The Experts below are selected from a list of 13232688 Experts worldwide ranked by ideXlab platform
Carlos Alberto Conceicao Antonio - One of the best experts on this subject based on the ideXlab platform.
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drilling fiber reinforced plastics frps manufactured by hand lay up influence of matrix viapal vup 9731 and atlac 382 05
Journal of Materials Processing Technology, 2004Co-Authors: Paulo J Davim, Pedro Reis, Carlos Alberto Conceicao AntonioAbstract:Abstract Drilling composite materials is a very common and an important process used in industry to perform the assembly of aerospace and automotive composite structures. However, drilling composite materials present a number of problems such as delamination associated with the characteristics of the material and with the used cutting parameters. In order to reduce these problems a study is present with the objective of evaluating the cutting parameters (cutting velocity and feed) and the influence of the matrix under specific cutting force (kc), delamination factor (Fd) and surface roughness (Ra) in two types of matrix (Viapal VUP 9731 and ATLAC 382-05). A plan of experiments, based on the orthogonal array, was established considering drilling with prefixed cutting parameters in two hand Lay-Up FRPs materials. Finally the analysis of variance (ANOVA) was preformed to investigate the cutting characteristics of FRPs composite material using a cemented carbide (K10) drill with appropriate geometry.
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a study on milling of glass fiber reinforced plastics manufactured by hand lay up using statistical analysis anova
Composite Structures, 2004Co-Authors: Paulo J Davim, Pedro Reis, Carlos Alberto Conceicao AntonioAbstract:Milling is the most practical machining (corrective) operation for removing excess material to produce a well defined and high quality surface. However, milling composite materials presents a number of problems such as surface delamination associated with the characteristics of the material and the cutting parameters used. In order to minimize these problem is presented a study with the objective of evaluating the cutting parameters (cutting velocity and feed rate) related to machining force in the workpiece, delamination factor, surface roughness and international dimensional precision in two GFRP composite materials (Viapal VUP 9731 and ATLAC 382-05). A plan of experiments, based on an orthogonal array, was established considering milling with prefixed cutting parameters. Finally an analysis of variance (ANOVA) was preformed to investigate the cutting characteristics of GFRP composite materials using a cemented carbide (K10) end mill.
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experimental study of drilling glass fiber reinforced plastics gfrp manufactured by hand lay up
Composites Science and Technology, 2004Co-Authors: Paulo J Davim, Pedro Reis, Carlos Alberto Conceicao AntonioAbstract:Drilling is a frequently practiced machining process in industry due to the need for component assembly in mechanical pieces and structures. Drilling of composite materials is significantly affected by damage tendency of these materials under action of cutting forces (thrust force and torque). So the aim of this paper is the study of the cutting parameters (cutting velocity and feed rate) under specific cutting pressure, thrust force, damage and surface roughness in Glass Fiber Reinforced Plastics (GFRP's). A plan of experiments, based on the techniques of Taguchi, was established considering drilling with prefixed cutting parameters in a hand Lay-Up GFRP material. The analysis of variance (ANOVA) was performed to investigate the cutting characteristics of GFRP's using Cemented Carbide (K10) drills with appropriate geometries. The objective was to establish a correlation between cutting velocity and feed rate with the specific cutting pressure, thrust force, damage factor and surface roughness, in a GFRP material.
Christopher G Provatidis - One of the best experts on this subject based on the ideXlab platform.
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on the post curing of graphene nanoplatelets reinforced hand lay up glass fabric epoxy nanocomposites
Composites Part B-engineering, 2018Co-Authors: G V Seretis, G Kouzilos, D E Manolakos, S F Nitodas, P D Mimigianni, Christopher G ProvatidisAbstract:Abstract Literature can hardly be found on the effect of post-curing parameters on the performance of graphene reinforced nanocomposites. In this study, the effect of post-curing temperature and time on the mechanical and thermal properties of graphene nanoplatelets (GNPs) reinforced E-glass fabric/epoxy nanocomposites is investigated. Tensile, flexural and TGA tests were carried out for the mechanical and thermal characterization. An opposite relation between mechanical and thermal properties was observed. Also, the already reported decrease of the mechanical properties while increasing the post-curing time begins later (after 4 h and 6 h for tensile and flexural tests, respectively) for the GNPs nanocomposites.
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on the graphene nanoplatelets reinforcement of hand lay up glass fabric epoxy laminated composites
Composites Part B-engineering, 2017Co-Authors: G V Seretis, G Kouzilos, D E Manolakos, Christopher G ProvatidisAbstract:Abstract Bending and tensile performance of hand Lay-Up produced glass fabric/epoxy laminated composites were investigated after matrix reinforcement with pre-dried graphene nanoplatelets (GNPs) up to 30% wt content. Two different types of E-glass fabric, i.e. twill 2 × 2 and uni-directional, were used for the tested composite samples. The response of the produced nano-composites is being explained by the settling mode of the GNPs onto the surface of the fiberglass filaments, as it was observed by a scanning electron microscope. Due to the different settling modes while increasing GNPs content, different fracture modes of the filaments were detected.
D D L Chung - One of the best experts on this subject based on the ideXlab platform.
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Effect of fiber Lay-Up configuration on the electromagnetic interference shielding effectiveness of continuous carbon fiber polymer-matrix composite
Carbon, 2019Co-Authors: D D L Chung, Asma A. EddibAbstract:Continuous carbon fiber polymer-matrix multifunctional structural composites capable of electromagnetic interference (EMI) shielding are needed for electronics and radiation sources. The laminate's fiber Lay-Up configuration affects the shielding effectiveness, as shown in this work for unmodified conventional carbon fiber polymer-matrix composite laminates with high-strength PAN-based carbon fiber and a polyamide thermoplastic matrix. The radiation is normal-incidence unpolarized plane wave, as commonly used. The shielding is dominated by absorption rather than reflection – more so for crossply composites than unidirectional composites. Due to the electrical conductivity longitudinal-to-transverse ratio of 930 for a lamina, the absorption-loss/thickness longitudinal-to-transverse ratio is 30 at 1.0 GHz. This factor of 30 means that the contribution of the fibers transverse to the electric field to absorption is negligible compared to that of the fibers parallel to the electric field. The ratio of absorption-loss/thickness for the crossply composite to that for the unidirectional composite with the same number of laminae is ∼4, and the ratio of the reflection loss for the crossply composite to that for the unidirectional composite is ∼2. The values of these ratios are consistent with electromagnetic theory for unpolarized radiation. This work strengthens the science base for the design of continuous fiber composites for shielding.
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effects of composite lay up configuration and thickness on the damage self sensing behavior of carbon fiber polymer matrix composite
Journal of Materials Science, 2005Co-Authors: Shoukai Wang, D D L Chung, Jaycee H ChungAbstract:The Lay-Up configuration (unidirectional, crossply and quasi-isotropic) and thickness (8–24 laminae) affect the damage self-sensing characteristics of continuous carbon fiber epoxy-matrix composites. The damage is by drop impact directed at the top surface of the laminate. The oblique resistance (i.e., resistance at an angle between the longitudinal and through-thickness directions) is an effective damage indicator for all Lay-Up configurations and thicknesses. The surface resistance of the bottom surface is an effective damage indicator for thin (8-lamina) composites, though it is less sensitive to minor damage than the oblique resistance. The surface resistance of the top surface is less effective than that of the bottom surface for 8-lamina multidirectional composites. The through-thickness resistance is an effective damage indicator for 16- and 24-lamina quasi-isotropic composites, but is ineffective for 8-lamina composites of any Lay-Up configuration. In general, effectiveness means a monotonic and significant increase of the resistance with damage extent.
Asma A. Eddib - One of the best experts on this subject based on the ideXlab platform.
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Effect of fiber Lay-Up configuration on the electromagnetic interference shielding effectiveness of continuous carbon fiber polymer-matrix composite
Carbon, 2019Co-Authors: D D L Chung, Asma A. EddibAbstract:Continuous carbon fiber polymer-matrix multifunctional structural composites capable of electromagnetic interference (EMI) shielding are needed for electronics and radiation sources. The laminate's fiber Lay-Up configuration affects the shielding effectiveness, as shown in this work for unmodified conventional carbon fiber polymer-matrix composite laminates with high-strength PAN-based carbon fiber and a polyamide thermoplastic matrix. The radiation is normal-incidence unpolarized plane wave, as commonly used. The shielding is dominated by absorption rather than reflection – more so for crossply composites than unidirectional composites. Due to the electrical conductivity longitudinal-to-transverse ratio of 930 for a lamina, the absorption-loss/thickness longitudinal-to-transverse ratio is 30 at 1.0 GHz. This factor of 30 means that the contribution of the fibers transverse to the electric field to absorption is negligible compared to that of the fibers parallel to the electric field. The ratio of absorption-loss/thickness for the crossply composite to that for the unidirectional composite with the same number of laminae is ∼4, and the ratio of the reflection loss for the crossply composite to that for the unidirectional composite is ∼2. The values of these ratios are consistent with electromagnetic theory for unpolarized radiation. This work strengthens the science base for the design of continuous fiber composites for shielding.
Paulo J Davim - One of the best experts on this subject based on the ideXlab platform.
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drilling fiber reinforced plastics frps manufactured by hand lay up influence of matrix viapal vup 9731 and atlac 382 05
Journal of Materials Processing Technology, 2004Co-Authors: Paulo J Davim, Pedro Reis, Carlos Alberto Conceicao AntonioAbstract:Abstract Drilling composite materials is a very common and an important process used in industry to perform the assembly of aerospace and automotive composite structures. However, drilling composite materials present a number of problems such as delamination associated with the characteristics of the material and with the used cutting parameters. In order to reduce these problems a study is present with the objective of evaluating the cutting parameters (cutting velocity and feed) and the influence of the matrix under specific cutting force (kc), delamination factor (Fd) and surface roughness (Ra) in two types of matrix (Viapal VUP 9731 and ATLAC 382-05). A plan of experiments, based on the orthogonal array, was established considering drilling with prefixed cutting parameters in two hand Lay-Up FRPs materials. Finally the analysis of variance (ANOVA) was preformed to investigate the cutting characteristics of FRPs composite material using a cemented carbide (K10) drill with appropriate geometry.
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a study on milling of glass fiber reinforced plastics manufactured by hand lay up using statistical analysis anova
Composite Structures, 2004Co-Authors: Paulo J Davim, Pedro Reis, Carlos Alberto Conceicao AntonioAbstract:Milling is the most practical machining (corrective) operation for removing excess material to produce a well defined and high quality surface. However, milling composite materials presents a number of problems such as surface delamination associated with the characteristics of the material and the cutting parameters used. In order to minimize these problem is presented a study with the objective of evaluating the cutting parameters (cutting velocity and feed rate) related to machining force in the workpiece, delamination factor, surface roughness and international dimensional precision in two GFRP composite materials (Viapal VUP 9731 and ATLAC 382-05). A plan of experiments, based on an orthogonal array, was established considering milling with prefixed cutting parameters. Finally an analysis of variance (ANOVA) was preformed to investigate the cutting characteristics of GFRP composite materials using a cemented carbide (K10) end mill.
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experimental study of drilling glass fiber reinforced plastics gfrp manufactured by hand lay up
Composites Science and Technology, 2004Co-Authors: Paulo J Davim, Pedro Reis, Carlos Alberto Conceicao AntonioAbstract:Drilling is a frequently practiced machining process in industry due to the need for component assembly in mechanical pieces and structures. Drilling of composite materials is significantly affected by damage tendency of these materials under action of cutting forces (thrust force and torque). So the aim of this paper is the study of the cutting parameters (cutting velocity and feed rate) under specific cutting pressure, thrust force, damage and surface roughness in Glass Fiber Reinforced Plastics (GFRP's). A plan of experiments, based on the techniques of Taguchi, was established considering drilling with prefixed cutting parameters in a hand Lay-Up GFRP material. The analysis of variance (ANOVA) was performed to investigate the cutting characteristics of GFRP's using Cemented Carbide (K10) drills with appropriate geometries. The objective was to establish a correlation between cutting velocity and feed rate with the specific cutting pressure, thrust force, damage factor and surface roughness, in a GFRP material.
