Simulação computacional da deformação superficial induzida em corpos-de-prova para ensaio de fadiga em ferro fundido austemperado

• Ano de defesa: 2011
• Autor(a) principal: Ewerton Augusto de Sousa Nogueira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Engenharia Metalúrgica e de Minas; Engenharia metalúrgica
• Link de acesso: http://hdl.handle.net/1843/BUOS-8MSHEB

The process of induced surface deformation or surface rolling is widely used in castings made of steel and ductile iron in regions of stress concentrators, thereby improving its resistance to fatigue. The introduction of surface deformation hardens the material, inducing surface compressive stresses that reduce the tensile stresses that act on the part surface when subjected to loads. This study aimed to simulate the effect of surface rolling on specimens austempered ductile iron. We used the finite element method, with the assistance of software Deform 3DTM for the simulation of roulette in notched specimens. We used a notch in the specimens for fatigue with semicircular geometry with a radius of 1.20mm and 0.70 mm depth. The roller used two rolls of 50.00 mm diameter, radius of curvature of 1.20 mm, thickness 2.2 mm and the applied force of 800N. We analyzed the deformation and residual stresses in both longitudinal and transverse specimen.