Temperature dependence of fracture toughness of silica/epoxy composites: Related to microstructure of nano- and micro-particles packing

Kwon, Soonchul; Adachi, Tadaharu; Araki, Wakako

doi:10.1016/j.compositesb.2007.10.008

Cited by 37 publications

(22 citation statements)

References 10 publications

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“…fracture toughness decreases with increasing loading rate [11], and increases with increasing temperature [12]. For wear tests at 70 N contact load, the pin temperatures at 0.2-1.4 m/s sliding speeds were lower than glass-transition temperature (T g ).…”

Section: Wear Behaviormentioning

confidence: 96%

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Wear characteristic of epoxy resin filled with crushed-silica particles

Kanchanomai

Noraphaiphipaksa

Mutoh

2011

Composites Part B: Engineering

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Section: Wear Behaviormentioning

confidence: 96%

“…8c. Above the glass-transition temperature, the ductility and fracture toughness of epoxy-matrix were temperature dependence [12], i.e. they increased with increasing temperature or increasing sliding speed.…”

Section: Abrasive Wear and Particle Detachment With Epoxy-matrix Defomentioning

confidence: 97%

Wear characteristic of epoxy resin filled with crushed-silica particles

Kanchanomai

Noraphaiphipaksa

Mutoh

2011

Composites Part B: Engineering

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“…These relatively high modulus and stiff particles also result in an increase in both the strength and modulus of the modified epoxy polymer. Particular effort has focused on the toughening effects of glass [24][25][26][27] and silica [28][29][30]. A number of toughening mechanisms have been reported in the literature including crack pinning [31] and crack-path deflection [32,33] in the case of micron-sized glass beads.…”

Section: Introductionmentioning

confidence: 99%

Toughened carbon fibre-reinforced polymer composites with nanoparticle-modified epoxy matrices

et al. 2016

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In the current work, the microstructure and fracture performance of carbon fibre-reinforced polymer (CFRP) composites based upon matrices of an anhydride-cured epoxy resin (formulated with a reactive diluent), and containing silica nanoparticles and/or polysiloxane core-shell rubber (CSR) nanoparticles, were investigated. Double cantilever beam tests were performed in order to determine the interlaminar fracture energy of the CFRP composites, while the single-edge-notched bend specimen was employed to evaluate the fracture energy of the bulk polymers. The fracture energy of the bulk epoxy polymers increased from 173 J/m 2 for the unmodified polymer to a maximum of 1237 J/ m 2 with the addition of 16 wt% of CSR nanoparticles. The toughening mechanisms were identified as (a) localised plastic shear yielding and (b) cavitation of the CSR particles followed by plastic void growth of the matrix. The steady-state propagation value of the interlaminar fracture energy of the CFRP composites increased with increasing nanoparticle concentration, from 1246 J/m 2 for the unmodified epoxy matrix to a maximum of 1851 J/m 2 with 4 wt% of silica nanoparticles and 8 wt% of CSR nanoparticles. Crack growth in the CFRP composites was dominated by fibre-bridging toughening mechanisms. The efficiency of the transfer of toughness from the bulk polymers to the carbon fibre composites was considered. The measured fracture energy of both bulk and composite materials decreased at a test temperature of -80°C, compared with room temperature, i.e. 20°C. Nevertheless, the toughening effects of both the silica and CSR nanoparticles on the bulk epoxy polymers and the CFRP composites, compared with the unmodified epoxy polymers, were still evident even at the lower temperature. Indeed, the toughening effect of the silica nanoparticles was greater at -80°C than at room temperature.

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“…The thermal mechanical properties of nanocomposites were reported to be influenced by the shape and size of nano-filler, volume fraction, quality of dispersion, and the interaction between filler and matrix (Ragosta et al, 2005;Kwon et al, 2008;Adachi et al, 2008;Zhang et al, 2006). These parameters determine the molecular mobility of matrix and the amount of energy dissipation at crack initiation and propagation as the stress transfer from matrix can be promoted by these high specific surface area particles.…”

Section: Introductionmentioning

confidence: 99%

“…To obtain silica/epoxy nanocomposites with good properties, many approaches have been devised to improving the dispersion of silica and the interaction between silica and epoxy (Fu et al, 2008;Kwon et al, 2008;Zhang et al, 2006;Chen et al, 2008;Wang et al, 2005;Zhang et al, 2008). The solution blending process has been reported as a method providing good silica dispersion and silica-epoxy bonding (Hsiue et al, 2001;Zhang et al, 2008;Liu et al, 2003;Mascia et al, 2006;Huang et al, 2005;Araki et al, 2008).…”

Section: Introductionmentioning

confidence: 99%