Carlos V. Opelt
The Catholic University of America
Composite numberUltimate tensile strengthComposite laminatesCopolymerComposite materialEpoxyTribologyThermosetting polymerCompression (physics)Materials sciencePlain weaveContext (language use)High strain ratePolymer nanocompositeElastic modulusFractographyNanoindentationCarbon nanotubeFiberPolymerFailure mode and effects analysisFibre-reinforced plasticNanocompositeFracture toughness
17Publications
8H-index
191Citations
Publications 16
Newest
#1Carlos V. Opelt (CUA: The Catholic University of America)H-Index: 8
#1C.V. Opelt (CUA: The Catholic University of America)
Last. L.A.F. Coelho (UDESC: Universidade do Estado de Santa Catarina)
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Abstract The main goal of this work is to enlighten the common misinterpretation of “plastic” deformation in thermoset polymers by exploring the concept of pseudo-ductility. To do so, different nanostructured epoxy resins were manufactured by using different nanoparticles and a block copolymer, in different amounts, and then submitted to tensile tests. The results showed that rigid nanoparticles are able to increase the stiffness and strength in 16% and 22% respectively for samples with 0.5% of ...
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#1Carolina RamirezH-Index: 1
#2Vitor Luiz ReisH-Index: 2
Last. Miguel Angel BaltazarH-Index: 1
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#2Carlos V. OpeltH-Index: 8
Last. Mirabel Cerqueira Rezende (UNIFESP: Federal University of São Paulo)H-Index: 34
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This study aims to reuse the waste of uncured composite prepreg scraps from the ply cutting manufacturing process in the aerospace industry, avoiding the resin loss, waste disposal and expenses with its incineration.Carbon fiber/F155-epoxy resin laminates were produced by randomly positioned scraps, with different sizes and shapes, and characterized by tensile, compression, interlaminar shear (ILSS), and flexural tests. Tensile, compression, and flexural strengths of produced laminates decreased...
3 CitationsSource
#1Marcia B. Schuster (UDESC: Universidade do Estado de Santa Catarina)H-Index: 2
#2Carlos V. OpeltH-Index: 8
Last. Luiz A. F. Coelho (UDESC: Universidade do Estado de Santa Catarina)H-Index: 17
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In this work, the relations between fracture surface roughness in mode I and the content of different carbon nanoparticles, graphene nanoplatelets (GNP) and carbon nanotubes (CNT) were systematically investigated. A block copolymer (BC) was also used to aid the dispersion process considering its role on fracture toughness. Both KIc and GIc were found to increase significantly with the addition of a BC along with carbon nanoparticles. Roughness measurements showed that the value of surface roughn...
7 CitationsSource
#1Vitor Luiz ReisH-Index: 2
#2Carlos V. OpeltH-Index: 8
Last. Maurício Vicente DonadonH-Index: 15
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Abstract Composite materials undergo intricate damage processes, which are accentuated when these materials are exposed to impact loading conditions. In this context, this work aims to study the behavior of fiber reinforced polymer composites submitted to high strain rate in compression. A composite laminate plate was obtained using a plain weave carbon fiber fabric and an epoxy resin as matrix. The Split Hopkinson Pressure Bar (SHPB) technique was used to apply compressive loads at three differ...
11 CitationsSource
#1Carlos V. OpeltH-Index: 8
Last. Mirabel Cerqueira Rezende (UNIFESP: Federal University of São Paulo)H-Index: 1
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Abstract After the advances of microscopic techniques, the literature shows an increasing number of fractographic studies of fiber reinforced polymer composites. However, the fractographic aspects of compressive failures remain slightly explored and poorly enlightened. In this context, the purpose of this work is to present some of the main mechanisms responsible for the fracture energy absorption in the case of fiber reinforced polymer composites submitted to compressive loads. To do so, this s...
12 CitationsSource
#1Simone de Souza Pinto (UNIFESP: Federal University of São Paulo)H-Index: 5
Last. Mirabel Cerqueira Rezende (UNIFESP: Federal University of São Paulo)H-Index: 1
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This work deals with the study of radar absorbing materials (RAM) based on conductive samples obtained with polyaniline (PAni) (5-20 wt%) inserted in epoxy resin matrix. SEM analyses show that the PAni presents granular morphology, with an average diameter of 5 µm, with structures evenly distributed. DRX and FT-IR analyses show that the PAni polymer was successfully obtained in its conductive form. Electrical permittivity and magnetic permeability measurements of PAni/epoxy samples were performe...
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#1Carlos V. OpeltH-Index: 8
Last. Mirabel Cerqueira Rezende (UNIFESP: Federal University of São Paulo)H-Index: 34
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Abstract The fractographic aspects of compression failures remain inadequately explored, mainly due to the damages that the compressive load promotes on the fracture surfaces, which difficult the identification of fracture aspects. In addition, despite the large quantity of studies on the literature, there is no consensus concerning the existing compressive failure modes. Aiming to contribute in this research field, this paper has the objective of proposing a novel classification for the compres...
22 CitationsSource
#1Carlos V. OpeltH-Index: 8
#2Jane Maria Faulstich de Paiva (UFSCar: Federal University of São Carlos)H-Index: 16
Last. Mirabel Cerqueira Rezende (UNIFESP: Federal University of São Paulo)H-Index: 34
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Abstract This paper is part of a series of fractographic studies on fiber-reinforced polymer composites submitted to compression, which attempts to fill the gap in the composite failure analysis. Here, the effect of the hygrothermal conditioning is assessed for composite laminates manufactured from a carbon fiber/epoxy resin prepregs, which used plain weave fiber arrangement. The laminate was trimmed into compression test specimens, according to the ASTM D3410 standard. After the test, the aspec...
17 CitationsSource
#1Vitor Luiz ReisH-Index: 2
#2Carlos V. OpeltH-Index: 8
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