12 documents found, page 1 of 2
Thermo-mechanical design optimization of symmetric and non-symmetric sandwich p...
Moleiro, Filipa; Madeira, Jose Firmino Aguilar; Carrera, E.; Ferreira, A. J. M.This work explores the multiobjective design optimization of symmetric and non-symmetric sandwich plates with ceramic-metal-ceramic functionally graded (FG) core, along with ceramic faces (if included), under thermo-mechanical loadings. The FG core is made of two functionally graded material (FGM) layers, each with the volume fractions of the constituent phases defined by a power-law function through-thickness,...
Design optimization of functionally graded plates under thermo-mechanical loadi...
Moleiro, Filipa; Madeira, Jose Firmino Aguilar; Carrera, Erasmo; Reddy, J. N.This work addresses the multiobjective design optimization of metal-ceramic functionally graded (FG) plates, which are composed of a main functionally graded material (FGM) layer and may include metal and/or ceramic faces, under thermo-mechanical loadings. The design variables are the thickness of the FGM layer, the index of its power-law distribution of metal-ceramic volume fractions, and if included, the thic...
Characterization and optimization of hybrid carbon-glass epoxy composites under...
Infante, Virginia; Madeira, JFA; Rui B. Ruben; Moleiro, Filipa; Teixeira De Freitas, SofiaThis work is intended to characterize the mechanical behavior of hybrid carbon-glass composite plates under combined loading of bending and torsion, and to determine the optimal ply fiber orientations to minimize the maximum out-of-plane displacement under such loading conditions. Hybrid composite plates were manufactured with 10 plies each and different stacking sequences using hand lay-up, with carbon fiber a...
Optimization of fibers orientation in a composite specimen
Monte, Sara M. C.; Infante, Virginia; Madeira, JFA; Moleiro, FilipaThis article is devoted to the study of the optimal design of fibers orientation in a composite specimen with the objective to minimize the displacement. The composite specimen considered is within the scope of aerospace and mechanical applications. The objective function associated with the composite design is computed based on a static analysis of a finite element solid model, which allows one to define (or c...
Fatal acute necrohaemorrhagic pancreatitis with massive intraperitoneal and ret...
Querido, Sara; Carvalho, Inês; Moleiro, Filipa; Póvoa, Pedro"An otherwise healthy 37-year-old man was admitted to hospital with uncontrollable vomiting and abdominal pain. Lithiasic acute pancreatitis was diagnosed on the basis of clinical symptoms along with raised serum amylase levels and compatible findings in ultrasonography and CT scan. Two Ranson criteria (lactate dehydrogenase over 350 U/L and aspartate aminotransferase over 250 U/L) were present at admission. Th...
An overview on how failure analysis contributes to flight safety in the Portugu...
Duarte, Diogo; Marado, Bruno; Nogueira, João; Serrano, Bruno; Infante, Virgínia; Moleiro, FilipaFailure analysis has been, throughout the years, a fundamental tool used in the aerospace sector, supporting assessments performed by sustainment and design engineers mainly related to failure modes and material suitability. The predicted service life of aircrafts often exceeds 40 years, and the design assured life rarely accounts for all in service loads and in service environmental menaces that aging aircraft...
An overview on how failure analysis contributes to flight safety in the Portugu...
Duarte, Diogo; Marado, Bruno; Nogueira, João; Serrano, Bruno; Infante, Virgínia; Moleiro, FilipaFailure analysis has been, throughout the years, a fundamental tool used in the aerospace sector, supporting assessments performed by sustainment and design engineers mainly related to failure modes and material suitability. The predicted service life of aircrafts often exceeds 40 years, and the design assured life rarely accounts for all in service loads and in service environmental menaces that aging aircraft...
Optimization of fibers orientation in a composite specimen
Monte, Sara M. C.; Infante, Vírginia; Moleiro, Filipa; Madeira, J. F. A.The main purpose of this study was to optimize the fibers orientation in a composite specimen with the objective to minimize the displacement. This composite specimen can be used in aerospace or mechanical structures. The objective function was performed with static analysis by altering the fibers orientation in a finite element solid model, computed using the ANSYS program. A recent method for global optimizat...
Layerwise mixed least-squares finite element models for free vibration analysis...
Mesquita, Teresa; Moleiro, Filipa; Araujo, A. L.; Soares, C. M.Mota; Soares, C. A. MotaThis work provides an assessment of a finite element model based on layerwise mixed formulation using least squares applied to plate sandwich structures with skins made of piezoelectric layers and the core with composite angle play laminate layers. The extension to free vibration analysis is developed. The model assumes a layerwise variable description of displacements, transverse stresses and in-plane strains,...
Microbiological study of showerhead waters from 10 beaches of great Lisboa and ...
Costa, Maria do Céu; Oliveira, Eva; Pires, Catarina; Moleiro, Filipa; Capitia, Vanessa; Vida, ManuelaMany bacteria pathogenic to man can interfere in water distribution systems, forming aggregates that give rise to a complex structure called biofilm. In order to monitor the microbiological content of water from beach showers from ten sites along the coast from Lisboa-Carcavelos to Foz do Arelho beaches, 24 water samples were analyzed in 2013, 12 during January and February, and other 12 during June. The sample...