Modelling of fibre orientation in fibrous materials

Neckář, Bohuslav; Das, Dipayan

doi:10.1080/00405000.2011.578357

Cited by 13 publications

(19 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the problem of modeling a composite can be treated as a continuum (a solid model without a geometric arrangement of individual components) or by creating a completely new model with structural parameters, that is, the individual components will be included in the structured unit. The problem of analytical modeling of mechanical properties of general fiber structures through a structural unit is described, among others, by Wyk for the study of interfiber contacts [11] and by Neckář [12]. However, the description of the mechanical properties of the fibrous composite structure is more difficult and has not yet been properly described.…”

Section: Analytical Models For the Study Of Mechanical Properties Of mentioning

confidence: 99%

“…is constant, which is for E 22 equal to 1, and for G 12 is equal to 2, M ¼ E or G in the case of an expression E 22 and G 12 according to Eqs. (12)(13)).…”

Section: • Modified Model According To the Mixing Rulementioning

confidence: 99%

“…The second numerical FEM model, which was created in the concept of structure unit, is formed from three components: fiber matrix-the interfacial interface, where the microscopic dimensions of such a model are closer to the more real composite. Such a model can be created from a structural unit with the 1, 2, …,n fibers, wherein the volume geometric configuration (e.g., structural unit is a cube, cuboid, sphere) can affect the volumetric quantity of fibers and a matrix V f ,V m , as shown by Neckář [12]. The change in volume ratio V f can be given on the example of the structural unit of the cuboid, which is shown in the section in Figure 6.…”

Section: Assembling Of Extended Continuous Composite Model Of Long Fimentioning

confidence: 99%

See 2 more Smart Citations

FEM Analysis of Mechanical and Structural Properties of Long Fiber-Reinforced Composites

Petrů¹,

Novák²

2018

Finite Element Method - Simulation, Numerical Analysis and Solution Techniques

View full text Add to dashboard Cite

This chapter deals with studies of the mechanical properties of samples from long fiberreinforced composite structures that would contribute to the optimization of the developed constructions made of them. First, the basic issues of composite structures reinforced with long fibers (carbon or glass) and generally of composites with the specification of parameters that would lead to the optimization of mechanical properties with respect to the theoretical strength are presented. Further, the possibilities and methods of measurements of composite reinforced with carbon and glass fibers are described. This is followed by the introduction of analytical models for the description of the transversal isotropic composite, where these mathematical relations allow the determination of unknown elastic constants and they are also important for the verification of numerical models. Finally, it is comprehensively outlined the problems of creating a numerical model of advanced composite fibrous structure for determining the mechanical properties, both through the description of the continuum, and complex numerical model with a structural configuration enabling approach to allow closer interaction among fibers and matrix. Compared to the averaged values obtained from experimental samples, numerical simulations show a similar trend of stress on strain, with results obtained from simulations.

show abstract

Section: Analytical Models For the Study Of Mechanical Properties Of mentioning

confidence: 99%

“…is constant, which is for E 22 equal to 1, and for G 12 is equal to 2, M ¼ E or G in the case of an expression E 22 and G 12 according to Eqs. (12)(13)).…”

Section: • Modified Model According To the Mixing Rulementioning

confidence: 99%

Section: Assembling Of Extended Continuous Composite Model Of Long Fimentioning

confidence: 99%

See 1 more Smart Citation

FEM Analysis of Mechanical and Structural Properties of Long Fiber-Reinforced Composites

Petrů¹,

Novák²

2018

Finite Element Method - Simulation, Numerical Analysis and Solution Techniques

View full text Add to dashboard Cite

show abstract

“…This method is an intuitive extension of the existing 2D FOD where fibrous assemblies are treated as planar assemblies and presents the in-plane (xy) FOD. As most nonwoven manufacturing methods produce fabrics with a degree of preferential orientation of fibres (Necká & Das, 2011) for ease of visualisation, the range of distribution of and can be presented as (-/2, /2) where = 0 for fibres aligned to MD and = 0 when a fibre segment is parallel to xy plane (in-plane).…”

Section: D Fibre Segment Orientation Distributionmentioning

confidence: 99%

Three-Dimensional Fiber Segment Orientation Distribution Using X-Ray Microtomography

et al. 2014

View full text Add to dashboard Cite

The orientation of fibres in assemblies such as nonwovens has a major influence on the anisotropy of properties of the bulk structure and is strongly influenced by the processes used to manufacture the fabric. To build a detailed understanding of a fabric's geometry and architecture it is important that fibre orientation in three dimensions is evaluated since out of plane orientations may also contribute to the physical properties of the fabric. In this study, a technique for measuring fibre segment orientation as proposed by Eberhardt and Clarke

show abstract

“…Therefore, the determination of directional orientation of any fibrous structure is an important part of quantitative measurements, not only in textile metrology and practice. 1–7…”

mentioning

confidence: 99%

Monitoring homogeneity of textile fiber orientation

Tunák

Antoch

2017

Textile Research Journal

View full text Add to dashboard Cite

Replacement of human control by robotic control is one of the key issues in the textile industry, because it is generally believed that it can decrease the costs of producers on the one hand and increase the satisfaction of clients on the other side. Therefore, this paper deals with the proposal of monitoring homogeneity in fibrous systems when the attention is focused on keeping prescribed directional orientation of fibers. The first part concentrates on the estimation of the orientation of fibers in fibrous systems when the information comes from scanned images of the material. Emphasis is on the use of 2D Fourier transform and a local approach based on idea “conquer and rule”. Such a local approach appears crucial for a proposal how to detect eventual defects, random violation of structural regularity, and such like, when statistical testing of fit is used as a tool. To illustrate the method, it was necessary to prepare data with a prescribed form and orientation of fibers. To that purpose we developed algorithms enabling us to simulate images imitating typical textile fibrous systems with prescribed properties, both containing and not containing defects. Linear and highly nonlinear fibers can be generated. The paper is of a methodological nature, and most of conclusions are based on the analysis of simulated data. Experimental verification of the suggested method is in progress.

show abstract

Modelling of fibre orientation in fibrous materials

Cited by 13 publications

References 17 publications

FEM Analysis of Mechanical and Structural Properties of Long Fiber-Reinforced Composites

FEM Analysis of Mechanical and Structural Properties of Long Fiber-Reinforced Composites

Three-Dimensional Fiber Segment Orientation Distribution Using X-Ray Microtomography

Monitoring homogeneity of textile fiber orientation

Contact Info

Product

Resources

About