The Experts below are selected from a list of 7776 Experts worldwide ranked by ideXlab platform
Pere Mutje - One of the best experts on this subject based on the ideXlab platform.
-
tensile strength assessment of injection molded high yield sugarcane bagasse reinforced polypropylene
Bioresources, 2016Co-Authors: Ana M Jimenez, Francesc X Espinach, L A Granda, Marc Delgadoaguilar, German Quintana, Pere Fullanaipalmer, Pere MutjeAbstract:Sugarcane bagasse was treated to obtain sawdust, in addition to mechanical, thermomechanical, and chemical-thermomechanical pulps. The obtained Fibers were used to obtain reinforced polypropylene composites prepared by injection molding. Coupling agent contents ranging from 2 to 10% w/w were added to the composite to obtain the highest tensile strength. All the composites included 30% w/w of Reinforcing Fibers. The tensile strength of the different sugarcane bagasse fiber composites were tested and discussed. The results were compared with that of other natural fiber- or glass fiber-reinforced polypropylene composites. Pulp-based composites showed higher tensile strength than sawdust-based composites. A micromechanical analysis showed the relationship of some micromechanical properties to the orientation angle, critical length, the intrinsic tensile strength, and the interfacial shear strength. The pulps showed similar intrinsic tensile strengths and were higher than that of sawdust. The properties of the sugarcane bagasse composites compared well with other natural fiber-reinforced composites.
-
study on the technical feasibility of replacing glass Fibers by old newspaper recycled Fibers as polypropylene reinforcement
Journal of Cleaner Production, 2014Co-Authors: A Serrano, Francesc X Espinach, Josep Tresserras, Neus Pellicer, Manel Alcala, Pere MutjeAbstract:The present paper explores the aptness of old newspapers as a source of Reinforcing Fibers for composite materials. Different percentages of newspaper Fibers, obtained by wet (ONPF) and by dry processes (CONPF), were compounded with polypropylene (PP). A coupling agent was added to the compound to improve the interface between matrix and Reinforcing Fibers. Tensile test were performed to obtain the mechanical properties of the composite materials. Composite materials reinforced with sized glass fiber (GF) were also prepared and tested. The mechanical properties of the materials were compared. A fiber tensile strength factor (FTSF) and a fiber tensile modulus factor (FTMF) were proposed to evaluate the contribution of the reinforcement Fibers to the tensile properties of the composite materials. Finally a pump body, made with GF/PP composites was modeled and tested to obtain the nodal stresses and deformations under nominal pressure. A list of ONPF, CONPF reinforced composite materials was proposed to replace the GF/PP. A body pump was mold injected with a CONPF/PP composite, was assembled in a water pump and tested under nominal working conditions.
-
Estimation of the interfacial shears strength, orientation factor and mean equivalent intrinsic tensile strength in old newspaper fiber/polypropylene composites
Composites Part B: Engineering, 2013Co-Authors: A Serrano, Francesc X Espinach, Fernando Julián, R. Del Rey, José A. Méndez, Pere MutjeAbstract:Abstract The present paper investigates the suitability of old newspapers (ONPs) as a source of Reinforcing Fibers for composite materials. Different percentages of ONP Fibers were compounded with polypropylene (PP). A coupling agent was added to the compound to improve the interface between matrix and Reinforcing Fibers. Tensile test were performed to obtain the mechanical properties of the composite materials. Micromechanics of the Fibers were obtained using Hirsch model, Bowyer–Bader methodology and Kelly–Tyson equations. Due to the presence of a percentage of calcium carbonate in the obtained Fibers (10%), the computed intrinsic characteristics were addressed as equivalent. The most important results were the mean equivalent intrinsic tensile strength of the ONP Fibers, the mean orientation angle and the mean interfacial shear strength. The contributions of the matrix, the subcritical and the supercritical Fibers to the tensile strength of the composite material were also computed.
-
natural fiber reinforced thermoplastic starch composites obtained by melt processing
Composites Science and Technology, 2012Co-Authors: Jordi Girones, Pere Mutje, J P Lopez, Antonio J F Carvalho, Antonio Aprigio Da Silva Curvelo, Fabiola VilasecaAbstract:Abstract Thermoplastic starch (TPS) from industrial non-modified corn starch was obtained and reinforced with natural strands. The influence of the reinforcement on physical–chemical properties of the composites obtained by melt processing has been analyzed. For this purpose, composites reinforced with different amounts of either sisal or hemp strands have been prepared and evaluated in terms of crystallinity, water sorption, thermal and mechanical properties. The results showed that the incorporation of sisal or hemp strands caused an increase in the glass transition temperature (Tg) of the TPS as determined by DMTA. The reinforcement also increased the stiffness of the material, as reflected in both the storage modulus and the Young’s modulus. Intrinsic mechanical properties of the Reinforcing Fibers showed a lower effect on the final mechanical properties of the materials than their homogeneity and distribution within the matrix. Additionally, the addition of a natural latex plasticizer to the composite decreased the water absorption kinetics without affecting significantly the thermal and mechanical properties of the material.
James C. Seferis - One of the best experts on this subject based on the ideXlab platform.
-
matrix and fiber influences on the cryogenic microcracking of carbon fiber epoxy composites
Composites Part A-applied Science and Manufacturing, 2002Co-Authors: John F. Timmerman, Brian S. Hayes, Matthew S Tillman, James C. SeferisAbstract:Abstract Cryogenic cycling effects on symmetric carbon fiber/epoxy laminates were examined using model prepreg systems. The properties of the composite materials studied were altered through the introduction of variations in their structure and composition. The curing agent used, matrix backbone flexibility, toughening agents, and longitudinal coefficient of thermal expansion of the Reinforcing Fibers were changed to investigate their role in cryogenic microcracking. Examination of the laminates after cycling provided insight into the mechanism and origins of thermal stress-induced microcracking. Matrix properties and fiber tensile modulus were shown to have a significant impact on the response of the composite materials to cryogenic cycling. It was found in this study that higher glass transition temperatures of the laminates and the presence of toughening agents in the matrix decreased the microcracking propensity of these laminates. Higher tensile moduli and linear coefficients of thermal expansion of the Fibers were found to increase the microcrack density in the laminates studied.
-
intrinsic characterization of continuous fibre reinforced thermoplastic composites iii a collaborative study of the structure and morphology in continuous fibre reinforced pet poly ethylene terephalate and peek poly ether ether ketone technical report
Pure and Applied Chemistry, 1993Co-Authors: James C. Seferis, D R Moore, H G ZachmannAbstract:The WAXS pattern of the continuous carbon fiber-reinforced laminates can be viewed as a superposition of the scattering patterns arising from the carbon Fibers and the polymer matrix. In order to obtain the scattering of the matrix alone, the scattering of the pure Reinforcing Fibers has been measured at different azimutal angles. A procedure has been developed to substract the scattering of the Fibers from that of the complete laminate. From the corrected diagrams, the decree of crystallinity has been determined. Crystallinefractions of 0.46 and 0.34 have been obtained for the PET and the PEEK-based laminates, respectively.
Berghmans Francis - One of the best experts on this subject based on the ideXlab platform.
-
Monitoring of Torque Induced Strain in Composite Shafts with Embedded and Surface-Mounted Optical Fiber Bragg Gratings
'MDPI AG', 2021Co-Authors: Konstantaki Maria, Violakis Georgios, Pappas, Georgios A., Geernaert Thomas, Korakas Nikos, Tiriakidis Nikos, Tiriakidi Thomai, Tiriakidis Kosmas, Thienpont Hugo, Berghmans FrancisAbstract:In this study, silica glass, optical fiber Bragg gratings (FBGs) are used for torque-induced strain monitoring in carbon fiber reinforced polymer (CFRP) hollow shafts toward the development of a methodology for structural load monitoring. Optical Fibers with gratings are embedded during shaft manufacturing, by an industrial filament winding process, along different orientations with respect to its central axis and surface mounted after production. Experimental results are supported by numerical modeling of the shaft with appropriate boundary conditions and homogenized material properties. For an applied torque up to 800 Nm, the strain sensitivity of an embedded grating positioned along the Reinforcing Fibers’ direction winded under 55° is in the order of 3.6 pm/Nm, while this value is more than 4× times higher than the other examined orientations. The study also shows that surface-mounted optical fiber Bragg gratings along the Reinforcing carbon Fibers’ direction perform equally well in monitoring strains in composite shafts under torque
-
Monitoring of Torque Induced Strain in Composite Shafts with Embedded and Surface-Mounted Optical Fiber Bragg Gratings
'MDPI AG', 2021Co-Authors: Konstantaki Maria, Violakis Georgios, Geernaert Thomas, Korakas Nikos, Tiriakidis Nikos, Tiriakidi Thomai, Tiriakidis Kosmas, Thienpont Hugo, Pappas Georgios, Berghmans FrancisAbstract:In this study, silica glass, optical fiber Bragg gratings (FBGs) are used for torque-induced strain monitoring in carbon fiber reinforced polymer (CFRP) hollow shafts toward the development of a methodology for structural load monitoring. Optical Fibers with gratings are embedded during shaft manufacturing, by an industrial filament winding process, along different orientations with respect to its central axis and surface mounted after production. Experimental results are supported by numerical modeling of the shaft with appropriate boundary conditions and homogenized material properties. For an applied torque up to 800 Nm, the strain sensitivity of an embedded grating positioned along the Reinforcing Fibers’ direction winded under 55° is in the order of 3.6 pm/Nm, while this value is more than 4× times higher than the other examined orientations. The study also shows that surface-mounted optical fiber Bragg gratings along the Reinforcing carbon Fibers’ direction perform equally well in monitoring strains in composite shafts under torque. View Full-Text Keywords: carbon fiber reinforced polymer; optical fiber Bragg gratings; strain monitoring; torsion; structural health monitoring; optical fiber sensor
A Serrano - One of the best experts on this subject based on the ideXlab platform.
-
study on the technical feasibility of replacing glass Fibers by old newspaper recycled Fibers as polypropylene reinforcement
Journal of Cleaner Production, 2014Co-Authors: A Serrano, Francesc X Espinach, Josep Tresserras, Neus Pellicer, Manel Alcala, Pere MutjeAbstract:The present paper explores the aptness of old newspapers as a source of Reinforcing Fibers for composite materials. Different percentages of newspaper Fibers, obtained by wet (ONPF) and by dry processes (CONPF), were compounded with polypropylene (PP). A coupling agent was added to the compound to improve the interface between matrix and Reinforcing Fibers. Tensile test were performed to obtain the mechanical properties of the composite materials. Composite materials reinforced with sized glass fiber (GF) were also prepared and tested. The mechanical properties of the materials were compared. A fiber tensile strength factor (FTSF) and a fiber tensile modulus factor (FTMF) were proposed to evaluate the contribution of the reinforcement Fibers to the tensile properties of the composite materials. Finally a pump body, made with GF/PP composites was modeled and tested to obtain the nodal stresses and deformations under nominal pressure. A list of ONPF, CONPF reinforced composite materials was proposed to replace the GF/PP. A body pump was mold injected with a CONPF/PP composite, was assembled in a water pump and tested under nominal working conditions.
-
Estimation of the interfacial shears strength, orientation factor and mean equivalent intrinsic tensile strength in old newspaper fiber/polypropylene composites
Composites Part B: Engineering, 2013Co-Authors: A Serrano, Francesc X Espinach, Fernando Julián, R. Del Rey, José A. Méndez, Pere MutjeAbstract:Abstract The present paper investigates the suitability of old newspapers (ONPs) as a source of Reinforcing Fibers for composite materials. Different percentages of ONP Fibers were compounded with polypropylene (PP). A coupling agent was added to the compound to improve the interface between matrix and Reinforcing Fibers. Tensile test were performed to obtain the mechanical properties of the composite materials. Micromechanics of the Fibers were obtained using Hirsch model, Bowyer–Bader methodology and Kelly–Tyson equations. Due to the presence of a percentage of calcium carbonate in the obtained Fibers (10%), the computed intrinsic characteristics were addressed as equivalent. The most important results were the mean equivalent intrinsic tensile strength of the ONP Fibers, the mean orientation angle and the mean interfacial shear strength. The contributions of the matrix, the subcritical and the supercritical Fibers to the tensile strength of the composite material were also computed.
Joel Dyksterhouse - One of the best experts on this subject based on the ideXlab platform.
-
the characterization of low cost fiber reinforced thermoplastic composites produced by the drift process
Composites Part A-applied Science and Manufacturing, 2001Co-Authors: Tim Hartness, George Husman, John R Koenig, Joel DyksterhouseAbstract:Abstract A new, low cost process for hot-melt impregnation of continuous Reinforcing Fibers with thermoplastic polymers is described. This technique can be used to fabricate various product forms including discontinuous, long-fiber products for compression molded parts, continuous fiber products for pultrusion, filament winding, and woven fabric applications. Mechanical data are presented for composites with various fiber and polymer combinations. Effects of fiber orientation and length on mechanical properties are discussed, and the effect of fiber–polymer bonding on impact strength and microstructure are shown. It is shown that the low cost and high performance achieved with this approach has the potential to expand applications of thermoplastic composite materials.
