Analysis of the residual stresses in stamped valves by X-ray diffraction and finite element method / Analise de tensões residuais em valvulas estampadas por meio da difração de raios-X e do metodo de elementos finitos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

The continuous development of engineering materials, the new manufacturing processes, and the more complex mechanical parts have required constandy improvement of techniques and methods able to make analyses fast and easy. Metal forming with dimensional changes by plastic deformation results internal stresses, named residual stresses, which can significandy a:ffect the mechanical performance of parts and systems. The main objective of this work is to develop a method to analyze the residual stresses in stamped dynamical valves by X-ray diffraction and by the finite element method. In this context it was developed a sin2", alterna tive method based on the method common1y applied to the determination of residual stresses in metallic thin fUms. The results obtained from X-ray diffraction are coherent to those obtained in the stamping processes and in the simulation by the finite element method. These results were also compared to results from fatigue tests carried out with a laboratory bench (cantilever alterna te reversed bending) with dynamic valves in the conditions: a) as blanked , b) blanked and plastica11y deformed on the regions subjected to high 10005, and c) blanked, plastica11y deformed and grinded to eliminate potential dangerous regions as revea1ed in the simulation. The results obtained in the fatigue tests confumed the validity of the methods applied in this work to analyze the residual stresses

ASSUNTO(S)

tensões residuais raios x - difração x-ray metodo dos elementos finitos deformação plastica stamping residual stresses finite element method

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