This study is aimed at calculating the discharge onset voltages and power loss of the AC discharge using the charge simulation technique in a wire-cylinder reactor with a dielectric barrier at atmospheric pressure and room temperature. The calculation of the discharge onset voltages is based on the criterion of self-sustained growth of onset streamers and Trichel pulses in positive and negative half cycles, respectively. The emission of ions (space charges) from the wire surface is assumed to take place when the magnitude of the surface charge exceeds the corresponding onset values based on pre-defined discharge onset voltages for both positive and negative half cycles. The space charges are displaced by the prevailing electric field until accumulated on the glass surface. Discharge power loss corresponds to the energy required for the displacements of emitted space charges. The calculated values of the discharge onset voltage and power loss agreed reasonably with those measured experimentally.

This study is aimed at calculating the discharge onset voltages and power loss of the AC discharge using the charge simulation technique in a wire-cylinder reactor with a dielectric barrier at atmospheric pressure and room temperature. The calculation of the discharge onset voltages is based on the criterion of self-sustained growth of onset streamers and Trichel pulses in positive and negative half cycles, respectively. The emission of ions (space charges) from the wire surface is assumed to take place when the magnitude of the surface charge exceeds the corresponding onset values based on pre-defined discharge onset voltages for both positive and negative half cycles. The space charges are displaced by the prevailing electric field until accumulated on the glass surface. Discharge power loss corresponds to the energy required for the displacements of emitted space charges. The calculated values of the discharge onset voltage and power loss agreed reasonably with those measured experimentally.

Jute fiber mats-reinforced unsaturated polyester matrix composites having different fiber weight contents (11, 22, 2 wt%) were fabricated by modifying the hand lay-up technique with resin pre-impregnation into the jute mats in a vacuum. This modification showed a better impregnation of resin throughout the jute mats and lower voids contents in the composites. Two types of impact tests, swing pendulum (Izod) and drop weight (impulse), were carried out to evaluate the effect of fiber contents on the impact properties of above-mentioned composites. The impact properties of these composites were compared with those of neat unsaturated polyester resin material. The fracture behavior of the composites that yielded from the impact tests was characterized by observation of the composites microstructure using scanning electron microscopy (SEM). The Izod impact strength increases as the fiber content increases and the improvement in the impact strength of the composites compared to that of the neat resin occurs at 32 wt%. Moreover, the fracture surface has demonstrated single matrix crack with complete fiber pull-out at a fiber content of 11 wt%, while single matrix crack with partially fiber pull-out mechanism was confirmed at fiber contents of 22 wt% and 32 wt%. The fiber contents has a positively large effect on the impulse total impact energy of the composites, e.g. the total energy increases with fiber contents of 11 and 22 wt% to about three times, whereas the total energy increases at 32 wt% to about four times compared to total energy of neat resin. Multiple matrix cracking and fiber pull-out mechanisms were revealed from the impulse impact test of the composites. Finally, this study showed that both izod and impulse impact properties can be improved by adding 32 wt% of jute fiber mats as reinforcements to unsaturated polyester matrix composites.

Recycled jute fabric cloth as inner and glass fabric cloth as outer skin layers and the jute mat as a thick core were used as hybrid fiber reinforcements for unsaturated polyester matrix composites via modifying the hand lay-up technique with resin pre-impregnation into the fabrics in vacuum. The effect of the fiber weight contents (30, 50, 58 wt%) on the tensile and bending properties were investigated and were compared with those of jute mat composites with and without outer skin jute cloth fabrics and the notch sensitivity of these composites was also investigated. These comparisons showed that adding the jute cloth and glass cloth as skin layers has improved the tensile and bending properties with respect to those of jute mat composites. While the notch sensitivity increased by adding jute cloth with respect to the jute mat composites and decreased by adding glass cloth as inner skin layers compared to the jute mat composites with jute cloth as outer skin layers.

Recycled jute fabric cloth as inner and glass fabric cloth as outer skin layers and the jute mat as a thick core were used as hybrid fiber reinforcements for unsaturated polyester matrix composites via modifying the hand lay-up technique with resin pre-impregnation into the fabrics in vacuum. The effect of the fiber weight contents (30, 50, 58 wt%) on the tensile and bending properties were investigated and were compared with those of jute mat composites with and without outer skin jute cloth fabrics and the notch sensitivity of these composites was also investigated. These comparisons showed that adding the jute cloth and glass cloth as skin layers has improved the tensile and bending properties with respect to those of jute mat composites. While the notch sensitivity increased by adding jute cloth with respect to the jute mat composites and decreased by adding glass cloth as inner skin layers compared to the jute mat composites with jute cloth as outer skin layers.

In this research, Recycled jute fabric cloth as inner and glass fabric cloth as outer skin layers and the jute mat as a thick core were used as hybrid fiber reinforcements for unsaturated polyester matrix composites via modifying the hand lay-up technique with resin pre-impregnation into the fabrics in vacuum. The effect of the fiber weight contents (30, 50, 58 wt%) on the tensile and bending properties were investigated and were compared with those of jute mat composites with and without outer skin jute cloth fabrics and the notch sensitivity of these composites was also investigated. These comparisons showed that adding the jute cloth and glass cloth as skin layers has improved the tensile and bending properties with respect to those of jute mat composites. While the notch sensitivity increased by adding jute cloth with respect to the jute mat composites and decreased by adding glass cloth as inner skin layers compared to the jute mat composites with jute cloth as outer skin layers.

In this research, Recycled jute fabric cloth as inner and glass fabric cloth as outer skin layers and the jute mat as a thick core were used as hybrid fiber reinforcements for unsaturated polyester matrix composites via modifying the hand lay-up technique with resin pre-impregnation into the fabrics in vacuum. The effect of the fiber weight contents (30, 50, 58 wt%) on the tensile and bending properties were investigated and were compared with those of jute mat composites with and without outer skin jute cloth fabrics and the notch sensitivity of these composites was also investigated. These comparisons showed that adding the jute cloth and glass cloth as skin layers has improved the tensile and bending properties with respect to those of jute mat composites. While the notch sensitivity increased by adding jute cloth with respect to the jute mat composites and decreased by adding glass cloth as inner skin layers compared to the jute mat composites with jute cloth as outer skin layers.

Jute fiber mat reinforced unsaturated polyester matrix composites having different fiber weight contents (11, 22, 32 wt%) were fabricated by modifying the hand lay-up technique with resin pre-impregnation into the jute mats in the vacuum. Tension and three-point bending tests were carried out to evaluate the effect of fiber contents on these mechanical properties of above-mentioned composites. The results showed that as the fiber weight content increases, tensile strength and modulus increase and the improvement had occurred at 22 wt% of fiber weight content with respect to that of neat resin. As the fiber weight content increases, flexural strength and modulus increase and the improvement had occurred at 11 and 32 wt% fiber contents for the flexural modulus and strength respectively compared to those of neat resin. Fiber pull out mechanism is the failure mode revealed at the fracture surfaces under tensile loading as well as at tension side of composites under bending loading.