Low velocity impact and fracture characterization of SiO₂ nanoparticles filled basalt fiber reinforced composite tubes

Abstract

Nano-microscale fracture mechanisms, which affect fracture toughness, play an important role in improving the impact characterization of fiber reinforced polymer composites. Therefore, crack behaviors are tried to be controlled with fracture mechanisms by filling nanoparticles into polymer matrix for improving impact characteristics and fracture toughness in latest studies. In this study, it was aimed to investigate the effects of SiO2 nanoparticles addition into epoxy matrix on the low velocity impact characteristics and fracture toughness in basalt fiber reinforced filament wound composite tubes. SiO2 nanoparticle of 4% wt. filled and unfilled ± [55]6 filament wound basalt fiber reinforced/epoxy composite tubes were subjected to low velocity impact tests at 5 J, 10 J, and 15 J of energy levels. It was seen that while the addition of nanoparticles were increasing the maximum impact forces in the range of about 19%–32%, displacements and absorbed energies decreased because of the increase in the bending stiffness. Charpy impact tests were performed to three different notched arc shaped specimens for determining the impact fracture toughness. SiO2 nanoparticles increased the fracture toughness by 20%–23%. It was observed that SiO2 nanoparticles delayed the formation of failures such as debonding and delamination, and reduced the fiber breakage branching in low velocity impact tests. A liquid penetrant test was used to inspect the crack formations and progressions on the impacted surfaces of all composite tubes as practical inspection for industrial applications. It was seen that microscope and SEM analysis supported the liquid penetrant inspection, which is a non-destructive testing method.

Investigation of nano-hybridization effects on low velocity impact behaviors of basalt fiber reinforced composites

“…It was thought to be a sign from the decreases of displacements that the local bending and contact stiffness increased by filling nanoparticles for both 10 J and 20 J of energy levels. 15,30 In addition the amount of failures and failure propagations were restricted by filling nanoparticles. 26,33 The failures were investigated with failure analysis in detail.…”

“…The lower bending rigidity may be the sing of the large amounts of failures and absorbed impact energies. 6,15,21,34,[37][38][39][40][41][42][43] Microscope and SEM analysis When damage behaviors of SiO 2 /BFR/Epoxy composites were observed at 10 J energy level given in ( Figure 5(a)), a small amount of local debonding damages was detected in the microscope image of cross section where cut from impacted zone of it. It was observed that debonding damages occurred in the upper layers.…”

“…It can nearly say that the increasing energy levels (10 J to 20 J) increases the accumulated failures on composites that applied low velocity impact. 15,30 Figures 5(c) and 6(c) show the failures of MWCNTs filled BFR/Epoxy nanocomposites for 10 J and 20 J of energy levels respectively., When failure behaviors of BFR/Epoxy composites and MWCNTs/BFR/Epoxy composites were observed at 10 J energy level, the local delamination damages increased at end of impact tests compare to MWCNTsþSiO 2 /BFR/ Epoxy nano-hybrid composites and SiO 2 /BFR/Epoxy composites given Fig. 5(a) and Fig.…”

“…4 Demirci (2020) found that SiO 2 nanoparticles addition into BFR/epoxy composite tubes improved the low velocity impact behaviors. 15 In addition Su et al (2007) defined that SiO 2 nanoparticles addition increased the interfacial adhesion between fiber and matrix by providing to expand the surface energy of surfaces. 16 Similar mechanical properties just like SiO 2 have been seen for MWCNTs addition into polymer matrix and composites in literatures.…”

An experimental investigation on lateral crushing response of glass/carbon intraply hybrid filament wound composite pipes

“…A certain part of these researches has been devoted to the mechanical properties of composite pipes and especially focused on filament wound composite pipes. The most common properties investigated are burst performance [14,15], tensile and compressive characteristics [16][17][18][19], fatigue behavior [20][21][22] and impact response [23][24][25]. Gemi et al [26] analyzed the effects of various drill types on drilling performance of glass fiber-reinforced composite pipes.…”