements. The peen forming process is a variant of the shot peening process, where a curvature in the plate is obtained by the compression of the grains near to the surface. In this paper, the influence of the parameters such as: pressure of shot, ball shot size and thickness of aluminum 7050 samples with respect to residual stress profile and resulting arc height was studied. The evaluation of the residual stress profile was obtained by sin2 method. The results show that the formation of the curvature arc height is proportional to the shot peening pressure, of spheres size and inversely proportional to the thickness of the sample, and that stress concentration factor is larger for samples shot peened with small balls. On final of this paper presents an additional study on microstrain and average crystallite size, which can evaluate the profile of the samples after blasting.
 
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Publishing Date
2011-06-22
 
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