Cellulosic Materials: Fibers, Networks and Composites by Wadood Y. Hamad

By Wadood Y. Hamad

The goals of this publication are twofold: 1. to supply an intensive exam of the fabrics technological know-how of cellulosic fibers with emphasis at the characterization of structure-property kin, and a pair of. To enhance wisdom of the way to most sensible research cellulosic fibrous networks and composites, and, eventually, engineer "novel" cellulose-based structures of greater functionality and performance. The layout of recent fabrics throughout the research of dwelling platforms, or bio-imitation, is burgeoning to develop into a longtime box, as a rule known as biomimetics. The latter, as with fabrics technology, in most cases, prominently positive aspects multi-disciplinarity the place new advancements in arithmetic, physics, chemistry and engineering proceed to motivate novel parts of analysis and improvement.
The booklet is dependent in 5 chapters which offer a sequential therapy of the working subject matter: deformation mechanics and the actual, morphological and mechanical characterization of local cellulose fibers networks and composites.
the center of the ebook is bankruptcy three, harm Accumulation in Fibers, which treats the experimental method for fatigue trying out of unmarried fibers and the engendered effects. In-depth examinations of the morphology, constitution and chemical composition of local cellulose fibers, and the mechanics of deformation in those usual composite fibers are proffered in Chapters 1 and a pair of, respectively.
The fourth bankruptcy, Fractal Simulation of Crack Propagation, provides a fractal-based method of modeling harm accumulation in fabrics. Fractals lend themselves good to modeling such randomly-oriented phenomena as crack propagation and fracture.
The final bankruptcy, Fibrous constructions: Networks and Composites, includes analytical techniques for dealing with networks and composites.

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Extra info for Cellulosic Materials: Fibers, Networks and Composites

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Another feature is that large plastic deformations under stress are highly improbable because the inter-molecular forces of attraction prevent any extensive relative movements [277]. It was indicated by Klauditz [220] that cellulose was primarily but not exclusively the load-bearing material of the cell wall; moreover, a lack of an appreciable stabilizing matrix does prevent the helically-wound cellulose chains from exerting their full structural capacity. Thus it appears that Freudenberg's original concept [125] (refer to The Physical Nature of Cell Wall Structure below) of the cell wall as a composite of structural reinforcing materials in a cementing matrix is indeed valid.

_ -.. 6: Constituents of wood (adapted from reference [58]). Cellulose Cellulose, or poly(anhydro-,6-1, 4-glucopyranose), exists in nature as a polydisperse, linear, crystalline (polysaccharide) macromolecule of high molecular weight having a high degree of polymerization [139, 271]: typically between 10000 and 15000 glucose residues depending upon the source of cellulose. Wood cellulose does not have a particularly high molecular weight, and the highest molecular weight celluloses are generally obtained from non-woody sources such as flax and cotton.

Without this principle an exceedingly large portion of applied mathematics and mechanical engineering may be rendered meaningless. There are four major characteristics of stress that need be specified: (1) the physical dimensions of stress are force per unit area, (2) stress is defined at a point upon an imaginary plane or boundary dividing the material into two parts, (3) stress is a vector equivalent to the action of one part of the material upon another, and (4) the direction of the stress vector is not restricted.

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