Fracture behavior of nanotube–polymer composites: Insights on surface roughness and failure mechanism

Shtein, Michael; Nadiv, Roey; Lachman, Noa; Wagner, H. Daniel; Regev, Oren

doi:10.1016/j.compscitech.2013.07.016

Cited by 94 publications

(63 citation statements)

References 47 publications

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“…8 Shtein et al 34 found a coherent quantitative correlation for epoxy-WS 2 nanocomposites. Table 3 lists two different roughness parameters for fracture surfaces as investigated with AFM: R rms is the root-mean square roughness and d A 5ðA surf =A proj Þ21, where A surf is the measured surface area and A proj is the projected image area.…”

Section: Figurementioning

confidence: 98%

Significance of epoxy network properties for the toughening effect of flaky and fullerene‐like WS₂ nanoparticles

Haba

Barbezat

Ayalur-Karunakaran

et al. 2016

J Polym Sci B Polym Phys

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This work deals with the toughening effect of flaky WS 2 and fullerene-like WS 2 (IF-WS 2 ) nanoparticles on epoxy with varying network properties. Reducing the amount of curing agent resulted in decreased crosslink density as measured by dynamic-mechanic analysis and double-quantum nuclear magnetic resonance spectroscopy. Although that lead to moderate changes in the epoxy's tensile properties, its fracture toughness dropped drastically, probably due to an increased defect fraction. IF-WS 2 could be dispersed significantly more effectively within epoxy resin than flaky WS 2 , possibly due to its spherical shape, but caused less toughening. IF-WS 2 tended to debond from the epoxy, while flaky WS 2 introduced more secondary cracks. Both increased the fracture toughness of the (brittle) substoichiometric, but not that of the (tough) stoichiometric epoxy, possibly due to their interaction with molecular defects. Irrespective of which mechanism resulted in the toughening effect, its effectiveness depended strongly on the epoxy matrix.

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Section: Figurementioning

confidence: 98%

Significance of epoxy network properties for the toughening effect of flaky and fullerene‐like WS₂ nanoparticles

Haba

Barbezat

Ayalur-Karunakaran

et al. 2016

J Polym Sci B Polym Phys

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show abstract

“…This can be attributed to the fact that high concentration composites exhibited a significant increase in viscosity during shear processing. Moreover, the composites reached nanotube gelation after only one or two passes through the mill, and after 10 passes the composites had the consistency of a paste [41][42][43][44].…”

Section: Resultsmentioning

confidence: 97%

Processing-structure–property relationships of SWNT–epoxy composites prepared using ionic liquids

Watters

Cuadra

Kontsos

et al. 2015

Composites Part A: Applied Science and Manufacturing

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“…An optical microscope image shows the baseline fracture surface with a smooth and shiny character including riverlines radiating from the notch tip. The PNC fracture looks similary flat at a macroscale, but has a rougher surface at the microscale, indicating the potential for increased toughness 16 . In addition, the fractured surface reveals a key morphological feature of the 1% Vf aligned CNT PNCs.…”

Section: Resultsmentioning

confidence: 99%

Fracture Toughness of Aligned Carbon Nanotube Polymer Nanocomposites for the Reinforcement of Hierarchical Composite Materials

Wicks

Wardle

2014

55th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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Aligned carbon nanotubes (CNTs) are being investigated for application to numerous material disciplines including structural composite materials due to their unique scaledependent physical properties. Nanoengineered architectures called Fuzzy Fiber Reinforced Plastics (FFRP) have been developed, where CNTs are grown radially on advanced fibers and extend into inter and intralaminar spaces. The aligned CNT forests induce a swelling of the tows and cloth causing fibers to spread apart, and the demonstrated improvements in Mode I toughness could be attributed to changes in matrix properties, interlaminar region morphology due to the swelling of the plies, or a combination of both. The work here aims to decouple the two effects by determining the toughness of the matrix region in the absence of fibers, employing aligned-CNT polymer nanocomposites with relevant CNT loadings (volume fractions). A single edge notch beam specimen has been demonstrated to isolate the fracture toughness of such aligned-CNT reinforced polymer nanocomposites. Nomenclature CNT= carbon nanotube CVD = chemical vapor deposition DCB = double cantilever beam KIc = Mode I critical stress intensity FFRP = fuzzy fiber reinforced plastic FRP = fiber reinforced plastic PNC = polymer nanocomposite RVE = representative volume element SEM = scanning electron microscope SENB = single edge notch beam Vf = volume fraction I. Introduction arbon nanotubes (CNTs) are being investigated for application to numerous material disciplines including structural composite materials due to their unique scale-dependent and intrinsic physical properties. 1 With high specific strength and stiffness and nanoscale dimensions, 2 aligned CNTs are an attractive candidate for incorporation into laminated composites, including interlaminar reinforcement. Mechanical properties that are limited by the matrix-dominated interlaminar region in traditional composites are typically reinforced through changing the fiber architecture as in stitching/weaving or modifying the matrix properties through tougheners and additives. 3 Nanoengineered architectures integrate both approaches, as realized in Fuzzy Fiber Reinforced Plastics (FFRP) where aligned CNTs are grown radially on advanced fibers and extend into inter and intralaminar spaces as shown in Figure 1. 4,5 The aligned-CNT forests induce a swelling of the cloth tows causing fibers to spread out and apart, and the demonstrated improvements in Mode I toughness could be attributed to either the changes in matrix properties or the morphological change of the interlaminar region due to the swelling of the plies, or a complex combination of both. The work here aims to decouple the two effects by determining the toughness of the matrix

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Fracture behavior of nanotube–polymer composites: Insights on surface roughness and failure mechanism

Cited by 94 publications

References 47 publications

Significance of epoxy network properties for the toughening effect of flaky and fullerene‐like WS₂ nanoparticles

Significance of epoxy network properties for the toughening effect of flaky and fullerene‐like WS₂ nanoparticles

Processing-structure–property relationships of SWNT–epoxy composites prepared using ionic liquids

Fracture Toughness of Aligned Carbon Nanotube Polymer Nanocomposites for the Reinforcement of Hierarchical Composite Materials

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Fracture behavior of nanotube–polymer composites: Insights on surface roughness and failure mechanism

Cited by 94 publications

References 47 publications

Significance of epoxy network properties for the toughening effect of flaky and fullerene‐like WS2 nanoparticles

Significance of epoxy network properties for the toughening effect of flaky and fullerene‐like WS2 nanoparticles

Processing-structure–property relationships of SWNT–epoxy composites prepared using ionic liquids

Fracture Toughness of Aligned Carbon Nanotube Polymer Nanocomposites for the Reinforcement of Hierarchical Composite Materials

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Product

Resources

About

Significance of epoxy network properties for the toughening effect of flaky and fullerene‐like WS₂ nanoparticles

Significance of epoxy network properties for the toughening effect of flaky and fullerene‐like WS₂ nanoparticles