Rodrigo Teixeira Santos Freire
Universidade Federal de São João del-Rei
Ultimate tensile strengthComposite materialEpoxyFactorial experimentGlass fiberFlexural strengthMaterials scienceModulusCoirSandwich panelPortland cementCompressive strengthAluminiumPolymerCementPorosityFlexural modulus
30Publications
8H-index
207Citations
Publications 24
Newest
#1Lívia Ávila de Oliveira (UFSJ: Universidade Federal de São João del-Rei)H-Index: 3
#2Maikson Luiz Passaia Tonatto (UFSM: Universidade Federal de Santa Maria)H-Index: 4
Last. Fabrizio Scarpa (UoB: University of Bristol)H-Index: 69
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Abstract This work describes the experimental and numerical behaviour of sandwich panels made of aluminium skins and bamboo core under low-velocity impact test. A statistical design is carried out to evaluate the effect of the bamboo diameter (O20 and O30 mm) and the adhesive type (epoxy and biopolymer) on the maximum load, energy to maximum load, total deflection and total energy of the panels, which are assessed through graphical and failure analysis. A non-linear finite element (FE) analysis ...
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#1Lívia Ávila de Oliveira (UFSJ: Universidade Federal de São João del-Rei)H-Index: 3
#2Jacob Nicholas Orth (TTU: Texas Tech University)
Last. Fabrizio Scarpa (UoB: University of Bristol)H-Index: 69
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#1Rodrigo Teixeira Santos Freire (UFSJ: Universidade Federal de São João del-Rei)H-Index: 8
#2J.C. dos Santos (UFSJ: Universidade Federal de São João del-Rei)
Last. LJ da Silva (UFSJ: Universidade Federal de São João del-Rei)
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Abstract Hybrid composites present unique features that meet various design requirements more efficiently and more economically than conventional composites, offering advantages such as high strength and stiffness, increased fatigue and impact resistance, among others. Ever-increasing demands for sustainability and ecologically friendly products have considerably amplified the academic and industrial interest in natural fibers in the last decades. Natural fibers, owing to their intrinsic low den...
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#1Lenir Abreu Júnior (UFSJ: Universidade Federal de São João del-Rei)
#2Rodrigo Teixeira Santos Freire (UFSJ: Universidade Federal de São João del-Rei)H-Index: 8
Last. Túlio Hallak Panzera (UFSJ: Universidade Federal de São João del-Rei)H-Index: 21
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This work investigates epoxy composites reinforced by randomly oriented, short glass fibres and silica microparticles. A full-factorial experiment evaluates the effects of glass fibre mass fraction (15 and 20 wt%) and length (5 and 10 mm), and the mass fraction of silica microparticles (5 and 10 wt%) on the apparent density and porosity, as well as the compressive and tensile strength and modulus of the hybrid composites. Hybrid epoxy composites present significantly higher tensile strength (9%)...
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#1Gabriela Luiza Cota Coura (UFSJ: Universidade Federal de São João del-Rei)H-Index: 1
#2Rodrigo Teixeira Santos Freire (UFSJ: Universidade Federal de São João del-Rei)H-Index: 8
Last. Túlio Hallak Panzera (Citec)H-Index: 21
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Abstract This work focuses on the fabrication and characterisation of epoxy composites reinforced with natural fibre layers extracted from the inner bast (phloem) of the papaya plant (Carica papaya) under tensile and three-point bending loading. The papaya phloem is composed of fibrous laminas that wrap and reinforce the stem of the plant. A set of quasi-periodically arranged holes disrupt the continuity of these layers, through which the branches emerge. The fibres in each layer constitute an a...
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#1Marilia da Silva Bertolini (UNESP: Sao Paulo State University)H-Index: 2
#2César Augusto Galvão de Morais (UNESP: Sao Paulo State University)H-Index: 1
Last. André Luis Christoforo (UFSCar: Federal University of São Carlos)H-Index: 16
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AbstractThis work evaluated the use of Pinus sp. wastes treated with a chromium, copper and boron compound (CCB), a wood preservative, to fabricate particleboards based on castor oil–polyurethane r...
2 CitationsSource
#1Júlio C. Santos (Citec)H-Index: 9
#2Lívia Ávila de Oliveira (Citec)H-Index: 3
Last. Túlio Hallak Panzera (Citec)H-Index: 21
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Abstract This work evaluates a new eco-friendly surface treatment method for coir fibres based on sodium bicarbonate (NaHCO3). The fibres are treated with 10 wt% NaHCO3 solution for different periods of time (24, 96 and 168 h). A 2141 Full Factorial Design is established to investigate the effect of the type of matrix (epoxy and polyester) and treatment time (24, 96 and 168 h) on the mechanical properties of coir fibre composites. X-Ray diffraction (XRD) analysis reveals that the treatment does ...
27 CitationsSource
#1Bruna T. Ferreira (Citec)H-Index: 2
#2Leandro José da Silva (Citec)H-Index: 7
Last. Fabrizio ScarpaH-Index: 69
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Abstract In recent years, studies of composite materials have focused on the use of natural fibres as an alternative to synthetic ones. Their attractive mechanical properties, sustainability, low cost and low weight have leveraged research in this area, with the potential of a variety of applications in the engineering field. In this paper, a Full Factorial Design (2 1 6 1 ) experiment was performed to identify the effect of silica microparticle inclusions and the stacking sequence of glass fibr...
24 CitationsSource
#1Thaís da Costa Dias (UFSJ: Universidade Federal de São João del-Rei)H-Index: 1
Last. Fabrizio Scarpa (UoB: University of Bristol)H-Index: 69
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Abstract This work investigates the incorporation of disposed carbon microfibres (CMF) obtained from the cutting process of laminate composites into epoxy polymers at different mass fractions (0, 2.5, 5, 7.5 and 10wt%). The elastic modulus and strength under tensile, compressive, flexural loads and impact resistance are investigated via Analysis of Variance (ANOVA). The tensile (compressive) modulus progressively increases up to 36.6% (28.6%) with the inclusion of CMF. The inclusion of 5wt% CMF ...
2 CitationsSource