The Experts below are selected from a list of 54 Experts worldwide ranked by ideXlab platform
Andrzej Perec - One of the best experts on this subject based on the ideXlab platform.
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Artificial neural networks in modeling the high pressure, suspension waterjet cutting
2013Co-Authors: Andrzej PerecAbstract:This article presents the role of artificial neural networks in use of hydroabrassive suspensive jet cut process in laminate treatment. Three-Ply Layer perceptron type network with an error backpropagation learning algorithm was applied to describe this process. The article provides detailed description of neural network. This neural network simulates the treatment process and predicts its efficiency due to given parameters. The results were confronted with the laboratory results of complex studies on parameters of cutting laminate with a hydroabrasive suspension jet, whose pressure is reduced to 30 MPa.
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THE SIMULATION MODEL OF HIGHPRESSURE, SUSPENSION WATERJET CUTTING PROCESS WITH USE OF THE ARTIFICIAL NEURAL NETWORK
2007Co-Authors: Andrzej PerecAbstract:This article presents the use of artificial neural networks to simulation the process of hydroabrassive suspension jet cut whose pressure is reduced to 30 MPa. Three-Ply Layer perceptron type network with an error backpropagation learning algorithm was applied to describe this process. The article provides detailed description of neural network. This neural network simulates the limestone treatment process and predicts its efficiency due to given parameters. Impact of the most important parameters, as pressure, traverse speed, abrasive flow rate, length and diameter of nozzle was shown. Were determined in which cases this depth is biggest.
Alireza Ashori - One of the best experts on this subject based on the ideXlab platform.
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mechanical properties of carbon fiber epoxy composites effects of number of plies fiber contents and angle Ply Layers
Polymer Engineering and Science, 2014Co-Authors: Hossein Rahmani, Heydar Mahmoudi S Najafi, Shohreh Saffarzadehmatin, Alireza AshoriAbstract:Multi-axial multi-Ply fabric (MMF) composites are becoming increasingly popular as reinforcing materials in high-performance composites due to their high mechanical properties. This work aimed to study the effects of three variable parameters including fiber contents, numbers of plies, and Layer orientations on the mechanical properties of MMF composites. Unidirectional carbon fibers and a two-part epoxy resin were employed to produce the composite laminates using the manual lay-up process. It was found that the mechanical properties of composites made with 5-Ply were slightly greater than 3-Ply composites. However, there was no highly significant difference between them. Generally, the angle-Ply of the composites showed the greatest effect on the mechanical properties compared with number of plies and Layer orientations. The significant improvements in mechanical properties of the composites were further supported using scanning electron microscopy (SEM). Morphologies of the tensile fracture surfaces of composites revealed that the presence of fiber pulled out results in the creation of voids between the fibers and matrix polymer. This causes the mechanical properties of the composites to be reduced. Finally, the enhancement of mechanical properties of composites clearly confirmed that angle-Ply Layer (0°,−35°,0°,+35°,0°) had the most significant reinforcing effect among other parameters evaluated. POLYM. ENG. SCI., 54:2676–2682, 2014. © 2013 Society of Plastics Engineers
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Mechanical properties of carbon fiber/epoxy composites: Effects of number of plies, fiber contents, and angle‐Ply Layers
Polymer Engineering & Science, 2013Co-Authors: Hossein Rahmani, S. Heydar Mahmoudi Najafi, Shohreh Saffarzadeh-matin, Alireza AshoriAbstract:Multi-axial multi-Ply fabric (MMF) composites are becoming increasingly popular as reinforcing materials in high-performance composites due to their high mechanical properties. This work aimed to study the effects of three variable parameters including fiber contents, numbers of plies, and Layer orientations on the mechanical properties of MMF composites. Unidirectional carbon fibers and a two-part epoxy resin were employed to produce the composite laminates using the manual lay-up process. It was found that the mechanical properties of composites made with 5-Ply were slightly greater than 3-Ply composites. However, there was no highly significant difference between them. Generally, the angle-Ply of the composites showed the greatest effect on the mechanical properties compared with number of plies and Layer orientations. The significant improvements in mechanical properties of the composites were further supported using scanning electron microscopy (SEM). Morphologies of the tensile fracture surfaces of composites revealed that the presence of fiber pulled out results in the creation of voids between the fibers and matrix polymer. This causes the mechanical properties of the composites to be reduced. Finally, the enhancement of mechanical properties of composites clearly confirmed that angle-Ply Layer (0°,−35°,0°,+35°,0°) had the most significant reinforcing effect among other parameters evaluated. POLYM. ENG. SCI., 54:2676–2682, 2014. © 2013 Society of Plastics Engineers
Eralp Demir - One of the best experts on this subject based on the ideXlab platform.
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Additive manufacturing of compliance optimized variable stiffness composites through short fiber alignment along curvilinear paths
Additive Manufacturing, 2021Co-Authors: Torkan Shafighfard, Thomas A. Cender, Eralp DemirAbstract:Abstract Short fiber-reinforcement has been used to improve the structural performance of extrusion based 3D printed polymer materials. The converging nozzle preferentially orients the short fibers along the printing direction. By locally steering the print paths to orient the fiber directions, the benefit of the anisotropic fiber reinforcement can be optimized. In this study, a methodology is developed to design and manufacture 3D printed short fiber-reinforced composite materials with optimized fiber or print directions. The standard open-hole tension sample geometry was employed as a test case. The least squares & continuity constraints (LSC) method was used to design the locally varying fiber orientation of each Ply/Layer to optimize for minimum compliance. An algorithm was developed to convert optimum discrete fiber angles to continuous paths. Material properties were estimated based the measured the fiber orientation tensor in conjunction with the Halpin–Tsai homogenization method. Strain measurements on open-hole tensile specimens by digital image correlation (DIC) were in good agreement with finite element model predictions. Despite some defects at path drop offs, LSC optimized samples showed improved stiffness and strength over zero degree orientation samples. In addition, samples prepared with print paths following streamlines for potential flow over a cylinder yielded higher strength and stiffness.
Hossein Rahmani - One of the best experts on this subject based on the ideXlab platform.
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mechanical properties of carbon fiber epoxy composites effects of number of plies fiber contents and angle Ply Layers
Polymer Engineering and Science, 2014Co-Authors: Hossein Rahmani, Heydar Mahmoudi S Najafi, Shohreh Saffarzadehmatin, Alireza AshoriAbstract:Multi-axial multi-Ply fabric (MMF) composites are becoming increasingly popular as reinforcing materials in high-performance composites due to their high mechanical properties. This work aimed to study the effects of three variable parameters including fiber contents, numbers of plies, and Layer orientations on the mechanical properties of MMF composites. Unidirectional carbon fibers and a two-part epoxy resin were employed to produce the composite laminates using the manual lay-up process. It was found that the mechanical properties of composites made with 5-Ply were slightly greater than 3-Ply composites. However, there was no highly significant difference between them. Generally, the angle-Ply of the composites showed the greatest effect on the mechanical properties compared with number of plies and Layer orientations. The significant improvements in mechanical properties of the composites were further supported using scanning electron microscopy (SEM). Morphologies of the tensile fracture surfaces of composites revealed that the presence of fiber pulled out results in the creation of voids between the fibers and matrix polymer. This causes the mechanical properties of the composites to be reduced. Finally, the enhancement of mechanical properties of composites clearly confirmed that angle-Ply Layer (0°,−35°,0°,+35°,0°) had the most significant reinforcing effect among other parameters evaluated. POLYM. ENG. SCI., 54:2676–2682, 2014. © 2013 Society of Plastics Engineers
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Mechanical properties of carbon fiber/epoxy composites: Effects of number of plies, fiber contents, and angle‐Ply Layers
Polymer Engineering & Science, 2013Co-Authors: Hossein Rahmani, S. Heydar Mahmoudi Najafi, Shohreh Saffarzadeh-matin, Alireza AshoriAbstract:Multi-axial multi-Ply fabric (MMF) composites are becoming increasingly popular as reinforcing materials in high-performance composites due to their high mechanical properties. This work aimed to study the effects of three variable parameters including fiber contents, numbers of plies, and Layer orientations on the mechanical properties of MMF composites. Unidirectional carbon fibers and a two-part epoxy resin were employed to produce the composite laminates using the manual lay-up process. It was found that the mechanical properties of composites made with 5-Ply were slightly greater than 3-Ply composites. However, there was no highly significant difference between them. Generally, the angle-Ply of the composites showed the greatest effect on the mechanical properties compared with number of plies and Layer orientations. The significant improvements in mechanical properties of the composites were further supported using scanning electron microscopy (SEM). Morphologies of the tensile fracture surfaces of composites revealed that the presence of fiber pulled out results in the creation of voids between the fibers and matrix polymer. This causes the mechanical properties of the composites to be reduced. Finally, the enhancement of mechanical properties of composites clearly confirmed that angle-Ply Layer (0°,−35°,0°,+35°,0°) had the most significant reinforcing effect among other parameters evaluated. POLYM. ENG. SCI., 54:2676–2682, 2014. © 2013 Society of Plastics Engineers
Torkan Shafighfard - One of the best experts on this subject based on the ideXlab platform.
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Additive manufacturing of compliance optimized variable stiffness composites through short fiber alignment along curvilinear paths
Additive Manufacturing, 2021Co-Authors: Torkan Shafighfard, Thomas A. Cender, Eralp DemirAbstract:Abstract Short fiber-reinforcement has been used to improve the structural performance of extrusion based 3D printed polymer materials. The converging nozzle preferentially orients the short fibers along the printing direction. By locally steering the print paths to orient the fiber directions, the benefit of the anisotropic fiber reinforcement can be optimized. In this study, a methodology is developed to design and manufacture 3D printed short fiber-reinforced composite materials with optimized fiber or print directions. The standard open-hole tension sample geometry was employed as a test case. The least squares & continuity constraints (LSC) method was used to design the locally varying fiber orientation of each Ply/Layer to optimize for minimum compliance. An algorithm was developed to convert optimum discrete fiber angles to continuous paths. Material properties were estimated based the measured the fiber orientation tensor in conjunction with the Halpin–Tsai homogenization method. Strain measurements on open-hole tensile specimens by digital image correlation (DIC) were in good agreement with finite element model predictions. Despite some defects at path drop offs, LSC optimized samples showed improved stiffness and strength over zero degree orientation samples. In addition, samples prepared with print paths following streamlines for potential flow over a cylinder yielded higher strength and stiffness.