Análise numérica e experimental de fadiga de virabrequins

Author(s)

Eduardo Augusto Barros de Moraes

• Document type: Master's Dissertation
• Press: Campinas, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Mecânica
• Defense date: 2017-07-31

Examining board members

Marco Lúcio Bittencourt; Pablo Siqueira Meirelles; Heraldo Silva da Costa Mattos

• Advisor: Marco Lúcio Bittencourt

Abstract

Crankshafts are subjected to high loads in internal combustion engines, leading to bending and torsion stress cycles. Fatigue failure is a major concern when designing crankshafts, requiring several hours of fatigue testing, and the project becomes expensive and time consuming. With the objective of reducing test cost and time, we use finite element models to estimate test conditions and stress distribution of crankshafts under bending. We verify the accuracy of our model by comparing the numerical results with experimental data obtained from a resonant bending test rig that we designed and manufactured. The resonant test rig is used to obtain fatigue data of crank throw samples using the staircase method. Other experimental procedures such as specimen tensile and fatigue tests provide additional information on the crankshaft material. Last, we show a phase field model for damage, fracture and fatigue to simulate crack initiation and propagation. We comment on the spatial and time discretization of 1D and 2D approximations and show numerical results (AU)

• FAPESP's process: 15/10310-2 - Numerical and experimental fatigue simulation of lightweight cranckshafts
• Grantee: Eduardo Augusto Barros de Moraes
• Support Opportunities: Scholarships in Brazil - Master