COMPORTAMENTO DA DISTRIBUIÇÃO DE VIDA EM COMPONENTES ENTALHADOS DE ACORDO COM A TEORIA DA DISTÂNCIA CRÍTICA
Jéssica Nayara Dias1; Jorge Luiz de Almeida Ferreira1; Letícia Laleska Oliveira Silva2
1 Universidade de Brasília; 2 Universidade de Brasília
doi:10.20906/CPS/CILAMCE2017-0084
Resumo
Mechanical components subjected to cyclic loads suffer from the effect of fatigue. In the design of these components, the presence of geometric discontinuities such as holes, grooves, etc. is unavoidable. These notches allow the tension to be locally higher and their presence permits the component's resistance by fatigue failure to be less. This is a consequence of the stress concentration at the fault location. The increasing demand for safety in components, machines, parts or structures in general, associated with its complexity enforce the higher levels of reliability for these systems. Consequently, the greater assessment of the structural integrity of the component is required. This work presents the study of the distribution of life behavior in notched components submitted to multiaxial loads. In the context of predicting the probabilistic distribution of the fatigue life of these components, the models based on the critical distance criterion and the Smith-Watson-Topper, SWT, model of life prediction and incorporated into a critical plane model, were implemented and structured to perform both deterministic and probabilistic predictions (using the Monte Carlo simulation technique). Based on the results obtained it was verified that they are adherent to experimental results available in the literature.
Palavras-chave: Fatigue; Notched components; Critical distance criterion; Reliability; Monte Carlo