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Micromechanics of a compressed fiber mass

Mårten Alkhagen (Institutionen för tillämpad mekanik) ; Staffan Toll (Institutionen för tillämpad mekanik)
Journal of Applied Mechanics-Transactions of the Asme (0021-8936). Vol. 74 (2007), 4, p. 723-731.
[Artikel, refereegranskad vetenskaplig]

A theory is presented for the rate modeling of flexible granular solids based on affine average motion of interparticle contacts. We allow contacts to form and break continually but assume the existence of a finite friction coefficient rendering contacts force free as they form or break. The resulting constitutive equations are of the hypoelastic type. A specific model for the deformation of a fiber mass is then developed. The model improves on previous theories for fiber masses in at least two respects: First, it is more general ill that it is not restricted to uniaxial compression, although it is restricted to predominantly compressive deformations histories, due to neglect of frictional dissipation. Second, by allowing torsion as well as bending of fibers, this theory covers a larger deformation range. Compression experiments are performed on carded slivers of PA6 fibers under various conditions. The measured response is found to be in close agreement with that predicted by the model.

Nyckelord: fiber networks, granular materials, fiber packing, fiber orientation, fiber contact, porous materials, FIBROUS ASSEMBLIES, MODEL, COMPRESSIBILITY, CONTACT, NETWORK

Denna post skapades 2009-01-19.
CPL Pubid: 88522


Institutioner (Chalmers)

Institutionen för tillämpad mekanik (1900-2017)


Teknisk mekanik

Chalmers infrastruktur