5 documents found, page 1 of 1
Effect of variable amplitude block loading on fatigue crack growth
Neto, D. M.; Borges, M. F.; Silva, J. M.; Antunes, F. V.The objective is to study the effect of load blocks on fatigue crack propagation. To carry out this study, the finite element program DD3IMP will be used, with the fatigue crack propagation being controlled by the value of the plastic deformation at the end of the crack. The material used was the Ti6Al4V alloy obtained by the selective laser fusion manufacturing process. Regarding the studied load patterns, two...
Effect of remaining ligament on fatigue crack growth
Jesus, Joel; Neto, D. M.; Fernandes, R. F.; Borges, M. F.; Antunes, F. V.; Sérgio, E. R.Fatigue crack growth (FCG) has been studied assuming that Keff is the crack driving force. However, the effect of crack ligament on FCG rate is not clear. Experimental-numerical work was developed in the 18Ni300 maraging steel considering different load blocks with the same initial K. No effect of crack ligament was observed experimentally, which was explained by the inexistence of crack closure effects. In t...
Fatigue crack propagation analysis in 2024-T351 aluminium alloy using nonlinear...
Borges, M. F.; Lopez-Crespo, P.; Antunes, F. V.; Moreno, B.; Prates, P.; Camas, D.; Neto, D. M.In this work, fatigue crack growth (FCG) in the 2024-T351 aluminium alloy is studied using the plastic CTOD range, Δδp. Experimental tests were performed on 12 mm thick CT specimens in order to obtain FCG rate and in cylindrical specimens to obtain stress–strain loops. A numerical analysis replicated the experimental work in terms of material, geometry and loading conditions, but assuming pure plane strain stat...
Non-small cell lung cancer's burden of disease in Portugal
Borges, M. F.; Gouveia, M.; Alarcão, J.; Sousa, R.; Barata, F.; Laranjeira, E.; Lopes, F.; Parente, B.; Pinheiro, L.; Teixeira, M. E.Aim: To estimate the Disability Adjusted Life-Years (DALY) associated with Non-Small Cell Lung Cancer (NSCLC) during 2012 in Portugal.
Sardine regime shifts off Portugal : a time series analysis of catches and wind...
Crato, Nuno; Borges, M. F.; Santos, A. M. P.; Mendes, H.; Mota, B.Decadal changes have been observed in the annual catch of sardine (Sardina pilchardus W). Long-term changes have also been observed in alongshore winds off Portugal in the last decades in winter months. During sardine spawning season (winter), northerly winds that favour upwelling led to unfavourable conditions for egg and larval survival. By using time series analysis, we investigated the effect of wind condit...