Carbon nanofibers for strain and impact damage sensing in glass fiber reinforced composites based on an unsaturated polyester resin

2011 ◽  
Vol 32 (5) ◽  
pp. 766-775 ◽  
Author(s):  
Marco Monti ◽  
Maurizio Natali ◽  
Roberto Petrucci ◽  
José M. Kenny ◽  
Luigi Torre
Keyword(s):  
Glass Fiber ◽  
Carbon Nanofibers ◽  
Polyester Resin ◽  
Impact Damage ◽  
Unsaturated Polyester ◽  
Unsaturated Polyester Resin ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Damage Sensing ◽  
Glass Fiber Reinforced

Research on the Influence of the Tension on Dielectric Strength of the Unidirectional Direction Glass Fiber Reinforced Composites

2013 ◽  
Vol 734-737 ◽  
pp. 2230-2235 ◽  
Author(s):  
Fang Tian ◽  
Su Li Xing ◽  
Ying She Luo
Keyword(s):  
Tensile Stress ◽  
Glass Fiber ◽  
Unsaturated Polyester ◽  
Longitudinal Direction ◽  
Dielectric Strength ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced ◽  
Unidirectional Glass

Based on the experimental measurements of materials dielectric strength, this paper is focused on the relationships between dielectric strength of the materials and tensile stress applied on them. The experimental results indicated that the dielectric strengths of the unsaturated polyester resin and the unidirectional glass fiber reinforced composites had an obvious decrease compared with the samples without of it. Furthermore, the dielectric strength decreased with the increase of tensile stress. When tensile stress reached 50% of the material tensile strength, the dielectric strength of the resin decreased 13.36%, and the unidirectional glass fiber reinforced unsaturated polyester composites decreased 19.86% with the tensile stress in the longitudinal direction and 12.06% in the transverse direction. When the experimental samples were broken down by electricity, cracks and pores which would lead to stress concentration were created between the electrodes around the breaking-down point. In a word, it is vital to make a research about the effect of stress on the insulating properties of materials.

scholarly journals Long Chopped Glass Fiber Reinforced Low-Density Unsaturated Polyester Resin under Different Initiation

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7307
Author(s):  
Xinjun Fu ◽  
Xiaojun Wang ◽  
Jinjian Zhu ◽  
Minzhuang Chen
Keyword(s):  
Glass Fiber ◽  
Polyester Resin ◽  
Unsaturated Polyester ◽  
Three Dimensional ◽  
Unsaturated Polyester Resin ◽  
Curing Temperature ◽  
Low Density ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced ◽  
Composite Samples

Long chopped glass fiber reinforced low-density unsaturated polyester resin (LCGFR-LDUPR) composite materials with light weight and excellent mechanical properties were prepared. It was proved that long chopped glass fiber, which was in length of 15.0 mm and chopped from ER4800-T718 plied yarn, was suitable for the preparation of LCGFR-LDUPR composite samples. With the coexistence of 1.50 parts per hundred of resin (phr) of methyl ethyl ketone peroxide (MEKP-II) and 0.05 phr of cobalt naphthenate, optimal preparation parameters were obtained, which were 20.00 phr of long chopped glass fiber, 2.50 phr of NH4HCO3, at a curing temperature of 58.0 °C. The lowest dosage of activated radicals produced by MEKP-II and cobalt naphthenate enabled the lower curing exothermic enthalpy and the slowest crosslinking for unsaturated polyester resin to carry out, resulting in a higher curing degree of resin. It was conducive to the formation, diffusion, and distribution of bubbles in uniform size, and also for the constitution of ideal three-dimensional framework of long glass fibers in the cured sample, which resulted in the LCGFR-LDUPR composite sample presenting the apparent density (ρ) of 0.68 ± 0.02 g/cm3, the compression strength (P) of 35.36 ± 0.38 MPa, and the highest specific compressive strength (Ps) of 52.00 ± 0.74 MPa/g·cm3. The work carried out an ideal three-dimensional framework of long chopped glass fiber in the reinforcement to low-density unsaturated polyester resin composite samples. It also presented the proper initiator/accelerator system of the lower curing exothermic enthalpy and the slowest crosslinking for unsaturated polyester resin.

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