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contributor authorAbd El
contributor authorTucker, III ,Charles L.
date accessioned2017-05-09T00:56:18Z
date available2017-05-09T00:56:18Z
date issued2013
identifier issn0021-8936
identifier otherjam_080_05_051007.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/150902
description abstractThe deformation mechanics of dry networks of largeaspectratio fibers with random orientation controls the processing of longfiber thermoplastics (LFTs) and greatly affects the mechanical properties of the final composites. Here, we generate initial geometries of fiber networks in a cubic unit cell with a fiber aspect ratio of l/d = 100 and fully periodic boundary conditions for later numerical simulation. The irreversible random sequential adsorption (RSA) process is first used to generate a quasirandom structure due to the excludedvolume requirements. In order to investigate the nonequilibrium character of the RSA, a second method, which is similar to the mechanical contraction method (MCM) (Williams and Philipse, 2003, “Random Packings of Spheres and Spherocylinders Simulated by Mechanical Contraction,â€‌ Phys. Rev. E, 67, pp. 1–9) and based on a simplified Metropolis Monte Carlo (MC) simulation is then developed to produce quasiequilibrium fiber geometries. The RSA packing results (د• ≈ 4.423% when using a fiber aspect ratio of 100) are in good agreement with the maximum unforced random packing limits (Evans and Gibson, 1986, “Prediction of the Maximum Packing Fraction Achievable in Randomly Oriented ShortFibre Composites,â€‌ Compos. Sci. Technol., 25, pp. 149–162). The fiber structures were characterized by several distribution functions, including pairspatial and pairorientation distributions, based on either the centertocenter distance or the shortest distance between the particles. The results show that the structures generated by the RSA have an easilydetectable longrange spatial correlation but very little orientational correlation. In contrast, the quasiequilibrium structures have reduced spatial correlation but increased shortrange orientational correlation.
publisherThe American Society of Mechanical Engineers (ASME)
titleMechanics of Random Discontinuous Long Fiber Thermoplastics—Part I: Generation and Characterization of Initial Geometry
typeJournal Paper
journal volume80
journal issue5
journal titleJournal of Applied Mechanics
identifier doi10.1115/1.4023537
journal fristpage51007
journal lastpage51007
identifier eissn1528-9036
treeJournal of Applied Mechanics:;2013:;volume( 080 ):;issue: 005
contenttypeFulltext


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