Mechanical analysis of bi-component-fibre nonwovens: Finite-element strategy |
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| Affiliation: | 1. Wolfson School of Mechanical and Manufacturing Engineering, Loughborough University, UK;2. Nonwovens Cooperative Research Center, North Carolina State University, Raleigh, NC, USA;1. Physics Department, Dillard University, New Orleans, LA 70122, United States;2. SSS optical Technologies, 515 Sparkman Drive, Huntsville, AL 35816, United States;3. Mathematics & Physics Department, Oakwood University, 7000 Adventist Blvd, Huntsville, AL 35896, United States;4. Chemistry Department, Tulane University, New Orleans, LA 70122, United States;5. Mechanical Engineering Department, University of New Orleans, New Orleans, LA 70148, United States;1. Institute of Physics, Azerbaijan National Academy of Sciences, Javid.pr, 131, Baku AZ 1143, Azerbaijan;2. Baku State University, Department of Chemistry, Z. Khalilov str., 23, AZ-1148 Baku, Azerbaijan;1. NDT Ingenieros, Madrid, Spain;2. Building Engineering School, University of Granada, 18071 Granada, Spain;3. Industrial Technical Engineering School, University of the Basque Country, Bilbao, Spain;1. Institute of Applied Mechanics (CE) Chair I, University of Stuttgart, 70550 Stuttgart, Pfaffenwaldring 7, Germany;2. Department of Civil and Environmental Engineering, Stanford University, Stanford, CA 94305, USA;1. Department of Textile Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;2. School of Chemical and Process Engineering, University of Leeds, LS2 9JT Leeds, UK |
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| Abstract: | In thermally bonded bi-component fibre nonwovens, a significant contribution is made by bond points in defining their mechanical behaviour formed as a result of their manufacture. Bond points are composite regions with a sheath material reinforced by a network of fibres’ cores. These composite regions are connected by bi-component fibres — a discontinuous domain of the material. Microstructural and mechanical characterization of this material was carried out with experimental and numerical modelling techniques. Two numerical modelling strategies were implemented: (i) traditional finite element (FE) and (ii) a new parametric discrete phase FE model to elucidate the mechanical behaviour and underlying mechanisms involved in deformation of these materials. In FE models the studied nonwoven material was treated as an assembly of two regions having distinct microstructure and mechanical properties: fibre matrix and bond points. The former is composed of randomly oriented core/sheath fibres acting as load-transfer link between composite bond points. Randomness of material’s microstructure was introduced in terms of orientation distribution function (ODF). The ODF was obtained by analysing the data acquired with scanning electron microscopy (SEM) and X-ray micro computed tomography (CT). Bond points were treated as a deformable two-phase composite. An in-house algorithm was used to calculate anisotropic material properties of composite bond points based on properties of constituent fibres and manufacturing parameters such as the planar density, core/sheath ratio and fibre diameter. Individual fibres connecting the composite bond points were modelled in the discrete phase model directly according to their orientation distribution. The developed models were validated by comparing numerical results with experimental tensile test data, demonstrating that the proposed approach is highly suitable for prediction of complex deformation mechanisms, mechanical performance and structure-properties relationships of composites. |
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| Keywords: | A Fabrics/textiles A Fibres B Mechanical properties C Finite element analysis (FEA) |
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