Sérgio Frascino Müller de Almeida
Instituto Tecnológico de Aeronáutica
PiezoelectricityComposite numberStiffeningUltimate tensile strengthEngineeringFinite element methodComposite laminatesComposite materialEpoxyBeam (structure)Piezoelectric sensorMoistureFlexural strengthMaterials scienceVibrationStiffnessNormal modeResidual stressPorosityStructural engineeringDelaminationVoid (astronomy)BucklingStress (mechanics)
48Publications
19H-index
1,167Citations
Publications 48
Newest
#1Martha L. Sánchez (UMNG: Military University Nueva Granada)H-Index: 4
#2Sérgio Frascino Müller de Almeida (ITA: Instituto Tecnológico de Aeronáutica)H-Index: 19
Last. Julian Carrillo (UMNG: Military University Nueva Granada)H-Index: 10
view all 3 authors...
#1Martha L. Sánchez (UMNG: Military University Nueva Granada)H-Index: 4
#2Sérgio Frascino Müller de Almeida (ITA: Instituto Tecnológico de Aeronáutica)H-Index: 19
Last. Julian Carrillo (UMNG: Military University Nueva Granada)H-Index: 10
view all 3 authors...
1 Citations
This paper proposes a numerical approach to estimate the dynamic behavior of a typical aeronautical aluminum box-beam structure liable to buckling. The methodology is based on a nonlinear finite element model and an experimental modal analysis procedure. The finite element model deals with the coupled nonlinear static and dynamic problems in two steps: 1) determining the static equilibrium considering geometrical nonlinearities, and 2) solving for a linear small-amplitude free-vibration problem ...
1 CitationsSource
#1Renato Dedding Martins (ITA: Instituto Tecnológico de Aeronáutica)H-Index: 1
#2Maurício Vicente Donadon (ITA: Instituto Tecnológico de Aeronáutica)H-Index: 15
Last. Sérgio Frascino Müller de Almeida (ITA: Instituto Tecnológico de Aeronáutica)H-Index: 19
view all 3 authors...
This work presents an experimental characterization of the curvature effects on the compression-after-impact strength of laminated composite shells. Curved panels impacted on the outer (convex) face and with normal pressure on the inner (concave) face with three different curvatures at three different impact energy levels were tested. A compression-after-impact testing setup was designed and implemented to evaluate the impact-induced damage tolerance of the composite shells. An analytical modeli...
Source
#1Martha Lissette Sánchez Cruz (UMNG: Military University Nueva Granada)H-Index: 1
#2Julian Carrillo (UMNG: Military University Nueva Granada)H-Index: 10
Last. Sérgio Frascino Müller de Almeida (ITA: Instituto Tecnológico de Aeronáutica)H-Index: 19
view all 3 authors...
Several mechanical properties can be affected by the occurrence of residual stresses due to curing, and their effects are more pronounced in laminated composites. The effect of the thermal residual stresses on the buckling and post-buckling properties of perimetrally reinforced laminated composites is experimentally characterized. Carbon/epoxy laminates were prepared using two different techniques. One group of laminates was prepared by co-curing the reinforcement at 177 °C. The second group of ...
6 CitationsSource
#1Alexandra Correia (UH: University of Helsinki)H-Index: 27
#2Mohammad-Ali Shahbazi (UH: University of Helsinki)H-Index: 30
Last. Hélder A. SantosH-Index: 149
view all 7 authors...
Over the past decade, the potential of polymeric structures has been investigated to overcome many limitations related to nanosized drug carriers by modulating their toxicity, cellular interactions, stability, and drug-release kinetics. In this study, we have developed a successful nanocomposite consisting of undecylenic acid modified thermally hydrocarbonized porous silicon nanoparticles (UnTHCPSi NPs) loaded with an anticancer drug, sorafenib, and surface-conjugated with heptakis(6-amino-6-deo...
34 CitationsSource
#1Rubens Zolar Gehlen Bohrer (ITA: Instituto Tecnológico de Aeronáutica)H-Index: 1
#2Sérgio Frascino Müller de Almeida (ITA: Instituto Tecnológico de Aeronáutica)H-Index: 19
Last. Maurício Vicente Donadon (ITA: Instituto Tecnológico de Aeronáutica)H-Index: 15
view all 3 authors...
Abstract The small mass impact, such as runway debris and dropped tools, is a major issue during the design of composite plates, as it may significantly reduce the plate strength and stiffness without any visible damage. This work presents a novel optimization procedure to maximize the critical buckling load of composite plates subjected to small mass impact considering impact response and delamination threshold load predicted by closed forms solutions. The optimization is based on lamination pa...
17 CitationsSource
#1Chang-Fang Wang (UH: University of Helsinki)H-Index: 9
#2Errnei M. MakilaH-Index: 1
Last. Hélder A. SantosH-Index: 149
view all 11 authors...
Porous silicon (PSi) nanomaterials combine a high drug loading capacity and tunable surface chemistry with various surface modifications to meet the requirements for biomedical applications. In this work, alkyne-terminated thermally hydrocarbonized porous silicon (THCPSi) nanoparticles were fabricated and postmodified using five bioactive molecules (targeting peptides and antifouling polymers) via a single-step click chemistry to modulate the bioactivity of the THCPSi nanoparticles, such as enha...
23 CitationsSource
#1Mariano A. Arbelo (EADS: Airbus)H-Index: 13
Last. Oļģerts Ozoliņš (Riga Technical University)H-Index: 1
view all 8 authors...
Nondestructive experimental methods to calculate the buckling load of imperfection sensitive thin-walled structures are one of the most important techniques for the validation of new structures and numerical models of large scale aerospace structures. Vibration correlation technique (VCT) allows determining equivalent boundary conditions and buckling load for several types of structures without reaching the instability point. VCT is already widely used for beam structures, but the technique is s...
24 CitationsSource
Durante el proceso de elaboracion de elementos compuestos son utilizados procesos tecnologicos que implican la utilizacion de temperaturas elevadas que contribuyen a generar un gradiente termico en el material una vez que los mismos son enfriados a la temperatura de operacion. Este gradiente termico provoca la aparicion de tensiones residuales que persisten en el material durante su vida util provocando efectos que pueden ser beneficiosos o perjudiciales, afectando de forma significativa las pro...
1 Citations