Análise numérica e experimental dos efeitos da não-uniformidade da espessura em cascas finas cilíndricas rotativas. / Numerical and experimental analysis of the thickness non-uniformity effects in rotating circular cylindrical shells.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Circular cylindrical shells with small thickness variations along their body, when submitted to rotation, present, in some cases, elastic displacements of their outside surface induced by centrifugal forces leading to final oval like shapes. The main purpose of this study is to establish relationships between thickness variation of the cylindrical shells with their measured deformation during the rotation, due to centrifugal forces, using two approaches, one experimental and the other one numerical, in the latter case the finite element method (FEM). The studied cylindrical shells had their wall thickness measured by means of an ultrasound device. The used material is flake graphite cast iron (gray cast iron). The graphite flakes act as reflectors, what makes such measurements imprecise. The numerical results found are satisfactory in a qualitative way, but they disagree in the quantitative form. Shell models with theoretical imperfections also were created and analyzed using the finite element method in order to evaluate the behavior of the cylindrical shell under several configurations of distribution of the shell thickness variation. Further research is necessary on new technologies to measure the thickness of pieces manufactured of flake graphite cast iron. In this research, the oval shape measurements were done by means of eddy-current proximity sensors.

ASSUNTO(S)

cylindrical shells thickness variation flake graphite cast iron variação de espessura ultrasound ferro fundido cinzento ultra-som análise experimental elementos finitos cascas cilíndricas experimental analysis finite elements method

ACESSO AO ARTIGO

Documentos Relacionados