Elasticity of planar fiber networks

Wu, Xiang‐Fa; Dzenis, Yuris A.

doi:10.1063/1.2123369

Cited by 106 publications

(49 citation statements)

References 43 publications

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“…It was found that the stable jet exists in the radius range less than a critical value defined by the dielectric properties and surface tension of the fluid. The process of jet initiation was analyzed as an electrical 14 break-up of a charged meniscus. The surface shape was defined by the balance of the hydrostatic pressure, surface tension, and electric forces resulting from interactions of the electric field with free charges and dielectric polarization of the fluid.…”

Section: Nanomanufacturing Of High-performance Nanofibers For Next Gementioning

confidence: 99%

High-Performance Digital Imaging System for Development and Characterization of Novel Materials and Processes

Dzenis¹,

Feng²

2006

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information AFRL-SR-AR-TR-07-00 7 7 SUPPLEMENTARY NOTES ABSTRACTThe objective of this DURIP project was to acquire a new high-performance digital imaging system for visualization and quantitative characterization of high-speed dynamic fracture in advanced composite materials and flow instabilities in nanomanufacturing processes. Full-field dynamic stress analysis of fracture required high spatial resolution while ballistic processes needed ultrahigh-speed imaging.Observations of jet motion and instabilities in nanofiber manufacturing required flexible frame rate and long time (high frame number) videography. As a result of thorough market search, a system of three cameras was selected and acquired, including ultrahigh-spatial resolution Model 550-24 rotating mirror CCD camera by Cordin, ultrahigh-speed Model 214-8 image-intensified gated CCD camera by Cordin, and flexible, ultrahigh-frame number HG-I 00K color CMOS camera by Redlake. The cameras have overlapping resolution, recording rate/length, and sensitivity performance characteristics. This unique, state-of-the-art ultrahigh-resolution/speed imaging system will be used for quantitative experimental characterization of impact fracture and ballistic performance of novel advanced laminated composites with nanofiber-reinforced ply interfaces and for observation of electrohydrodynamic jet instabilities in electrospinning process. The objective of this DURIP project was to acquire a new ultrahigh-performance digital imaging system for visualization and quantitative characterization of high-speed dynamic fracture in advanced composite materials and flow instabilities in nanomanufacturing processes. Full-field dynamic stress analysis of fracture required high spatial resolution while ballistic processes needed ultrahigh-speed imaging. Observations of jet motion and instabilities in nanofiber manufacturing by electrospinning required flexible frame rate and long time (high frame number) videography. As a result of a thorough market search, it was concluded that no single camera was capable of satisfying these conflicting requirements. A system of three cameras was selected and acquired. The system included an ultrahigh-spatial resolution Model 550-24 rotating mirror CCD camera by Cordin, an ultrahigh-speed Model 214-8 image-intensified gated CCD camera by Cordin, and a flexible, ultrahigh-frame number HG-1OOK color CMOS camera by Redlake. These cameras have overlapping resolution, recording rate/length, and sensitivity performance characteristics. Together, they r...

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Section: Nanomanufacturing Of High-performance Nanofibers For Next Gementioning

confidence: 99%

High-Performance Digital Imaging System for Development and Characterization of Novel Materials and Processes

Dzenis¹,

Feng²

2006

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“…The stiffness is given as a function of only a few parameters: the degree of bonding, the dimensions of the fibres, the elastic constants of the fibre material and the density of fibres. A very similar micromechanics model is given in [16] for the elasticity of planar fibre networks made from short fibres. The rods are still bonded rigidly at contacts in [16] and under external in-plane loading.…”

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confidence: 99%

Influence of van der Waals forces on increasing the strength and toughness in dynamic fracture of nanofibre networks: a peridynamic approach

Bobaru

2007

Modelling Simul. Mater. Sci. Eng.

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The peridynamic method is used here to analyse the effect of van der Waals forces on the mechanical behaviour and strength and toughness properties of three-dimensional nanofibre networks under imposed stretch deformation. The peridynamic formulation allows for a natural inclusion of long-range forces (such as van der Waals forces) by considering all interactions as 'long-range'. We use van der Waals interactions only between different fibres and do not need to model individual atoms. Fracture is introduced at the microstructural (peridynamic bond) level for the microelastic type bonds, while van der Waals bonds can reform at any time. We conduct statistical studies to determine a certain volume element for which the network of randomly oriented fibres becomes quasi-isotropic and insensitive to statistical variations. This qualitative study shows that the presence of van der Waals interactions and of heterogeneities (sacrificial bonds) in the strength of the bonds at the crosslinks between fibres can help in increasing the strength and toughness of the nanofibre network. Two main mechanisms appear to control the deformation of nanofibre networks: fibre reorientation (caused by deformation and breakage) and fibre accretion (due to van der Waals interaction). Similarities to the observed toughness of polymer adhesive in the abalone shell composition are explained.

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“…Computation time is therefore one of the primary concerns associated with meso-scale FEA models for DFC materials. 2D models are the most computationally inexpensive option, using 1D linear beam elements to represent fibre bundles randomly distributed in 2D space [7,[22][23][24][25][26]. However, this approach overlooks fibre crimping and allows bundle-bundle penetration, as all bundles are deposited on the same plane, reducing accuracy.…”

Section: Introductionmentioning

confidence: 99%

3D geometric modelling of discontinuous fibre composites using a force-directed algorithm

Harper

Qian

Luchoo

et al. 2016

Journal of Composite Materials

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A geometrical modelling scheme is presented to produce representative architectures for discontinuous fibre composites, enabling downstream modelling of mechanical properties. The model generates realistic random fibre architectures containing high filament count bundles (>3k) and high (~50%) fibre volume fractions. Fibre bundles are modelled as thin shells using a multi-dimension modelling strategy, in which fibre bundles are distributed and compacted to simulate pressure being applied from a matched mould tool. FE simulations are performed to benchmark the in-plane mechanical properties obtained from the numerical model against experimental data, with a detailed study presented to evaluate the tensile properties at various fibre volume fractions and specimen thicknesses. Tensile modulus predictions are in close agreement (less than 5% error) with experimental data at volume fractions below 45%.Ultimate tensile strength predictions are within 4.2% of the experimental data at volume fractions between 40%-55%. This is a significant improvement over existing 2D modelling approaches, as the current model offers increased levels of fidelity, capturing dominant failure mechanisms and the influence of out-of-plane fibres.

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Elasticity of planar fiber networks

Cited by 106 publications

References 43 publications

High-Performance Digital Imaging System for Development and Characterization of Novel Materials and Processes

High-Performance Digital Imaging System for Development and Characterization of Novel Materials and Processes

Influence of van der Waals forces on increasing the strength and toughness in dynamic fracture of nanofibre networks: a peridynamic approach

3D geometric modelling of discontinuous fibre composites using a force-directed algorithm

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