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Numerical study of contact forces for crack closure analysis
Antunes, F. V.; Chegini, A. G.; Correia, L.; Branco, R.Plasticity induced crack closure (PICC) has been widely studied using numerical models. Different numerical parameters can be considered to quantify the opening level, namely one based on the analysis of contact stresses at minimum load. A modified version of this parameter is proposed here, based on nodal contact forces instead of contact stresses. The predictions were found to be similar to those obtained fro...
A parameter for quantitative analysis of plasticity induced crack closure
Antunes, F. V.; Correia, L.; Ramalho, A. L.Numerical models have been successfully developed to predict plasticity induced crack closure (PICC). However, despite the large research effort a full understanding of the links between physical parameters, residual plastic wake and PICC has not been achieved yet. The plastic extension of material behind crack tip, Δyp, obtained by the integration of vertical plastic deformation perpendicularly to crack flank,...
Population mobility and the changing epidemics of HIV-2 in Portugal
Carvalho, A; Valadas, E; França, L; Carvalho, C; Aleixo, M; Mendez, J; Marques, R; Sarmento, A; Doroana, M; Antunes, F; Branco, T; Águas, M; Castro, RINTRODUCTION: Portugal is the European country with the highest frequency of HIV-2 infection, which is mainly concentrated in West Africa. The cumulative number of notified HIV-2 infections in Portugal was 1813 by the end of December 2008. To better characterize the dynamics of HIV-2 infection in the country and to obtain data that may be of use in the prevention of the spread of HIV-2, we evaluated a large poo...
Dor após cirurgia lombar: imagens e reflexos
Gaspar, AT; Morgado, S; Antunes, FAim: To characterize one population with persistent or recurrent pain after lumbar spinal surgery and evaluate the functional impact of this pathological condition. Methods: The sample consisted of patients with a history of back surgery that kept the pain level and whom had performed imaging examination of the lumbar spine after surgery. The authors made the demographic characterization of the population and t...
Qualidade de vida na sÃndrome de 'cirurgia lombar falhada'
Matias, AC; Antunes, FObjectives: Assessment of self-perceived health status and quality of life in a sample of patients with failed back surgery syndrome (FBSS) and analysis of correlations between the bodily pain dimension of the SF-36, the remaining dimensions of the same instrument and patients clinical data. Methods: Cross-sectional study with convenience sampling that included 40 patients with FBSS observed in PMR consultation...
“Quando o Lateral se Torna Central” – Caso Clínico
Roriz, N; Antunes, FPain control in rheumatological disorders is a true clinical challenge because of its multiple presentations. Unsuccessful pain control attempts, add extra difficulty to its management. Osteoarticular chronic symptoms, especially in an advanced phase, are strongly incapacitating but often undervalued despite its functional impact in patient’s life quality. Treatment options are frequently limited by its side ef...
Dor após cirurgia lombar: imagens e reflexos
Gaspar, AT; Morgado, S; Antunes, FAim: To characterize one population with persistent or recurrent pain after lumbar spinal surgery and evaluate the functional impact of this pathological condition. Methods: The sample consisted of patients with a history of back surgery that kept the pain level and whom had performed imaging examination of the lumbar spine after surgery. The authors made the demographic characterization of the population and t...
Qualidade de vida na síndrome de 'cirurgia lombar falhada'
Matias, AC; Antunes, FObjectives: Assessment of self-perceived health status and quality of life in a sample of patients with failed back surgery syndrome (FBSS) and analysis of correlations between the bodily pain dimension of the SF-36, the remaining dimensions of the same instrument and patients clinical data. Methods: Cross-sectional study with convenience sampling that included 40 patients with FBSS observed in PMR consultation...
“Quando o Lateral se Torna Central” – Caso Clínico
Roriz, N; Antunes, FPain control in rheumatological disorders is a true clinical challenge because of its multiple presentations. Unsuccessful pain control attempts, add extra difficulty to its management. Osteoarticular chronic symptoms, especially in an advanced phase, are strongly incapacitating but often undervalued despite its functional impact in patient’s life quality. Treatment options are frequently limited by its side ef...
Plasticity induced crack closure: a sensitivity analysis
Correia, L.; Antunes, F. V.; Ramalho, A. L.Plasticity induced crack closure (PICC) is closely linked to the monotonic and reversed plastic deformation occurring at the crack tip. The objective of the paper is to identify the different physical and numerical parameters affecting PICC, and develop a sensitivity analysis to quantify their relative importance. The main parameters affecting PICC are the load parameters, the yield stress, the size of finite e...
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