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A Fundamental Study of the Fracture and Fatigue Characteristics of Single Wood Pulp Fibres

1994
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Release : 1994
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Book Synopsis A Fundamental Study of the Fracture and Fatigue Characteristics of Single Wood Pulp Fibres by : Wadwood Y. Hamad

Download or read book A Fundamental Study of the Fracture and Fatigue Characteristics of Single Wood Pulp Fibres written by Wadwood Y. Hamad. This book was released on 1994. Available in PDF, EPUB and Kindle. Book excerpt: "The engendered conclusions may be summed up as follows. From a litany of tenuously-oriented microcracks, dominant macrocracks propagate along the axis of the fibre which may sharply deflect in the presence of natural bias (e.g. pits in the fibre wall). The material property degradation characteristics further include: volumetric expansion due to internal fibrillation in the cell wall, extensive external fibrillation, gradual delamination of the layers and partial peeling-off of the cell wall material. Cumulative damage due to cyclic shear is shown to be the most significant, further supported by the high structural collapsibility of the fibre wall layers. The mechanisms of fracture are either due to the development of transverse cracks at regions of high stress concentration (such as bordered pits), or owing to the gradual slippage of the fibre wall layers." --

A Fundamental Study of the Fracture and Fatigue Characteristics of Single Wood Pulp Fibres [microform] : Application to Mechanical Refiners

1994
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Release : 1994
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Kind : eBook
Book Rating : 293/5 ( reviews)

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Book Synopsis A Fundamental Study of the Fracture and Fatigue Characteristics of Single Wood Pulp Fibres [microform] : Application to Mechanical Refiners by : Wadood Y. (Wadood Yasser) Hamad

Download or read book A Fundamental Study of the Fracture and Fatigue Characteristics of Single Wood Pulp Fibres [microform] : Application to Mechanical Refiners written by Wadood Y. (Wadood Yasser) Hamad. This book was released on 1994. Available in PDF, EPUB and Kindle. Book excerpt: "The engendered conclusions may be summed up as follows. From a litany of tenuously-oriented microcracks, dominant macrocracks propagate along the axis of the fibre which may sharply deflect in the presence of natural bias (e.g. pits in the fibre wall). The material property degradation characteristics further include: volumetric expansion due to internal fibrillation in the cell wall, extensive external fibrillation, gradual delamination of the layers and partial peeling-off of the cell wall material. Cumulative damage due to cyclic shear is shown to be the most significant, further supported by the high structural collapsibility of the fibre wall layers. The mechanisms of fracture are either due to the development of transverse cracks at regions of high stress concentration (such as bordered pits), or owing to the gradual slippage of the fibre wall layers." --

Fracture and Fatigue in Wood

2003-06-02 Technology & Engineering
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Release : 2003-06-02
Genre : Technology & Engineering
Kind : eBook
Book Rating : 081/5 ( reviews)

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Book Synopsis Fracture and Fatigue in Wood by : Ian Smith

Download or read book Fracture and Fatigue in Wood written by Ian Smith. This book was released on 2003-06-02. Available in PDF, EPUB and Kindle. Book excerpt: Damage in wood is principally the result of fatigue. Fatigue is the process of progressive localised irreversible change in a material, and may culminate in cracks or complete fracture if conditions that initiated or propagated the process persist. Comprehensive understanding of fatigue and fracture in engineered wood components must be founded on a proper understanding of the damage processes. Although wood is the world's most widely used structural material, whether measured by volume consumed or value of finished construction, its behaviour is not well understood even by people who have spent their careers studying it. * What is known about failure processes comes almost entirely from empirical evidence collected for engineering purposes. * Hypotheses about behaviour of wood are based on macroscopic observation of specimens during and following tests. * With only limited resources and the need to obtain practical results quickly, the timber engineering research community has steered away from the scientific approach. * Forestry practices are changing and are known to influence characteristics of wood cells therefore there is a need to periodically reassess the mechanical properties of visually graded lumber the blackbox approach. Fatigue and Fracture of Wood examines the above issues from a scientific point of view by drawing on the authors' own research as well as previously published material. Unlike the empirical research, the book begins by examining growth of wood. It briefly examines its structure in relation to how trees grow, before assessing the fatigue and fracture of wood and discussing the scientific methods of modelling fatigue. * Covers from macro to micro behaviour of wood * Presents direct evidence of how wood fractures using Scanning Electron Microscopy * The first book to present a physically correct model for fracture in wood * Provides experimental proof of so-called memory in wood (i.e. dependence of fatigue behaviour on the loading sequence) * Givse practical illustrations of how theories and models can be applied in practice An essential resource for wood scientists/engineers, timber-engineering practitioners, and graduate students studying wood and solid mechanics.

Micromechanical Properties and Fracture Mechanisms of Single Wood Pulp Fibers

1995 Wood-pulp
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Release : 1995
Genre : Wood-pulp
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Book Synopsis Micromechanical Properties and Fracture Mechanisms of Single Wood Pulp Fibers by : Laurence Mott

Download or read book Micromechanical Properties and Fracture Mechanisms of Single Wood Pulp Fibers written by Laurence Mott. This book was released on 1995. Available in PDF, EPUB and Kindle. Book excerpt:

Cellulosic Materials

2013-11-27 Technology & Engineering
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Release : 2013-11-27
Genre : Technology & Engineering
Kind : eBook
Book Rating : 258/5 ( reviews)

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Book Synopsis Cellulosic Materials by : Wadood Y. Hamad

Download or read book Cellulosic Materials written by Wadood Y. Hamad. This book was released on 2013-11-27. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this book are twofold: 1. To provide a thorough examination of the materials science of cellulosic fibers with emphasis on the characterization of structure-property relations, and 2. To advance knowledge of how to best analyze cellulosic fibrous networks and composites, and, ultimately, engineer "novel" cellulose-based systems of superior performance and functionality. The design of new materials through the study of living systems, or bio-imitation, is burgeoning to become an established field, generally referred to as biomimetics. The latter, as with materials science, in general, prominently features multi-disciplinarity where new developments in mathematics, physics, chemistry and engineering continue to inspire novel areas of research and development. The book is structured in five chapters which provide a sequential treatment of the running theme: deformation mechanics and the physical, morphological and mechanical characterization of native cellulose fibers networks and composites. The heart of the book is Chapter 3, Damage Accumulation in Fibers, which treats the experimental methodology for fatigue testing of single fibers and the engendered results. In-depth examinations of the morphology, structure and chemical composition of native cellulose fibers, and the mechanics of deformation in these natural composite fibers are proffered in Chapters 1 and 2, respectively. The fourth chapter, Fractal Simulation of Crack Propagation, presents a fractal-based approach to modeling damage accumulation in materials. Fractals lend themselves well to modeling such randomly-oriented phenomena as crack propagation and fracture. The last chapter, Fibrous Structures: Networks and Composites, comprises analytical approaches for handling networks and composites.

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