Indian Journal of Engineering & Materials Sciences Vol. 24, August 2017, pp. 283-289 Tensile and compressive properties of epoxy syntactic foams reinforced by short glass fiber Wei Yu*, Hailong Xue & Meng Qian Key Laboratory of Mechanical Reliability for Heavy Equipments and Large Structures of Hebei Province, Yanshan University, Qinhuangdao 066004, China Received 22 April 2015; accepted 29 March 2017 The hollow glass microsphere/epoxy resin syntactic foams reinforced by short glass fibers are fabricated. The microsphere is constant 5% weight ratio to the epoxy resin matrix and the fibers with weight ratio to the resin matrix are 5%, 10%, 20% and 30%. Their mechanical properties are studied by uniaxial compression test and tension test. The compressive deformation morphology and tensile fracture surfaces of syntactic foams are investigated. It is obtained that the compressive and tensile strength of syntactic foams are enhanced by adding fibers, and the 10% fiber weight ratio is found to be much more efficient, which shows 70% and 49% higher compressive strength and tensile strength respectively than that of syntactic foams without fiber content. However, the strength decreases with further addition of glass fiber beyond 10% weight ratio. The reason of strength enhancements is discussed. The compressive and tensile moduli are also enhanced by adding fibers. The ductility of composites is found to decrease with larger fiber filling. Keywords: Syntactic foams, Epoxy, Hollow glass microsphere, Glass fiber The composite of hollow particle filled polymer is called syntactic foams. Hollow particles are usually made up of glass, ceramic, materials. The epoxy resin, polyurethane, polyethylene, nylon, rubber, etc are usually used as matrix. In recent years, the syntactic foams attracted much attention by many scholars due to its low weight, low moisture absorption, high specific strength and good energy absorption 1-5 , and widely applied in the machinery industry, transportation, construction, aerospace industry and deep-sea engineering 6-8 . As two kinds of commonly used materials in the industry, the mechanical properties and modification of epoxy resin and polyurethane have been widely studied by many scholars 9-12 . Add higher volume fraction of hollow particle can greatly reduce the density of syntactic foams. However, the strength and stiffness of composites greatly decrease because of adding higher volume fraction of hollow particle 10,11,13 . Many studies reported in literature show that adding fibers in syntactic foams is one of the methods of improving the mechanical properties 14-23 . Karthikeyan et al. 15 observed that adding of chopped strand fibres into the syntactic foam system increased the flexural strength. Wouterson et al. 18 studied the effect of fiber volume fraction and length on mechanical properties and thermal properties by experiment. It is shown that the tensile strength, flexural strength and elastic modulus are enhanced by adding fiber. Ferreira et al. 20 presents the results of the addition of short fibres on the fatigue behaviour of syntactic foams. Their results show that the fatigue strength more than 30% by the addition of small percentages of glass or carbon fiber. Wang et al. 22 investigated the flexural properties of syntactic foams reinforced by fiberglass mesh and short glass fiber. On the other hand, graphene platelets and nanofibers are also used as reinforcements in these studies 7,24-28 . Numerical method is also used to investigate the effect of fiber reinforcement on properties of syntactic foams 29 . From the above research, the increase on mechanical properties of syntactic foams is not obvious for the lower contenting of glass fiber. With the increase of glass fiber filling amount, the mechanical performance of syntactic foams increase. However, how much glass fiber filled in syntactic foams is reasonable, which has yet to see literature report. Although the study of fiber reinforced epoxy resin composite is more and the influence of fiber content on the composite mechanical properties is also analyzed, the fiber reinforced epoxy resin containing hollow glass microspheres composites, especially the fiber content is higher, has a little research. The interactions of the fiber and _____________ *Corresponding author (E-mail: [email protected])
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Indian Journal of Engineering & Materials Sciences
Vol. 24, August 2017, pp. 283-289
Tensile and compressive properties of epoxy syntactic foams
reinforced by short glass fiber
Wei Yu*, Hailong Xue & Meng Qian
Key Laboratory of Mechanical Reliability for Heavy Equipments and Large Structures of Hebei Province,
Yanshan University, Qinhuangdao 066004, China
Received 22 April 2015; accepted 29 March 2017
The hollow glass microsphere/epoxy resin syntactic foams reinforced by short glass fibers are fabricated. The
microsphere is constant 5% weight ratio to the epoxy resin matrix and the fibers with weight ratio to the resin matrix are 5%,
10%, 20% and 30%. Their mechanical properties are studied by uniaxial compression test and tension test. The compressive
deformation morphology and tensile fracture surfaces of syntactic foams are investigated. It is obtained that the compressive
and tensile strength of syntactic foams are enhanced by adding fibers, and the 10% fiber weight ratio is found to be much
more efficient, which shows 70% and 49% higher compressive strength and tensile strength respectively than that of
syntactic foams without fiber content. However, the strength decreases with further addition of glass fiber beyond 10%
weight ratio. The reason of strength enhancements is discussed. The compressive and tensile moduli are also enhanced by
adding fibers. The ductility of composites is found to decrease with larger fiber filling.