Samuel Kenig | Shenkar College of Engineering and Design (original) (raw)
Papers by Samuel Kenig
Journal of Adhesion Science and Technology, 2006
Abstract—With the emergence,of commercial,grafted caged,silica (Polyhedral Oligomeric Si- lesquio... more Abstract—With the emergence,of commercial,grafted caged,silica (Polyhedral Oligomeric Si- lesquioxanes, POSS) having a three-dimensional (3D) morphology with peripheral functionality, new opportunities have been created for formulating dental adhesives and composites with enhanced,me- chanical and physical properties. The objective of the present study was to investigate the properties obtained by incorporating grafted caged silica into acrylate based dental composite and adhesive sys-
Journal of Cellular Plastics, 1980
Journal of Cellular Plastics, 1982
Journal of Vinyl & Additive Technology, 2007
ABSTRACT
Journal of Cellular Plastics, 1984
ABSTRACT
Wiley Encyclopedia of Composites, 2011
Wiley Encyclopedia of Composites, 2011
We have investigated ballistic response of polyethylene/polyethylene (PE/PE) composites to impact... more We have investigated ballistic response of polyethylene/polyethylene (PE/PE) composites to impact by Uzi bullets. For comparison, limited work was carried out on PE/aramid fiber hybrids and PE fiber/Polycarbonate plate laminates. The plates exhibited an average ballistic resistance, V 50 , of approximately 90 m/s per 1 kg/m 2 area density. In term of the protection level per thickness, the ballistic resistance was 76 m/s per 1 mm. Visual and microscopic examinations identified indentation and delamination as the prevailing failure mechanisms. The delamination, energy calculated on the basis of a simple delamination model considering the fracture surface energy of the matrix, was shown to fully balance the dissipated kinetic energy of the bullet, while the contribution of the fiber fracture process was negligible. This is taken as strong circumstantial evidence for the significant role of this failure process in the ballistic resistance of these composites.
Journal of Cellular Plastics, 1980
ABSTRACT
Polymers for Advanced Technologies, 1991
... Liquid Crystalline Polymers Samuel Kenig Mark T. DeMeuse Michael Jaffe Department of Material... more ... Liquid Crystalline Polymers Samuel Kenig Mark T. DeMeuse Michael Jaffe Department of Materials Engineering, Technion-lsrael Institute of Technology, Haifa 32000, lsrael Enimont America, lnc., 2000 Cornwall Road, Monmouth Junction, NJ 08852, USA ...
Polymer Engineering and Science, 1982
Thermosetting three-phase syntactic foams consisting of glass microballoons, resin, and air voids... more Thermosetting three-phase syntactic foams consisting of glass microballoons, resin, and air voids dispersed in the resin were studied and are reported in the present work. Specimens for measurements of density and compressive properties were cut from the syntactic foam walls of hollow products prepared in rotational molding. These walls are characterized by loosepacked structures, densities from 0.12 to 0.24 g/cm3, and compressive strength from 3 to 20 kg/cm2. The free void fraction of these loose-packed structures is compared with close-packed structures as a function of resin weight fraction, and semiquantitative relationships are derived. Potential applications ofsuch hollow articles are as core materials for large products of complex geometries where light weight combined with a good balance of mechanical properties, low dielectric loss, and good thermal resistance are desired.
Polymer Engineering and Science, 1990
ABSTRACT
Polymer Composites, 1989
ABSTRACT
Polymer Composites, 1983
ABSTRACT The mechanical behavior of three-phase reinforced polyurethane (PU) foam composites was ... more ABSTRACT The mechanical behavior of three-phase reinforced polyurethane (PU) foam composites was investigated. Chopped-glass fibers, glass beads, and graphite powder were used as reinforcing materials. Emperimental results indicated that chopped-glass fibers enhance the foam mechanical properties in tension, while glass beads and graphite powder tend to improve the mechanical properties in compression. Microscopical observations revealed that the reinforcing filler location is within the cell walls acting as a matrix reinforcement. A modified Kerner equation, based on a model that assumes the superposition of a porous matrix and a rigid particulate filler, was compared with measured elastic moduli of the three-phase composite foams.
Polymer Composites, 1991
Fibers can greatly improve the mechanical properties of polymers but may also severely weaken mol... more Fibers can greatly improve the mechanical properties of polymers but may also severely weaken molded parts at their weld-line compared to their bulk strength. The tensile properties and fiber orientation of injection and compression molded fiber reinforced Noryl and polypropylene samples with and without a weld-zone were studied. Distinct differences in structure and mechanical properties of weldcontaining and weld-free samples were identified. In unfilled Noryl and unfilled polypropylene, the presence of a weld-line was found to only have a small effect on the tensile strength and modulus, while in the corresponding fiber reinforced systems, orientation of the fibrous reinforcement parallel to the weld-line caused a significant reduction of the tensile strength compared to the weld-free products. The strength ratio of welded and unwelded specimens was found to decrease with increasing fiber concentration. Quantitative determination of the glass fiber orientation distribution within the weld-line region and in the bulk was carried out by analyzing photomicrographs of polished sections at desired locations.
Polymer Composites, 2013
ABSTRACT Plastics have a weight advantage over metals but they lack their strength, stiffness, di... more ABSTRACT Plastics have a weight advantage over metals but they lack their strength, stiffness, dimensional stability, and electrical conduction. Fiber reinforced plastics have been used to bridge this properties gap, specifically engineering thermoplastics including carbon fibers (CFs). These composites are light, strong and stiff, electrostatically dissipating, and relatively easy to process by injection molding. However, the high aspect ratio and rigidity of the CFs cause orientation and anisotropy, especially when injection molded, thus reducing dimensional stability on the final product and limiting its use in precision components. In this study, polymer composite formulations of polyether imide containing CFs and carbon nanotubes (CNTs) were compounded and injection-molded following a design of experiments (DOE) methodology. The coefficient of thermal expansion (CTE) in the polymer flow direction and perpendicular to the flow direction was used to evaluate thermal expansion isotropy. The electrical resistivity, impact strength, and morphological structure were also investigated. It was found that the addition of CNT caused a significant reduction in the thermal expansion anisotropy of the parts without compromising the impact strength. Also, it was found that CNTs are significantly more efficient than CFs for reducing the electrical resistivity. The conclusions of this study can be used to fine-tune polymer composites with high dimensional thermal stability, electrostatic dissipation, and good mechanical properties, suitable for high-performance devices. POLYM. COMPOS. 34:1367–1374, 2013. © 2013 Society of Plastics Engineers
Polymer Composites, 1989
ABSTRACT
Polymer Composites, 1989
ABSTRACT
Polymer Composites, 1989
ABSTRACT
Journal of Adhesion Science and Technology, 2006
Abstract—With the emergence,of commercial,grafted caged,silica (Polyhedral Oligomeric Si- lesquio... more Abstract—With the emergence,of commercial,grafted caged,silica (Polyhedral Oligomeric Si- lesquioxanes, POSS) having a three-dimensional (3D) morphology with peripheral functionality, new opportunities have been created for formulating dental adhesives and composites with enhanced,me- chanical and physical properties. The objective of the present study was to investigate the properties obtained by incorporating grafted caged silica into acrylate based dental composite and adhesive sys-
Journal of Cellular Plastics, 1980
Journal of Cellular Plastics, 1982
Journal of Vinyl & Additive Technology, 2007
ABSTRACT
Journal of Cellular Plastics, 1984
ABSTRACT
Wiley Encyclopedia of Composites, 2011
Wiley Encyclopedia of Composites, 2011
We have investigated ballistic response of polyethylene/polyethylene (PE/PE) composites to impact... more We have investigated ballistic response of polyethylene/polyethylene (PE/PE) composites to impact by Uzi bullets. For comparison, limited work was carried out on PE/aramid fiber hybrids and PE fiber/Polycarbonate plate laminates. The plates exhibited an average ballistic resistance, V 50 , of approximately 90 m/s per 1 kg/m 2 area density. In term of the protection level per thickness, the ballistic resistance was 76 m/s per 1 mm. Visual and microscopic examinations identified indentation and delamination as the prevailing failure mechanisms. The delamination, energy calculated on the basis of a simple delamination model considering the fracture surface energy of the matrix, was shown to fully balance the dissipated kinetic energy of the bullet, while the contribution of the fiber fracture process was negligible. This is taken as strong circumstantial evidence for the significant role of this failure process in the ballistic resistance of these composites.
Journal of Cellular Plastics, 1980
ABSTRACT
Polymers for Advanced Technologies, 1991
... Liquid Crystalline Polymers Samuel Kenig Mark T. DeMeuse Michael Jaffe Department of Material... more ... Liquid Crystalline Polymers Samuel Kenig Mark T. DeMeuse Michael Jaffe Department of Materials Engineering, Technion-lsrael Institute of Technology, Haifa 32000, lsrael Enimont America, lnc., 2000 Cornwall Road, Monmouth Junction, NJ 08852, USA ...
Polymer Engineering and Science, 1982
Thermosetting three-phase syntactic foams consisting of glass microballoons, resin, and air voids... more Thermosetting three-phase syntactic foams consisting of glass microballoons, resin, and air voids dispersed in the resin were studied and are reported in the present work. Specimens for measurements of density and compressive properties were cut from the syntactic foam walls of hollow products prepared in rotational molding. These walls are characterized by loosepacked structures, densities from 0.12 to 0.24 g/cm3, and compressive strength from 3 to 20 kg/cm2. The free void fraction of these loose-packed structures is compared with close-packed structures as a function of resin weight fraction, and semiquantitative relationships are derived. Potential applications ofsuch hollow articles are as core materials for large products of complex geometries where light weight combined with a good balance of mechanical properties, low dielectric loss, and good thermal resistance are desired.
Polymer Engineering and Science, 1990
ABSTRACT
Polymer Composites, 1989
ABSTRACT
Polymer Composites, 1983
ABSTRACT The mechanical behavior of three-phase reinforced polyurethane (PU) foam composites was ... more ABSTRACT The mechanical behavior of three-phase reinforced polyurethane (PU) foam composites was investigated. Chopped-glass fibers, glass beads, and graphite powder were used as reinforcing materials. Emperimental results indicated that chopped-glass fibers enhance the foam mechanical properties in tension, while glass beads and graphite powder tend to improve the mechanical properties in compression. Microscopical observations revealed that the reinforcing filler location is within the cell walls acting as a matrix reinforcement. A modified Kerner equation, based on a model that assumes the superposition of a porous matrix and a rigid particulate filler, was compared with measured elastic moduli of the three-phase composite foams.
Polymer Composites, 1991
Fibers can greatly improve the mechanical properties of polymers but may also severely weaken mol... more Fibers can greatly improve the mechanical properties of polymers but may also severely weaken molded parts at their weld-line compared to their bulk strength. The tensile properties and fiber orientation of injection and compression molded fiber reinforced Noryl and polypropylene samples with and without a weld-zone were studied. Distinct differences in structure and mechanical properties of weldcontaining and weld-free samples were identified. In unfilled Noryl and unfilled polypropylene, the presence of a weld-line was found to only have a small effect on the tensile strength and modulus, while in the corresponding fiber reinforced systems, orientation of the fibrous reinforcement parallel to the weld-line caused a significant reduction of the tensile strength compared to the weld-free products. The strength ratio of welded and unwelded specimens was found to decrease with increasing fiber concentration. Quantitative determination of the glass fiber orientation distribution within the weld-line region and in the bulk was carried out by analyzing photomicrographs of polished sections at desired locations.
Polymer Composites, 2013
ABSTRACT Plastics have a weight advantage over metals but they lack their strength, stiffness, di... more ABSTRACT Plastics have a weight advantage over metals but they lack their strength, stiffness, dimensional stability, and electrical conduction. Fiber reinforced plastics have been used to bridge this properties gap, specifically engineering thermoplastics including carbon fibers (CFs). These composites are light, strong and stiff, electrostatically dissipating, and relatively easy to process by injection molding. However, the high aspect ratio and rigidity of the CFs cause orientation and anisotropy, especially when injection molded, thus reducing dimensional stability on the final product and limiting its use in precision components. In this study, polymer composite formulations of polyether imide containing CFs and carbon nanotubes (CNTs) were compounded and injection-molded following a design of experiments (DOE) methodology. The coefficient of thermal expansion (CTE) in the polymer flow direction and perpendicular to the flow direction was used to evaluate thermal expansion isotropy. The electrical resistivity, impact strength, and morphological structure were also investigated. It was found that the addition of CNT caused a significant reduction in the thermal expansion anisotropy of the parts without compromising the impact strength. Also, it was found that CNTs are significantly more efficient than CFs for reducing the electrical resistivity. The conclusions of this study can be used to fine-tune polymer composites with high dimensional thermal stability, electrostatic dissipation, and good mechanical properties, suitable for high-performance devices. POLYM. COMPOS. 34:1367–1374, 2013. © 2013 Society of Plastics Engineers
Polymer Composites, 1989
ABSTRACT
Polymer Composites, 1989
ABSTRACT
Polymer Composites, 1989
ABSTRACT