J. G. Carrillo

Centro de Investigación Científica de Yucatán | CICY · Materials Unit

Additive manufacturing is catalyzing a new class of volumetrically varying lattice structures in which the dynamic mechanical response can be tailored for a specific application. Simultaneously, a diversity of materials is now available as feedstock including elastomers, which provide high viscoelasticity and increased durability. The combined bene...

Sandwich panels were fabricated with aluminium faces and two different types of cores: (i) the PAC (high- and low-density polyethylene-aluminium-cellulose) core made from recycled Tetra Pak and high-density polyethylene (HDPE) containers, and (ii) the PAL (low-density polyethylene-aluminium) core produced with only recycled Tetra Pak containers. Th...

Solar selective coatings (SACs) are materials deposited on solar receivers to improve the thermal performance in concentrating solar power (CSP) technologies, by increasing the absorption of solar radiation; however, the manufacture of commercial SACs involves polluting and toxic raw materials and complex processes, which make their production expe...

Manufacturing methods of CPC collectors, regardless the application, have not undergone significant modifications in recent years; the main manufacturing methods are hydraulic press stamping and some other machining methods, which generate errors in geometric curvature and damage to the high-reflectivity film coating, reducing the overall optical e...

Natural fiber-reinforced composite (NFRC) filaments for 3D printing were fabricated using polylactic acid (PLA) reinforced with 1–5 wt% henequen flour comprising particles with sizes between 90–250 μm. The flour was obtained from natural henequen fibers. NFRCs and pristine PLA specimens were printed with a 0° raster angle for tension tests. The res...

This research work strengthens a numerical evaluation of four different types of passive heat transfer methods (nanofluids, flow inserts, selective coating, and receiver geometry modification) in a parabolic trough solar collector array through an energetic, exergetic, environmental, and economic analysis (4E) for the generation of heat for the Mex...

Solar Absorber Coatings (SACs) are widely used materials for improving thermal efficiencies of solar receivers. Traditionally, these SACs are investigated using heat treatments to test their optical-thermal properties; however, tests under concentrated flux conditions are still required. In this work, the thermal efficiency of different SACs is exp...

The four-point bending behaviour of composite sandwich panels made of corrugated steel faces and foamed concrete (FC) cores with a density of 700 kg/m3 is reported. Plain FC (PFC) core and fibre-reinforced FC (FRFC) core, reinforced with an alkaline-treated natural fibre (henequen fibre) at a volume fraction of 1%, were used. FRFC core reinforced w...

Agro-industrial waste valorization is an attractive approach that offers new alternatives to deal with shrinkage and residue problems. One of these approaches is the synthesis of advanced carbon materials. Current research has shown that citrus waste, mainly orange peel, can be a precursor for the synthesis of high-quality carbon materials for chem...

Compound parabolic concentrator (CPC) solar collectors are widely used for solar energy systems in industry; however, CPC collectors for residential applications have not been fully investigated. In this work, the thermal performance of non-tracking, small-size and low-cost CPC collectors with an absorber with and without segmented fins was studied...

Geometrically-complex and lightweight ceramic parts manufactured via 3D printing are prospective structures that seem to provide excellent thermal, wear and dielectric performance. In the present work, binder jetted parts based on synthetic lightweight ceramic hollow microspheres were manufactured and evaluated under different testing conditions in...

Additive manufacturing has allowed for the production of complex and mass customized geometries, but often at the expense of mechanical performance, a penalty which can be in part mitigated with the fabrication of composite parts. Thermoplastic structures fabricated with material extrusion additive manufacturing stand to be improved in terms of fra...

Fiber Metal Laminates (FML) are structures that contain a sequential arrangement of metal and composite materials, which are of great interest to the aerospace sector due to the superior mechanical performance. The traditional manufacturing process for FML involves considerable investment in manufacturing resources depending on the design complexit...

The production and mechanical properties of fiber metal laminates (FMLs) based on 3D printed composites have been investigated in this study. FMLs are structures constituting an alternating arrangement of metal and composite materials that are used in the aerospace sector due to their unique mechanical performance. 3D printing technology in FMLs co...

In this work, an improved CFD model based on previous results is used to evaluate the scaling effects on thermal and hydraulic performance of a passive heatsink design for PV panel cooling purposes. PV systems efficiency degrades when operating temperature increases, a common incidence in hot climates exposed to high solar irradiance. In order to r...

One of the problems of designing a solar compound parabolic concentrator (CPC) is related to its manufacturing shape accuracy. The complexity of curving and holding the CPC profile in place is indeed a challenging issue, especially because there are no standardized molds and the process is typically handmade. It is very easy to provoke misalignment...

Mechanochemical degradation by planetary ball milling (PM) is used for postpolymerization modification of styrene homopolymers (PS). A complete factorial design was chosen to study the effect of radical scavengers, milling time, initial molecular weight, and revolution radius (R p ), on the shape of molecular weight distributions (MWDs) of PS. Size...

The mechanical characterization of plain foamed concrete (PFC) and fiber-reinforced foamed concrete (FRFC) with a density of 700 kg/m3 was performed with compression and tension tests. FRFC was reinforced with the natural fiber henequen (untreated or alkaline-treated) at volume fractions of 0.5%, 1% and 1.5%. Polypropylene fiber reinforcement was a...

Fiber-reinforced foamed concrete (FRFC) is a lightweight material that has the potential to perform well in seismic applications due to its low density and improved mechanical properties. However, studies focused on the seismic assessment of this material are limited. In this work, U-shaped wall specimens, made of FRFC reinforced with henequen fibe...

In this work, the mechanical properties of Kraft paper (KP) coated with a coating formulated with recycled polystyrene dissolved in the solvent lime limonene (rEPS/LL) are investigated. These mechanical properties are compared with those of KP coated with three different commercial coatings: oil-based alkyd coating (ALKY), oil-based phenolic coatin...

A composite elaborated from waste material was studied for its proposed use as a wood plastic composite. Multilayer food cartons and recycled high density polyethylene were used for the elaboration of laminates, in a proportion of 55% and 45% volume fraction, respectively. The samples were subjected to an aging in an accelerated weathering (AW) cha...

A scanning experimental design that uses Taguchi methodology allowed to apply an orthogonal type model L 12 to determine the optimal formulation and process variables—in two levels—to obtain extruded polyethylene (PE) composites with Tetra Pak multilayer cartons. The variables of the first type were the following: types of PE and mixtures of ethyle...

The efficiency of photovoltaic systems is decreased when its operating temperature increases, which can affect the performance in arid climatic conditions. In this work, a new passive cooling system for photovoltaic panels is presented, with the aim of reducing its operational temperature and preventing a reduction in its electrical efficiency in u...

In this work, the low velocity impact behaviour of thermoplastic fibre metal laminates (FMLs) made of aramid fibre reinforced polypropylene and aluminium alloy Al 5052-H32 is presented. The impact behaviour of these FMLs and their constituent materials was determined using a drop-weight impact tower. Force-time curves were used to obtain the absorb...

This study presents the optical improvement of a high flux solar simulator (HFSS) with controllable flux-spot capabilities developed for researching solar thermal and thermochemical processes. The HFSS is comprised of seven 2.5 kW el Xenon arc lamps coupled with ellipsoidal reflectors, a servo-controlled attenuator curtain, and three-axes linear te...

Fruit and nut shells can exhibit high hardness and toughness. In the peninsula of Yucatan, Mexico, the fruit of the Cocoyol palm tree (Acrocomia mexicana) is well known to be very difficult to break. Its hardness has been documented since the 1500 s, and is even mentioned in the popular Maya legend The Dwarf of Uxmal. However, until now, no scienti...

A new High Flux Solar Simulator (HFSS) has been designed and built for the research of medium/ high-temperature solar material testing and solar thermochemical processes in Mexico. The HFSS was designed using seven 2.5 kWel Xenon short arc lamps, each close-coupled to a 2 m focal length truncated ellipsoidal specular reflector made of polished alum...

The present work proposes the recycling of expanded polystyrene (EPS) waste, in order to contribute to reduce the excessive accumulation of this material in sanitary landfills in Mexico. The recovery process of EPS is proposed using a biosolvent (Lemon limonene-LL) to prepare a polymeric solution (EPS-LL), and its subsequent evaluation as a coating...

The interfacial polymer-metal adhesive property in layered materials such as fiber metal laminates (FMLs) is an important factor in their mechanical performance due to the stress transfer between the metal layers and the fiber-reinforced composite material. This study evaluates the effect of surface treatments applied to an aluminum alloy Al5052-H3...

Lignocellulosic–plastic composites are materials widely used in the construction industry; however, their mechanical performance and durability constitutes a serious issue due to the nature of the lignocellulosic component which makes it prone to biological degradation. This article gives account of the protective performance of a novel eco-friendl...

Compound parabolic concentrators are relevant systems used in solar thermal technology. With adequate tailoring, they can be used as an efficient and low-cost alternative in residential water heating applications. This work presents a simulation study using a ray tracing analysis. With this technique, we simulate the interaction between solar rays...

This work reports on the preparation of pinewood residues/recycled high-density polyethylene (HDPE) composites to evaluate their performance under flexion, extraction of nails and screws, and moisture absorption (MA) to assess their potential to replace medium-density fiberboards (MDFs). The effect of filler particle size (PS) was evaluated, and sc...

In this work, an experimental investigation of the mechanical properties of foamed concrete with and without fibre reinforcement is presented. To reinforce the foamed concrete, natural fibres, i.e., henequen and coir fibres were used. Target dry density of 800 kg/m3 was investigated. Plain foamed concrete without fibre reinforcement was also studie...

Compound parabolic concentrators are relevant systems used in solar thermal technology. With adequate tailoring, they can be used as an efficient and low-cost alternative in residential water applications. This work presents a simulation study using a ray tracing methodology. With this technique we simulate the interaction between solar rays and so...

In this paper, the tensile properties of fiber-metal laminates (FMLs) made of a low-ductility aluminum alloy and aramid fabric/polypropylene matrix composite are evaluated. The tensile testing results show that the FMLs exhibit a more ductile behavior than that of their constituents, indicated by the increased strain to failure. The excellent adhes...

Currently, there is limited information regarding the performance of solar heaters in a round-year period under real weather conditions and the determination of their characteristic equation following standard methods. Therefore, this study presents a methodology to determine the characteristic equation of the annual thermal performance under real...

The thermal behavior of an absorber plate in a solar collector is investigated using finite element analysis. The thermal behavior and efficiency of two absorber plate geometries are studied, using a typical solar collector with a rectangular profile as reference, and a proposed absorber plate with curved geometry. An analysis of the most important...

El presente trabajo presenta resultados preliminares sobre cómo respondió una comunidad a una convocatoria de separación y clasificación de residuos sólidos. El estudio se circunscribió a la comunidad del Centro de Investigación Científica de Yucatán y a contabilizar durante intervalos de tiempo determinados, todo el material depositado en un conte...

This study presents the thermal analysis of a solar flat plate water heater working under real operating conditions in a hot sub-humid region, in the city of Merida, Yucatan, Mexico. This water heater was evaluated under thermosyphon conditions and, with the use of a submersible pump, under forced flow conditions. In both cases the thermal performa...

Resumen Este artículo presenta un estudio comparativo del comportamiento térmico de dos tinacos residenciales, de polietileno y concreto, expuestos al sol a lo largo de un año en el estado de Yucatán. Se midieron la irradiación solar y las temperaturas correspondientes alcanzadas por cada sistema. Se identificaron los patrones diarios de elevación...

In this paper the impact behavior of a laminated Ultra High Molecular Weight Polyethylene (UHMWPE), was analyzed at medium velocity impacts. The aim of this study focused on the influence on the ballistic limit of four layered laminate with three fiber configurations: [0°/0°/0°/0°], [0°/90°/0°/90°], and [+45°/-45°/0°/90°]. These three configuration...

Resumen Las pruebas de alto impacto se caracterizan por las altas velocidades involucradas, así como la complejidad de los acontecimientos debido a la rapidez con la que estos ocurren; sin embargo, recurrir a estas pruebas se ha vuelto cada vez más popular, debido a los requerimientos de seguridad necesarios en estos días. En el presente documento...

High impact tests are characterized by a projectile traveling at high speed as well as complex events such as flying fragments due to the velocity at which the impact occurs; however, these tests have become increasingly popular due to need for more stringent protective material requirements nowadays. In this paper, the design and construction of a...

Popularity of wood-plastic composites is growing in many eco-applications (e.g., construction) because recycled thermoplastics, and low-density-natural fillers/reinforcements, which are renewable resources, less abrasive, and biodegradable, are used for producing them. Besides that, they can substitute medium density fiberboards (MDFs). This work r...

La necesidad de contar con productos y procesos más amigables con el medio ambiente ha motivado a estudiar la posibilidad de utilizar cartón reciclado como una alternativa al uso de contenedores de poliestireno espumado para plantas coníferas y latifoliadas, que en la actualidad se utilizan en viveros en todo el país. Para ello, se desarrolla un ma...

Se reporta la preparación de compuestos "madera-plástico" (WPCs) con HDPE reciclado y residuos de pino (PR) para evaluar su potencial como materiales de construcción. WPCs suponen ser inmunes al ataque biológico porque el plástico protege la madera de cualquier agente biótico; pero la intemperie puede generar grietas en su superficie, que permitan...

This work studies the aging of materials in a polycarbonate/chlorinated polyvinyl chloride (PC/CPVC) arrangement, used in a flat plate thermo-solar collector. Typically, PC is used as an absorbing surface and CPVC in entrance and exit heads of the flow, which in this case is water. In this study, two types of methacrylate adhesives were used to bon...

In this work, a 3D finite-element model of the ballistic impact of a multi-layered plain-woven aramid fabric style 720 (Kevlar ® 129 fibre, 1420 denier, 20×20 yarns per inch) impacted by a 6.7-mm spherical projectile was built at the mesoscale in Abaqus/Explicit by modelling individual crimped yarns. Material properties and yarn geometry for the mo...

In this work, a 3D finite-element model of the ballistic impact of a multi-layered plain-woven aramid fabric style 720 (Kevlar® 129 fibre, 1420 denier, 20×20 yarns per inch) impacted by a 6.7-mm spherical projectile was built at the mesoscale in Abaqus/Explicit by modelling individual crimped yarns. Material properties and yarn geometry for the mod...

RESUMEN El presente trabajo evalúa propuestas que ayuden a resolver el problema del acumulamiento de desechos de poliestireno expandido (EPS), proveniente en su mayoría, del embalaje de productos electrodomésticos. La implementación de este tipo de soluciones ayuda a disminuir el acumulamiento innecesario de EPS en los rellenos sanitarios; reutiliz...

In this paper, the tensile properties of plain-woven aramid fabric style 724 (Kevlar® 129 fibre, 1000 denier, 24×24 yarns per inch) and the tensile properties of individual aramid yarn extracted from the fabric are presented. It was found that this fabric is balanced with less than 5% difference in strength between the warp and weft directions. The...

The present work develops, builds, and integrates an equipment that facilitates the micromechanical study of natural and synthetic fibers and composites. This equipment, called Automated Universal Microtensometer, was designed with the integration of the latest technology to be able to test fibers and interfacial properties of composites. The reaso...

The present work develops, builds, and integrates an equipment that facilitates the micromechanical study of natural and synthetic fibers and composites. This equipment, called Automated Universal Microtensometer, was designed with the integration of the latest technology to be able to test fibers and interfacial properties of composites. The reaso...

The topic of Urban Solid Waste (USW) has become increasingly controversial in our times due to the high volumes being produced and not disposed properly; one effective way to reduce the generation of USW is finding new ways to recycling. This study proposes a means of recycling Tetra Brik ® (TBr) cartons and high density polyethylene recycled conta...

In the present study a new sandwich laminate is designed and mechanically characterized. The laminate is elaborated with a core of particulate composite material consisting of recycled material from milk and juice cartons (multilayer laminate of Tetra Brik ® ), and HDPE containers from Urban Solid Waste (USW). The elaborated material consists of al...

The aim of the present study is to analyze interfacial adhesion and characterize the tensile properties of a FML elaborated from thin layers of an aluminum alloy and layers of maleic anhydride modified polypropylene (MAHPP) reinforced with an aramid woven fabric. For the analysis of interfacial adhesion, a microbond test is carried out on the MAHPP...

Ballistic grade composite materials have shown several advantages in comparison with their individual constituents, such as increased ballistic limit and reduced posterior trauma. One configuration in particular that has demonstrated greater ballistic efficiency is the arrangement of independent laminates (IL). It presents an increase in energy abs...

Materiales resistentes, livianos y económicos son las prioridades de los diseñadores de materiales de ingeniería. Por ello, los sistemas con núcleo hueco tipo "honeycomb" están siendo estudiados para adaptar esta tecnología originalmente diseñada como materiales súper livianos para la aeronáutica y aeroespacial, para usos más genéricos. Este trabaj...