Estudo experimental de tensões residuais aplicados em superfícies usinadas em elementos de máquinas
This thesis is structured based on consolidated results and organized from five articles produced during the period of scientific investigation. Initially, an Interlaboratory study was carried out in order to understand the possible sources of measurement uncertainty and to create a methodology f...
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| Formato: | doctoralThesis |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/49882 |
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| Resumo: | This thesis is structured based on consolidated results and organized from five articles
produced during the period of scientific investigation. Initially, an Interlaboratory
study was carried out in order to understand the possible sources of measurement
uncertainty and to create a methodology for reliable quantification by the X-ray
diffraction technique using an Ishikawa diagram; going through an investigation on
the influence of the mechanical properties of the materials and interferences that each
phase acts on the measurements of the residual stresses in experiments with analysis
of AISI 316L steel and duplex steel (austeno-ferritic); The thesis is not limited only to
the development of the methodology but also to practical applications for assessing
the tribological behavior of mechanical components and studies on better machining
conditions. The study of residual stresses has huge importance for the evaluation of a
component or engineering structure, considering that all manufacturing processes
promote a new condition of this elastic response. One of the studies evaluated the
influence of turning conditions on residual stresses in AISI 1045 steel. Another article
evaluated the effects of different grades of carbide coatings and lubrication cooling
techniques on tool life and surface residual stress. milled HCWCI; Concluding with
the comparative study of the evolution of wear associated with residual stresses in
AISI 52100 and Carbon Steel steels tested in a cam follower system. The work
emphasized the importance of a well-defined methodology for carrying out residual
stress measurements as well as the relevance of measures in processes involving the
wear of metallic components. According to the study carried out in this thesis, the
values of residual techniques measured by the X-ray diffraction are mainly steps
influenced by all scales of measurement parameters and are associated with the
material processing steps, with the greatest contribution being the last one. |
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