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Creep Rupture Behavior Of Wood
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Book Synopsis Creep and Creep-rupture Behavior of Wood-based Structural Panels by : Theodore Laufenberg
Download or read book Creep and Creep-rupture Behavior of Wood-based Structural Panels written by Theodore Laufenberg and published by . This book was released on 1999 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper summarizes a cooperative research program between the USDA Forest Service, Forest Products Laboratory (FPL), in Madison, Wisconsin, and Forintek Canada Corp. in Vancouver, British Columbia, Canada. This research program provided detailed creep--rupture and some creep information for composite panel products. Commercially produced plywood, oriented strandboard (OSB), and minimally aligned waferboard were tested to identify nine mills (three for each product) that produced panels with a range of flexural creep performance. The three plywood, three OSB, and three waferboard products (nine products total, one from each mill) were then tested to provide information on their duration of load (DOL) and creep performance. Large panel specimens were subjected to both rampload and constant-load tests under one environmental condition. The constant-load results provided conventional or deterministic DOL factors that compared favorably with National Design Specifications recommended for adjusting lumber design strength properties under dry service conditions. Ramp-load specimen data generally indicated a lower rate of damage accumulation than did data for constant-load specimens. Creep tests at two low constant-load levels were also performed on large specimens under three environmental conditions for a 6-month period. Those results suggested that present deterministic creep factors in panel design practice might be acceptable for plywood under the influence of relatively severe conditions, for OSB in moderate conditions, and for waferboard in dry service environmental conditions.
Book Synopsis Creep and Creep-rupture Behavior of Wood-based Structural Panels by : Theodore L. Laufenberg
Download or read book Creep and Creep-rupture Behavior of Wood-based Structural Panels written by Theodore L. Laufenberg and published by . This book was released on 1999 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Creep Rupture Behavior of Wood by : Kenneth Jon Fridley
Download or read book Creep Rupture Behavior of Wood written by Kenneth Jon Fridley and published by . This book was released on 1992 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Creep and Creep-rupture Behaviour of Wood-based Structural Panels by : Theodore L. Laufenberg
Download or read book Creep and Creep-rupture Behaviour of Wood-based Structural Panels written by Theodore L. Laufenberg and published by . This book was released on 1994 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Creep in Timber Structures by : P. Morlier
Download or read book Creep in Timber Structures written by P. Morlier and published by CRC Press. This book was released on 2004-03-01 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book brings together up to date information from research and practice about the interaction between moisture changes and mechanical loading, which may lead to excessive deflections or joint movements in timber structures. It has important applications in timber engineering, and consequences for national and international structural codes of practice.
Book Synopsis Fracture and Fatigue in Wood by : Ian Smith
Download or read book Fracture and Fatigue in Wood written by Ian Smith and published by John Wiley & Sons. This book was released on 2003-06-02 with total page 248 pages. 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.
Book Synopsis Creep Behavior of Wood at Low Stress by : Robert W. Davidson
Download or read book Creep Behavior of Wood at Low Stress written by Robert W. Davidson and published by . This book was released on 1960 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Concise Encyclopedia of Composite Materials by : Andreas Mortensen
Download or read book Concise Encyclopedia of Composite Materials written by Andreas Mortensen and published by Elsevier. This book was released on 2006-12-08 with total page 989 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concise Encyclopedia of Composite Materials draws its material from the award-winning Encyclopedia of Materials: Science and Technology, and includes updates and revisions not available in the original set. This customized collection of articles provides a handy reference for materials scientists and engineers with an interest in composite materials made from polymers, metals, ceramics, carbon, biocomposites, nanocomposites, wood, cement, fibers, etc. Brings together articles from the Encyclopedia of Materials: Science & Technology that focus on the essentials of composite materials, including recent updates Every article has been commissioned and written by an internationally recognized expert and provides a concise overview of a particular aspect of the field Enables rapid reference; extensive bibliographies, cross-referencing and indexes guide the user to the most relevant reading in the primary literature Covers areas of active research, such as biomaterials and porous materials
Download or read book Research Paper FPL-RP written by and published by . This book was released on 1986 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dividends from Wood Research written by and published by . This book was released on 1991-07 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Load-duration Behavior of Extruded Wood-plastic Composites by : Christopher Wayne Brandt
Download or read book Load-duration Behavior of Extruded Wood-plastic Composites written by Christopher Wayne Brandt and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the important characteristics affecting many materials including wood, plastic, and wood-plastic composites is their time-dependent behavior. This behavior can be divided into two separate, yet related, phenomena known as creep and creep-rupture. Creep is the increase in deformation over time while subjected to a sustained load. Creep-rupture, or load-duration behavior, is the eventual failure to sustain a constant load due to increased deformation over time. Both have a considerable effect on wood-plastic composite members and must be accounted for in design. The load-duration, or creeprupture, behavior of wood and traditional wood composite products has been studied extensively by numerous researchers, and simplified design procedures to account for both effects are in place. However, the load-duration behavior of composite products made out of the combination of wood and plastic is not well understood or documented. Currently, wood-plastic composite products are available on the commercial market, yet no standardized design procedures to account for creep or duration-of-load effects exist. Given the lack of understanding of the load-duration behavior of wood-plastic composites, a research effort was initiated to investigate the load-duration behavior of various wood-plastic composite formulations and to compare the observed behavior to that of solid sawn lumber. An exponential damage rate model commonly used for solid wood was found to similarly describe the load-duration effect for wood-plastic composites. Proposed adjustment factors were developed following existing procedures for wood products. It was also found that the current adjustment factors, as found in the 1997 edition of the National Design Specification for Wood Construction, can be conservatively applied to wood-plastic composite products, although the adjustment is overly conservative for the materials tested. However, applying adjustment factors based on a short-duration loading was found to be non-conservative. Rate-of-load effects on flexural properties were also experimentally investigated. It was found that a rate-of-load effect existed for both modulus of rupture and modulus of elasticity over certain ranges of load-rate values. A rate-of-loading corresponding to 0.01 mm/mm/min was found to produce representative material properties that were slightly conservative
Book Synopsis The Influence of Moisture on Creep of Wood by : Lajos Louis Julius Nemeth
Download or read book The Influence of Moisture on Creep of Wood written by Lajos Louis Julius Nemeth and published by . This book was released on 1964 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Duration-of-load and Creep Effects in Thick MPB Strand Based Wood Composite by :
Download or read book Duration-of-load and Creep Effects in Thick MPB Strand Based Wood Composite written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: British Columbia (BC) is in the midst of the largest outbreak of the Mountain Pine Beetle (MPB) ever recorded in western Canada. Technologies capable of converting stained lumber into market acceptable products are urgently required to reduce the impact of the growing volume of MPB killed lumber on the profitability of forestry in BC. New, thick MPB strand-based structural composite products can be produced and help absorb a large volume of MPB wood. With appropriate mechanical properties, such products can be used as beams, headers, and columns in the low-rise commercial, multi-family residential and single family residential markets. This work was focused on the duration-load and creep behaviour of thick MPB strand-based wood composite. The beam specimens were made in the Timber Engineering and Applied Mechanics Laboratory at UBC. A series of tests were conducted on the matched groups to investigate the creep-rupture behaviour. These investigations comprised of ramp load tests at three loading rates, long-term constant load tests at two stress levels and cyclic bending tests at six stress levels. A damage accumulation model was developed to study the creep-rupture behaviour. This model stipulates that the rate of damage growth is given in terms of the current strain rate and the previously accumulated damage, and a 5-parameter rheological model is applied to describe the viscoelastic constitutive relationship to represent the time-dependent strain, while the damage accumulation law acts as the failure criterion. The results of the long-term constant load tests were then interpreted by means of the creep-rupture model which had been shown to be able to represent the time-dependent deflection and time-to-failure data for different stress levels. The predictions of the model were verified using results from ramp load tests at different loading rates and results from cyclic loading tests at different stress levels. The creep-rupture model incorporates the short term s.
Download or read book Station Bulletin written by and published by . This book was released on 1973 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Creep Rupture Behavior of Notched Bars of IN-X750 by : Ioannis Platon Vasatis
Download or read book The Creep Rupture Behavior of Notched Bars of IN-X750 written by Ioannis Platon Vasatis and published by . This book was released on 1986 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Creep and Fatigue in Polymer Matrix Composites by : Rui Miranda Guedes
Download or read book Creep and Fatigue in Polymer Matrix Composites written by Rui Miranda Guedes and published by Woodhead Publishing. This book was released on 2019-03-14 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: Creep and Fatigue in Polymer Matrix Composites, Second Edition, updates the latest research in modeling and predicting creep and fatigue in polymer matrix composites. The first part of the book reviews the modeling of viscoelastic and viscoplastic behavior as a way of predicting performance and service life. Final sections discuss techniques for modeling creep rupture and failure and how to test and predict long-term creep and fatigue in polymer matrix composites. Reviews the latest research in modeling and predicting creep and fatigue in polymer matrix composites Puts a specific focus on viscoelastic and viscoplastic modeling Features the time-temperature-age superposition principle for predicting long-term response Examines the creep rupture and damage interaction, with a particular focus on time-dependent failure criteria for the lifetime prediction of polymer matrix composite structures that are illustrated using experimental cases
Download or read book Energy Research Abstracts written by and published by . This book was released on 1992 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt:
