The Experts below are selected from a list of 98670 Experts worldwide ranked by ideXlab platform
Xigao Jian - One of the best experts on this subject based on the ideXlab platform.
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preparation and characterization of polypiperazine amide ppesk hollow Fiber Composite nanofiltration membrane
Journal of Membrane Science, 2007Co-Authors: Fajie Yang, Daling Yang, Shouhai Zhang, Xigao JianAbstract:A modified interfacial polymerization procedure suitable for preparing hollow Fiber Composite membrane was developed. By this modified procedure, a new hollow Fiber Composite nanofiltration membrane with high permeability was prepared by interfacial polymerization of piperazine (PIP) aqueous solution and trimesoyl chloride (TMC) hexane solution. The selective layer was synthesized on the inner surface of poly(phthalazinone ether sulfone ketone) (PPESK) hollow Fiber ultrafiltration membrane. The effects of preparation conditions (such as concentration of the monomers, residence time of monomer solutions, etc.) on the performance of the hollow Fiber Composite membranes were studied. When tested at 0.35 MPa, room temperature, the hollow Fiber Composite membrane had a Na2SO4 rejection of 99.0% and a flux of about 45 L/m2 h. The rejections for MgSO4, NaCl, MgCl2, glucose, sucrose and raffinose were 72.1%, 26.8%, 9.6%, 53.9%, 99.1% and 99.8%, respectively. The Composite membrane showed good stability in the long-term running. The morphologies of the hollow Fiber membranes were studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM).
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preparation and characterization of polypiperazine amide ppesk hollow Fiber Composite nanofiltration membrane
Journal of Membrane Science, 2007Co-Authors: Fajie Yang, Daling Yang, Shouhai Zhang, Xigao JianAbstract:A modified interfacial polymerization procedure suitable for preparing hollow Fiber Composite membrane was developed. By this modified procedure, a new hollow Fiber Composite nanofiltration membrane with high permeability was prepared by interfacial polymerization of piperazine (PIP) aqueous solution and trimesoyl chloride (TMC) hexane solution. The selective layer was synthesized on the inner surface of poly(phthalazinone ether sulfone ketone) (PPESK) hollow Fiber ultrafiltration membrane. The effects of preparation conditions (such as concentration of the monomers, residence time of monomer solutions, etc.) on the performance of the hollow Fiber Composite membranes were studied. When tested at 0.35 MPa, room temperature, the hollow Fiber Composite membrane had a Na2SO4 rejection of 99.0% and a flux of about 45 L/m2 h. The rejections for MgSO4, NaCl, MgCl2, glucose, sucrose and raffinose were 72.1%, 26.8%, 9.6%, 53.9%, 99.1% and 99.8%, respectively. The Composite membrane showed good stability in the long-term running. The morphologies of the hollow Fiber membranes were studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM).
Jian Xiong - One of the best experts on this subject based on the ideXlab platform.
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bending response of carbon Fiber Composite sandwich beams with three dimensional honeycomb cores
Composite Structures, 2014Co-Authors: Jian Xiong, Ariel Leonardo Stocchi, Jinshui Yang, Shidong PanAbstract:Abstract Bending properties and failure modes of carbon Fiber Composite egg and pyramidal honeycomb beams were studied and presented in this paper. Three point bending responses of both sandwich beams were tested. Face wrinkling, face crushing, core member crushing and debonding were considered, and theoretical relationships for predicting the failure load associated with each mode were presented under three point bending load. Failure mechanism maps were constructed to predict the failure of Composite sandwich beams with pyramidal and egg honeycomb cores subjected to bending. Face wrinkling and core debonding have been investigated under three point bending and the maximum displacement was studied using analytical and experimental methods. The finite element method was employed to determine the ratio (maximum displacement/applied load) of sandwich beam with two different honeycomb cores. Comparisons between two kinds of honeycomb beams were also conducted.
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vibration and damping characteristics of hybrid carbon Fiber Composite pyramidal truss sandwich panels with viscoelastic layers
Composite Structures, 2013Co-Authors: Jinshui Yang, Bing Wang, Jian Xiong, Guoqi ZhangAbstract:Abstract The vibration and damping performances of hybrid carbon Fiber Composite pyramidal truss sandwich panels with viscoelastic layers embedded in the face sheets were investigated in this paper. Hybrid carbon Fiber Composite pyramidal truss sandwich panels containing different thickness of viscoelastic layers were manufactured using a hot press molding method. Analytical models based on modal strain energy approach were developed using ABAQUS software to estimate the damping property of the hybrid sandwich structures. A set of modal tests were carried out to investigate the vibration and damping characteristics of such hybrid sandwich panels with or without viscoelastic layers. The damping loss factors of Composite slender beams with different Fiber orientations were tested to determine the constitutive damping properties of parent materials for such hybrid sandwich panels. The numerical simulation results showed good agreement with the experimental tests. The damping loss factors of hybrid sandwich panels increased distinctly compared with previous sandwich panels due to the viscoelastic layer embedded in the face sheets.
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shear and bending performance of carbon Fiber Composite sandwich panels with pyramidal truss cores
Acta Materialia, 2012Co-Authors: Jian Xiong, Shidong Pan, Jim Papadopoulos, Ashkan VaziriAbstract:Abstract Structural performance in direct (pure) shear and three-point bending was investigated for sandwich panels with a carbon Fiber pyramidal truss core. Analytical estimates for sandwich panel strength for each loading condition were presented for possible competing failure modes. In the experimental part of the study, pyramidal truss cores were made using the hot press molding technique and then attached to flat carbon Fiber Composite face sheets to build all-Composite sandwich panels. Panels with different configurations (e.g., core relative density and face sheet thickness) were tested to probe different failure modes and investigate the mechanical properties. In general, measured failure loads showed good agreement with the analytical predictions. Failure mechanism maps illustrate the controlling failure mechanisms in various regions of parameter space.
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fabrication and crushing behavior of low density carbon Fiber Composite pyramidal truss structures
Composite Structures, 2010Co-Authors: Jian Xiong, Bing Wang, Linzhi Wu, Ashkan VaziriAbstract:A new method for fabricating carbon Fiber Composite pyramidal truss cores was developed based on the molding hot-press technique. In this method, all the continuous Fibers of Composite are aligned in the direction of struts and thus, the truss structure can fully exploit the intrinsic strength of the Fiber reinforced Composite. The microstructure and organizations of Fibers of fabricated Composite structures were examined using scanning electron microscope. The crushing response of the truss cores was also investigated and the corresponding failure modes were studied and complemented with an analytic model of the core crushing response. Our results show that the fabricated low-density truss cores have superior compressive strength and thus, could be used in development of novel lightweight multifunctional structures.
Bing Wang - One of the best experts on this subject based on the ideXlab platform.
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vibration and damping characteristics of hybrid carbon Fiber Composite pyramidal truss sandwich panels with viscoelastic layers
Composite Structures, 2013Co-Authors: Jinshui Yang, Bing Wang, Jian Xiong, Guoqi ZhangAbstract:Abstract The vibration and damping performances of hybrid carbon Fiber Composite pyramidal truss sandwich panels with viscoelastic layers embedded in the face sheets were investigated in this paper. Hybrid carbon Fiber Composite pyramidal truss sandwich panels containing different thickness of viscoelastic layers were manufactured using a hot press molding method. Analytical models based on modal strain energy approach were developed using ABAQUS software to estimate the damping property of the hybrid sandwich structures. A set of modal tests were carried out to investigate the vibration and damping characteristics of such hybrid sandwich panels with or without viscoelastic layers. The damping loss factors of Composite slender beams with different Fiber orientations were tested to determine the constitutive damping properties of parent materials for such hybrid sandwich panels. The numerical simulation results showed good agreement with the experimental tests. The damping loss factors of hybrid sandwich panels increased distinctly compared with previous sandwich panels due to the viscoelastic layer embedded in the face sheets.
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low velocity impact characteristics and residual tensile strength of carbon Fiber Composite lattice core sandwich structures
Composites Part B-engineering, 2011Co-Authors: Bing Wang, Jicai FengAbstract:Abstract In this paper, low-velocity impact characteristics and residual tensile strength of carbon Fiber Composite lattice core sandwich structures are investigated by experimentally and numerically. Low-velocity impact tests and residual tensile strength tests are performed using an instrumented drop-weight machine (Instron 9250HV) and static test machine (Instron 5569), respectively. The FE (finite element) software, ABAQUS/Explicit is employed to simulate low-velocity impact characteristics and predict residual tensile strength of carbon Fiber Composite lattice core sandwich structures. These numerical investigations create a user-defined material subroutine (VUMAT) to enhance the damage simulation which includes Hashin and Yeh failure criteria. The impact contact force and the tensile strength are accurately estimated using the present method. From results of this paper, the degradation of residual tensile strength can be divided to three stages for different impact energies, and amplitudes of degradation are affected by stacking sequences.
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fabrication and crushing behavior of low density carbon Fiber Composite pyramidal truss structures
Composite Structures, 2010Co-Authors: Jian Xiong, Bing Wang, Linzhi Wu, Ashkan VaziriAbstract:A new method for fabricating carbon Fiber Composite pyramidal truss cores was developed based on the molding hot-press technique. In this method, all the continuous Fibers of Composite are aligned in the direction of struts and thus, the truss structure can fully exploit the intrinsic strength of the Fiber reinforced Composite. The microstructure and organizations of Fibers of fabricated Composite structures were examined using scanning electron microscope. The crushing response of the truss cores was also investigated and the corresponding failure modes were studied and complemented with an analytic model of the core crushing response. Our results show that the fabricated low-density truss cores have superior compressive strength and thus, could be used in development of novel lightweight multifunctional structures.
Fajie Yang - One of the best experts on this subject based on the ideXlab platform.
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preparation and characterization of polypiperazine amide ppesk hollow Fiber Composite nanofiltration membrane
Journal of Membrane Science, 2007Co-Authors: Fajie Yang, Daling Yang, Shouhai Zhang, Xigao JianAbstract:A modified interfacial polymerization procedure suitable for preparing hollow Fiber Composite membrane was developed. By this modified procedure, a new hollow Fiber Composite nanofiltration membrane with high permeability was prepared by interfacial polymerization of piperazine (PIP) aqueous solution and trimesoyl chloride (TMC) hexane solution. The selective layer was synthesized on the inner surface of poly(phthalazinone ether sulfone ketone) (PPESK) hollow Fiber ultrafiltration membrane. The effects of preparation conditions (such as concentration of the monomers, residence time of monomer solutions, etc.) on the performance of the hollow Fiber Composite membranes were studied. When tested at 0.35 MPa, room temperature, the hollow Fiber Composite membrane had a Na2SO4 rejection of 99.0% and a flux of about 45 L/m2 h. The rejections for MgSO4, NaCl, MgCl2, glucose, sucrose and raffinose were 72.1%, 26.8%, 9.6%, 53.9%, 99.1% and 99.8%, respectively. The Composite membrane showed good stability in the long-term running. The morphologies of the hollow Fiber membranes were studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM).
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preparation and characterization of polypiperazine amide ppesk hollow Fiber Composite nanofiltration membrane
Journal of Membrane Science, 2007Co-Authors: Fajie Yang, Daling Yang, Shouhai Zhang, Xigao JianAbstract:A modified interfacial polymerization procedure suitable for preparing hollow Fiber Composite membrane was developed. By this modified procedure, a new hollow Fiber Composite nanofiltration membrane with high permeability was prepared by interfacial polymerization of piperazine (PIP) aqueous solution and trimesoyl chloride (TMC) hexane solution. The selective layer was synthesized on the inner surface of poly(phthalazinone ether sulfone ketone) (PPESK) hollow Fiber ultrafiltration membrane. The effects of preparation conditions (such as concentration of the monomers, residence time of monomer solutions, etc.) on the performance of the hollow Fiber Composite membranes were studied. When tested at 0.35 MPa, room temperature, the hollow Fiber Composite membrane had a Na2SO4 rejection of 99.0% and a flux of about 45 L/m2 h. The rejections for MgSO4, NaCl, MgCl2, glucose, sucrose and raffinose were 72.1%, 26.8%, 9.6%, 53.9%, 99.1% and 99.8%, respectively. The Composite membrane showed good stability in the long-term running. The morphologies of the hollow Fiber membranes were studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM).
Ashkan Vaziri - One of the best experts on this subject based on the ideXlab platform.
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shear and bending performance of carbon Fiber Composite sandwich panels with pyramidal truss cores
Acta Materialia, 2012Co-Authors: Jian Xiong, Shidong Pan, Jim Papadopoulos, Ashkan VaziriAbstract:Abstract Structural performance in direct (pure) shear and three-point bending was investigated for sandwich panels with a carbon Fiber pyramidal truss core. Analytical estimates for sandwich panel strength for each loading condition were presented for possible competing failure modes. In the experimental part of the study, pyramidal truss cores were made using the hot press molding technique and then attached to flat carbon Fiber Composite face sheets to build all-Composite sandwich panels. Panels with different configurations (e.g., core relative density and face sheet thickness) were tested to probe different failure modes and investigate the mechanical properties. In general, measured failure loads showed good agreement with the analytical predictions. Failure mechanism maps illustrate the controlling failure mechanisms in various regions of parameter space.
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fabrication and crushing behavior of low density carbon Fiber Composite pyramidal truss structures
Composite Structures, 2010Co-Authors: Jian Xiong, Bing Wang, Linzhi Wu, Ashkan VaziriAbstract:A new method for fabricating carbon Fiber Composite pyramidal truss cores was developed based on the molding hot-press technique. In this method, all the continuous Fibers of Composite are aligned in the direction of struts and thus, the truss structure can fully exploit the intrinsic strength of the Fiber reinforced Composite. The microstructure and organizations of Fibers of fabricated Composite structures were examined using scanning electron microscope. The crushing response of the truss cores was also investigated and the corresponding failure modes were studied and complemented with an analytic model of the core crushing response. Our results show that the fabricated low-density truss cores have superior compressive strength and thus, could be used in development of novel lightweight multifunctional structures.