Universidad de Concepción Facultad de Ingeniería

PERSONAL

Flores Vega Paulo Andrés

Información de Contacto

  • 56 41 220 3552
  • Oficina 339 Edificio Central Facultad de Ingeniería

Sobre Flores Vega Paulo Andrés

Ingeniero Civil Mecánico - UDEC

Docteur en Sciences Appliquées. Universitè de Liège, Bélgica.

Proyectos

2016 Fondef IDeA ID15I10312

Prof. Koduri Raman (Director)*
Prof. Paulo Flores (Investigador)
Prof. Cristián Molina (Investigador)

Desarrollo de materiales nano piezoeléctricos para la generación de energía eléctrica renovable no convencional (ERNC) a partir de vibraciones mecánicas disponibles en el medioambiente
* Docente Departamento de Ingeniería en Materiales

2013 Fondef IT13 10054

Prof. Paulo Flores (Director)
Evaluación del Desempeño en Línea Productiva de Rodillos de Roll Froming Hechos deun Polímero Reforzado con Fibras y Nanotubos de Carbono

2012 Fondef CA12 10308

Prof. Carlos Medina (Investigador Principal)
Prof. Paulo Flores (Subdirector)
Diseño y desarrollo de un prototipo integrado para la síntesis masiva de nanoestructuras: aplicaciones en nanocompuestos

2010 Fondef D08I1144

Prof. Paulo Flores (Investigador)
Prof. Carlos Medina (Personal Técnico de Apoyo)
Desarrollo y manufactura de turbinas eólicas de alta eficiencia a bajas velocidades de viento
(Link Conicyt)

2010 Fondef D08I1138

Prof. Paulo Flores (Director)
Prof. Carlos Medina (Tesista)
Desarrollo de polímeros termoestables reforzados con fibras y nanopartículas para aplicaciones de alto desempeño
(Link Conicyt)

2007 Fondecyt 11070179

Prof. Paulo Flores (Investigador Responsable)
Material characterization of fiber-reinforced polymer composite materials for finite element simulations
(Link Conicyt)

Publicaciones

Correlation between mechanical and microstructural properties of vulcanized polyisoprene, polychloroprene, and nitrile-butadiene rubber subjected to accelerated thermal aging (2018), he purpose of this work was to correlate the effects of thermal aging on the macroscopic properties and microstructural changes for three vulcanized rubber types. The materials were subjected to accelerated thermal aging for periods between 0 and 168 h at 100°C. This aging was evaluated by investigating the mechanical properties and by Fourier transform infrared (FTIR) and Raman analysis. The results showed that subjecting the materials to thermal aging for a longer time decreased the elongation at break and tear strength and increased the hardness, while tensile strength exhibited different behavior and followed a different trend. The spectroscopy analyses indicated that there is a decrease in the amount of C=C present in the polymer as the aging time increased, which could be identified by the decrease in peak intensity at 1537 and 1600 cm−1 in the FTIR and Raman spectrum, respectively. These results were attributed mainly to an increase in cross-link density, which caused degradation of the material, essentially by a loss of ductility. A good linear relation (R2 approximately 0.95) between changes in the intensity of FTIR peaks for the C=C signal and changes in elongation at break and hardness was found, concluding that these are good indicators of degradation in elastomers. https://doi.org/10.1177/0095244318798171

Antibacterial Nanocomposite of Poly(Lactic Acid) and ZnO Nanoparticles Stabilized with Poly(Vinyl Alcohol): Thermal and Morphological Characterization. (2018), he effect of polyvinyl alcohol (PVA) as a surface coating agent on the antibacterial and thermal properties of polylactic acid (PLA)/ZnO nanocomposites prepared by melt blending was investigated. The ZnO nanoparticles were coated and stabilized with PVA using a solvothermal method. Nanocomposites were prepared with different ZnO nanoparticle content: 1, 3 and 5 wt.%. Electron transmission microscopy and Fourier transform infrared spectroscopy showed the presence of a layer around the nanoparticles and the interaction between nanoparticles and PVA, respectively. DSC analysis revealed that the thermal properties of the nanocomposites were not affected by the coating of ZnO nanoparticles with PVA. The PLA/ZnO nanocomposites with coated nanoparticles presented better antibacterial activity than those containing uncoated nanoparticles. https://www.tandfonline.com/doi/full/10.1080/03602559.2018.1466168

Antibacterial activity against Streptococcus mutans and diametrical tensile strength of an interim cement modified with zinc oxide nanoparticles and terpenes: An in vitro study (2018), Statement of problem Interim restorations are occasionally left in the mouth for extended periods and are susceptible to bacterial infiltration. Thus, dental interim cements with antibacterial properties are required. Purpose The purpose of this in vitro study was to determine in vitro antibacterial activity against Streptococcus mutans and to compare the diametrical tensile strength (DTSs) of dental interim cement modified with zinc oxide nanoparticles (ZnO-NPs) with that of cement modified with terpenes. Material and methods Antibacterial properties of ZnO-NPs, terpenes, and dental interim cement modified with ZnO-NPs and cement modified with terpenes against S mutans were tested according to minimum inhibitory concentration (MIC) and direct contact inhibition (DCI). Tensile strength levels were evaluated using DTS. Results were analyzed using the Kolmogorov-Smirnov, ANOVA, and Tamhane tests (α=.05). Results The MICs of ZnO-NPs and terpenes against S mutans were 61.94 μg/g and 0.25% v/v, respectively. The DCI assay under the cylinders of cement (area of contact with the agar surface) revealed significant bacterial growth inhibition on Temp-Bond NE specimens with ZnO-NPs at MIC of 495.2 μg/g (8× MIC) and with terpenes at MIC 0.999% v/v (4× MIC) (P<.05). The Temp-Bond NE cement cylinder (control group) showed the lowest DTS (1.05 ±0.27 MPa) of all other test groups. In the Zn-NPs group, the greatest increase occurred in the NP8 (8× MIC; 495.2 μg/g) group with a value of 1.50 ±0.23 MPa, a significant increase in DTS compared with the control and terpene groups (P<.05). In the terpene group, the highest increase corresponded to group T2 (2× MIC; 0.4995% v/v) with a value of 1.29 ±0.18 MPa. Conclusions The addition of terpenes and ZnO-NPs to interim cement showed antibacterial activity when in contact with S. mutans ATCC 25175. Both terpenes and ZnO-NPs antimicrobial agents increased diametral tensile strength.

The Journal of Prosthetic Dentistry 119 (5), pp. 862.e1 - 862.e7, 2018 (2018), The effect of molecular weights and hydrolysis degrees (HD) of polyvinyl alcohol (PVA) on thermal and mechanical properties and crystallinity of polylactic acid (PLA)/PVA blends was investigated. Blends were prepared by the melt blending method using PLA/PVA ratios: 80/20, 90/10 and 97/3 wt. %. A single glass transition temperatures was observed for all PLA/PVA blends, suggesting the formation of binary compatible blends at concentration range studied. Thermogravimetric analysis results showed a better thermal stability for PLA/PVA blends containing PVA of higher Mw and HD. According to mechanical properties, low quantities of PVA (3 wt. %) do not affect the tensile strength of blends (irrespective of Mw and HD). However, as the PVA content increases, tensile strength tends to lower values, especially for blends with 20 wt.% of PVA, with 98% of HD. Keywords: material testing; melt blending; polylactic acid; polyvinyl alcohol; polymer blend http://dx.doi.org/10.1590/0104-1428.03117

Assessing the energy benefit of using a wind turbine micro-siting model. (2018), Wind farm layouts are often designed based on simple rules that give rise to regular arrays. Several studies have stated that these arrays may not be efficient due to high wake losses for some wind directions. Recently, wind turbine micro-siting models have been compared with respect to regularly arrayed layouts. However, these studies have considered just a single regular layout configuration and a fixed number of turbines. In this paper, an approach is proposed to design highly efficient wind farms and is further compared to different configurations of regularly arrayed layouts considering different spacings and number of wind turbines. The proposed approach maximizes the power of a wind farm and efficiently incorporates the use of irregular terrain boundaries and real wind data. The proposed approach is first compared to the Horns Rev I layout. Subsequently, the proposed approach is further compared to different regular layout configurations using wind data measured at a site located in Northern Chile. The results suggest that regularly arrayed wind farms are sub-optimal and may be subjected to high wake losses, particularly for some wind directions. With the proposed approach, 4.09% and 2.18% higher efficiencies on average were obtained compared to aligned and staggered layouts, respectively. https://doi.org/10.1016/j.renene.2017.11.018

Wind farm layout optimization using a Gaussian-based wake model (2017), Renewable Energy 107 (2017) 531-541

Multiscale characterization of nano-engineered fiber-reinforced composites: Effect of carbon nanotubes on the out-of-plane mechanical behavior (2017), Journal of Nanomaterials, 2017 (2017), 1-9

A new synthesis route of ZnO nanonails via microwave plasma-assisted chemical vapor deposition (2016), Ceramics International, 2016

Evaluation of the fill yarns effect on the out-of-plane compressive fatigue behavior for an unidirectional glass fiber reinforced epoxy composite (2016), Composite Structures, Volume 138, 2016, pp. 237-242

Effect of ZnO nanoparticles obtained by arc discharge on thermo-mechanical properties of matrix thermoset nanocomposites (2016), Journal of Applied Polymer Science, 2016

Comparison of push-in and push-out tests for measuring interfacial shear strength in nano-reinforced composite materials (2015), Journal of Composites Materials, 2015, in press

Phase Transformations and Crack Initiation in a High-Chromium Cast Steel Under Hot Compression Tests (2015), Journal of Materials Engineering and Performance, Volume 24 (5), 2015, pp. 2025-2041

Quality and high yield synthesis of Ag nanowires by microwave-assisted hydrothermal method (2015), Nanoscale Research Letters, 2015, pp. 10-48

Influence of aramid fibers on the mechanical behavior of a hybrid carbon-aramid-reinforced epoxy composite (2015), Journal of Materials: Design and Applications, 2015

FE modeling of the cooling and tempering steps of bimetallic rolling mill rolls (2015), International Journal of Material Forming, 2015

The influence of carbon fabric weave on the in-plane shear mechanical performance of epoxy fiber-reinforced laminates (2014), Journal of Composites Materials, Volume 48 (23), 2014, pp. 2871-2878

The effect of multiwall carbon nanotubes on the in-plane shear behavior of epoxy glass fiber reinforced composites (2013), Composites: PartB, Volume 55, 2013, pp. 421-425

Capability of structural-acoustical FSI numerical model to predict natural frequencies of submerged structures with nearby rigid surfaces (2012), Computers & Fluids, 35, 117-126

Study of the geometrical inaccuracy on a SPIF two-slope pyramid by finite element simulations (2012), International Journal of Solids and Structures, Volume 49 (25), 2012, pp. 3594-3604

Accurate stress computation in plane strain tensile tests for sheet metal using experimental data (2010), Journal of Materials Processing Technology 210 (2010) pp. 1772-1779

Rotation of axes for anisotropic metal in FEM simulations (2008), International Journal of Plasticity, 2008

Model Identification and FE Simulations: Effect of Different Yield Loci and Hardening Laws in Sheet Forming (2007), International Journal of Plasticity 23, 420-449

Plane Strain Test for Metal Sheet Characterization (2007), Key Engineering Materials 344, 135-142

Development of an Experimental Equipment for the Identification of Constitutive Laws (2005), International Journal of Forming Processes, 117-137

Conferencias

Arched composite sandwich beam with variable section under large displacements. J. Rodriguez, P. Flores. ICCS16, 16th international conference on composite structures. P. 2011

Dispersion evaluation of carbon nanotubes in glass fiber/epoxy composites. C. Fernadez, G. Pincheira, C. Scheel, J. Vergara, P. Flores. ICCS16, 16th international conference on composite structures. Porto. 2011

Nonlinear analysis of a sandwih beam under localized deformations. G. Martínez, C. Medina, P. Flores. ICCS16, 16th international conference on composite structures. Porto. 2011

Material parameter identification for vacuum infusion manufactured components. F. Avalos, G. Pincheira, P. Flores. ESAFORM, 13th annual European sociaty of forming materials conference. Brescia. 2010

Influence of resin degassing on mechanical behavior of unidirectional glass/epoxy composites. J. Inostroza, F. Avalos, G. Pincheira, P. Flores. ICCS15, 15th international conference on composite structures. Porto. 2009

Thickness computation by matrial sound velocity measurements in terms of the fiber volume content on epoxy/glass fiber reinforced sheets. G. Pincheira, F. Avalos, J. Inostroza, P. Flores. ICCS15, 15th international conference on composite structures. Porto. 2009

Plane strain test for metal sheet characterization. P. Flores, F. Bonnet, A. Habraken. SheMet 2007, 12th international conference on Sheet Metal. Palermo. 2007

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