Geraldo Maurício Cândido
Instituto Tecnológico de Aeronáutica
Composite numberUltimate tensile strengthAramidMode (statistics)FabricationComposite laminatesComposite materialEpoxyMoistureCompression (physics)Materials scienceScanning electron microscopePlain weaveContext (language use)Polymer compositesFracture (geology)FiberFracture mechanicsFailure mode and effects analysisAdhesiveDelaminationFibre-reinforced plasticShear (sheet metal)Fracture toughness
35Publications
10H-index
269Citations
Publications 34
Newest
The composite prepreg waste is still an environmental challenge. In the last decade, several researchers have been studying the recycling and reuse processes of composite components, mainly to use in secondary (non-structural) components. In this paper, uncured aerospace grade prepreg scraps resulted from the production waste were used to manufacture laminates. The carbon reinforcement of the prepreg presented plain weave style fabric. To manufacture the laminates the hand-lay up process was use...
8 CitationsSource
#1Geraldo Maurício Cândido (Aeronáutica)H-Index: 10
#2Mirabel Cerqueira Rezende (Aeronáutica)H-Index: 34
Last. Sérgio Frascino Müller de Almeida (Aeronáutica)H-Index: 2
view all 4 authors...
Fractography involves a detailed study of the fractured surface morphology of materials. Usually the Scanning Electron Microscopy (SEM) technique is applied to investigate the cause of failure and the relationship between failure modes and the microstructure of the material under investigation. This information allows one to relate structure, processing methods and materials properties with the onset in their failure and propagation. In this study, fractographical analysis is employed to investi...
9 CitationsSource
Last. Michelle Leali Costa (UNESP: Sao Paulo State University)H-Index: 17
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Nanostructured polymer composites have opened up new perspectives for multifunctional materials. In particular, carbon nanotubes (CNTs) present potential applications in order to improve mechanical and electrical performance in composites with aerospace application. The combination of epoxy resin with multiwalled carbon nanotubes results in a new functional material with enhanced electromagnetic properties. The objective of this work was the processing of radar absorbing materials based on formu...
22 CitationsSource
Last. Mirabel Cerqueira RezendeH-Index: 34
view all 4 authors...
Thermoplastic can be classified by their molecular structure as either amorphous or semicrystalline polymer. Semicrystalline polymers crystallize to form structures with excellent chemical resistance, mechanical properties, and high service temperature, whereas the amorphous are unable to form ordered structures, showing up either in glassy or rubbery state. The glass transition it is not just determined by the chemical structure but, also, by the available free volume between the chain, allowin...
Source
#1Geraldo Maurício Cândido (Aeronáutica)H-Index: 10
#2Mirabel Cerqueira Rezende (Aeronáutica)H-Index: 34
Last. Sérgio Frascino Müller de Almeida (Aeronáutica)H-Index: 2
view all 4 authors...
Many components of modern aircrafts are now manufactured from polymer composites. Reinforced laminates with continuous carbon fibers and modified epoxy resin are employed in primary and secondary structures to reduce weight and improve the aircraft performance. However, if a circumstantial failure happens, the complex fracture process of the laminates may involve interlaminar damage mechanisms. The delamination is the interlaminar discontinuity which may propagate catastrophically with the appli...
9 CitationsSource
Aramid fiber reinforced polymer composites have been used in a wide variety of applications, such as aerospace, marine, sporting equipment and in the defense sector, due to their outstanding properties at low density. The most widely adopted procedure to investigate the repair of composites has been by repairing damages simulated in composite specimens. This work presents the structural repair influence on tensile and fatigue properties of a typical aramid fiber/epoxy composite used in the aeros...
Source
#1Edson Cocchieri Botelho (UNESP: Sao Paulo State University)H-Index: 26
#2Rogério Lago Mazur (UNESP: Sao Paulo State University)H-Index: 6
Last. Mirabel Cerqueira RezendeH-Index: 34
view all 5 authors...
Aramid fiber reinforced polymer composites have been used in a wide variety of applications, such as aerospace, marine, sporting equipment and in the defense sector, due to their outstanding properties at low density. The most widely adopted procedure to investigate the repair of composites has been by repairing damages simulated in composite specimens. This work presents the structural repair influence on tensile and fatigue properties of a typical aramid fiber/epoxy composite used in the aeros...
5 CitationsSource
#1L.A.L FrancoH-Index: 1
#2Edson Cocchieri Botelho (UNESP: Sao Paulo State University)H-Index: 26
Last. Mirabel Cerqueira RezendeH-Index: 34
view all 4 authors...
A utilizacao de compositos polimericos na fabricacao de aeronaves vem sendo cada vez mais intensa. Em funcao disso, a possibilidade de ocorrer falhas em servico de um componente fabricado em composito polimerico torna-se cada vez maior. A analise de falhas de materiais compositos ainda e um tema pouco explorado, principalmente no Brasil, porem vem tornando-se cada vez mais importante em apoio a area de prevencao e investigacao de acidentes aeronauticos. Este trabalho teve como objetivo a caracte...
1 CitationsSource
#1Geraldo Maurício Cândido (Aeronáutica)H-Index: 10
#2Michelle Leali Costa (Aeronáutica)H-Index: 17
Last. Sérgio Frascino Müller de Almeida (ITA: Instituto Tecnológico de Aeronáutica)H-Index: 19
view all 4 authors...
Abstract Polymer matrix composites, when exposed to temperature and humid environment, undergo dimensional and stress state changes due to moisture induced swelling and thermal expansion. Moisture absorption may induce mechanical and physic-chemical changes that toughen the polymeric matrix and/or deteriorate matrix–fiber interface by interface debonding or micro-cracking. In the present paper, the effect of edge finishing combined with hygrothermal conditioning on the tensile strength of quasi-...
25 CitationsSource
#2Michelle Leali Costa (Aeronáutica)H-Index: 17
Last. Sérgio Frascino Müller de Almeida (ITA: Instituto Tecnológico de Aeronáutica)H-Index: 19
view all 4 authors...
Moisture and high temperature may cause a variety of effects on the mechanical and thermophysical properties of polymeric composites. The diffusion of moisture in the laminate occurs primarily by capillarity until a state of equilibrium is reached. Moisture affects the matrix and the fiber/matrix interface. The stacking sequence and the free edge finishing may affect the laminate tensile strength causing a free edge delamination; they can also affect the moisture absorption process. Laminates pr...
2 CitationsSource