The effect of agglomeration on the fracture toughness of CNTs-reinforced nanocomposites

Zeinedini, Afshin; Shokrieh, M.M.; Ebrahimi, Ali

doi:10.1016/j.tafmec.2018.01.009

Cited by 67 publications

(20 citation statements)

References 23 publications

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“…3 The crack-bridging feature of CNTs contributes to the improved fracture toughness of epoxy nanocomposites by hindering the crack growth. 16,17 However, these epoxy-CNTs nanocomposites also face the problem of agglomeration. The intrinsic incompatibility between nanoclay and epoxy leads to poor dispersion…”

Section: Introductionmentioning

confidence: 99%

Inverse Nacre-like Epoxy-Graphene Layered Nanocomposites with Integration of High Toughness and Self-Monitoring

Peng

Huang

Cao

et al. 2020

Matter

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Inverse nacre-like epoxy-graphene layered nanocomposites inspired by nacre are fabricated via freeze casting. The epoxy-graphene nanocomposites show a toughening mechanism that incorporates crack deflection, branching, and interfacial friction, exhibiting excellent fracture toughness. Furthermore, due to the conductive properties of the continuous graphene-based scaffold, crack propagation can be monitored by detecting variable electrical resistance. The inverse nacre-like epoxy-graphene nanocomposites expand the application of traditional epoxy-graphene nanocomposites in the engineering design of wind devices and in the automotive industry, aerospace, and many other areas. In addition, the nanocomposite's ability to detect cracks could inspire the design of future nanocomposites with self-monitoring capabilities, thus making them more safe and secure.

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Section: Introductionmentioning

confidence: 99%

Inverse Nacre-like Epoxy-Graphene Layered Nanocomposites with Integration of High Toughness and Self-Monitoring

Peng

Huang

Cao

et al. 2020

Matter

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“…It is worth mentioning that achieving the optimal properties of nanocomposites is strongly related to the uniform distribution of nanoparticles and the formation of proper interfaces between CNTs and matrix . Otherwise, the properties of nanocomposite decrease in comparison to those of pure resin due to the presence of nanoparticles agglomerations . Generally, the properties of nanocomposites are influenced by various factors as follows: Different methods of manufacturing or functionalizing CNTs may cause different levels of damage to nanoparticles which affect the ultimate properties of nanocomposites …”

Section: Introductionmentioning

confidence: 99%

“…5 Otherwise, the properties of nanocomposite decrease in comparison to those of pure resin due to the presence of nanoparticles agglomerations. 6,7 Generally, the properties of nanocomposites are influenced by various factors as follows:…”

Section: Introductionmentioning

confidence: 99%

Experimental fracture investigation of CNT/epoxy nanocomposite under mixed mode II/III loading conditions

Karami

Ayatollahi

Saboori

2020

Fatigue Fract Eng Mat Struct

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For the first time, the brittle fracture of epoxy‐based nanocomposite reinforced with MWCNTs (multi‐walled carbon nanotubes) and subjected to mixed mode II/III loading conditions is investigated. This experimental investigation is carried out using a newly developed test configuration. Araldite LY 5052 epoxy, which is a resin frequently used in aerospace industry, is utilized to fabricate pure epoxy and nanocomposite test specimens with two different MWCNTs contents of 0.1 and 0.5 wt%. The obtained experimental results reveal that adding MWCNTs to epoxy resin up to 0.5 wt% improves the fracture toughness under pure mode II and pure mode III loading with an increasing trend. This is while the improvement under mixed mode II/III loading is reduced by adding nanotubes more than 0.1 wt%. To justify the variations of fracture toughness in terms of nanoparticles content, SEM (scanning electron microscopy) photographs of the fracture surfaces of the specimens in the vicinity of the initial crack front are prepared. Additional fracture mechanisms caused by adding carbon nanotubes are discussed in detail based on the provided SEM images.

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“…Literature review clearly declares that many researchers have focused on the fracture of different materials under combined opening‐in plane shearing, i.e., mixed mode I/II, loading conditions . For example, Campbell and Ritchie measured the mixed mode I/II fracture properies of a turbine blade alloy (Ti‐6Al‐4V) under high‐cycle fatigue loading.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, Aliha and Ayatollahi showed that in the absence of out‐of‐plane loading, the crack extension in a grain cement mortar grows as a combination of mode I and II. Recently, it was observed by Zeinedini et al that a crack in nanocomposites propagates in the mixed mode I/II fracture as it faces with a nanoparticle agglomeration.…”

Section: Introductionmentioning

confidence: 99%

A novel fixture for mixed mode I/II/III fracture testing of brittle materials

Zeinedini

2018

Fatigue Fract Eng Mat Struct

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A novel test‐loading device was suggested in order to study the fracture behavior of brittle materials under mixed mode I/II/III loading conditions. A version of the compact tension shear specimen was used as the test configuration. Using a three‐dimensional finite element analysis, the influence of mode mixity on the stress intensity factors, the T‐stress, and 3‐D plastic zone around the crack tip was investigated. In addition, an experimental study was performed on an epoxy polymer using the proposed setup. Finally, the fracture toughness of pure epoxy was measured under several loading conditions. The numerical and experimental results manifested that the proposed setup is able to determine a full range of mixed mode I/II/III fracture properties. At the end, the fracture envelope obtained using the practical study was compared with various three‐dimensional fracture criteria. A negligible discrepancy was concluded between the practical data and the theoretical data estimated by the maximum mean principle stress criterion.

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The effect of agglomeration on the fracture toughness of CNTs-reinforced nanocomposites

Cited by 67 publications

References 23 publications

Inverse Nacre-like Epoxy-Graphene Layered Nanocomposites with Integration of High Toughness and Self-Monitoring

Inverse Nacre-like Epoxy-Graphene Layered Nanocomposites with Integration of High Toughness and Self-Monitoring

Experimental fracture investigation of CNT/epoxy nanocomposite under mixed mode II/III loading conditions

A novel fixture for mixed mode I/II/III fracture testing of brittle materials

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