Author: Forest Products Laboratory (U.S.)Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 112
Book Description
Information for Inspectors of Airplane Wood
Author: Forest Products Laboratory (U.S.)Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 112
Book Description
Information for Inspectors of Airplane Wood
Author: United States. Bureau of Aircraft Production. Inspection DepartmentPublisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 116
Book Description
Information for Inspectors of Airplane Wood; Prepared at the Forest Products Laboratory, Forest Service, U.S. Department of Agriculture
Author: United States Bureau of Aircraft ProducPublisher:
ISBN: 9781375960151
Category : History
Languages : en
Pages : 114
Book Description
Information for Inspectors of Airplane Wood
Author: Publisher:
ISBN: 9781332290178
Category : Technology & Engineering
Languages : en
Pages : 112
Book Description
Excerpt from Information for Inspectors of Airplane Wood: Prepared at the Forest Products Laboratory, Forest Service, U. S. Department of Agriculture Strength, in the broad sense of the word, is the summation of the mechanical properties of a material or its ability to resist stresses or deformations of various sorts. While such properties as hardness, stiffness, and toughness are not always thought of in connection with the term "strength," they are unconsciously included when, in a specific instance, they are important. This may be illustrated by some comparisons of oak and longleaf pine. For floor beams or posts, the pine, because of its supporting power and stiffness as a beam, has a slight advantage over the oak and is considered "stronger." For handles, vehicles, or implement parts, oak, because of its greater toughness, or shock-resisting ability, is decidedly superior to the pine and is considered "stronger." Thus it is seen that tho term "strength" may refer to any one of many properties or combinations of properties, and is necessarily indefinite in meaning unless so modified as to indicate one particular thing. To say, then, that one species is stronger than another is a meaningless statement unless it is specified in what particular respect it excels. The term strength, in its more restricted sense, is the ability to resist stress of a single kind, or the stresses developed in one kind of a constructional member, as strength in shear, strength in compression, strength as a beam, strength as a column. Used in this way, the term is specific and allows no chance of confusion. Variability of The Strength of Wood. Wood nonhomogeneous. - Wood is exceedingly variable as compared with other structural materials. This variability is due to a number of factors, heretofore not well understood. For that reason any judgment of the strength of a piece was felt to be uncertain. The causes for variations in the properties of wood can now be given and their effects anticipated within reasonable limits. This should relieve the uncertainty. The inspector should understand in a general way the factors causing variations and their relation to the strength of the wood. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Health and Safety Code Handbook
Author: United States. Forest ServicePublisher:
ISBN:
Category : Accidents
Languages : en
Pages : 376
Book Description
Lumber and Veneer Consumer
Author: Publisher:
ISBN:
Category : Forest products industry
Languages : en
Pages : 488
Book Description
Timber Bridges
Author: Michael A. RitterPublisher:
ISBN: 9781410221919
Category : Technology & Engineering
Languages : en
Pages : 500
Book Description
Timber's strength, light weight, and energy-absorbing properties furnish features desirable for bridge construction. Timber is capable of supporting short-term overloads without adverse effects. Contrary to popular belief, large wood members provide good fire resistance qualities that meet or exceed those of other materials in severe fire exposures. From an economic standpoint, wood is competitive with other materials on a first-cost basis and shows advantages when life cycle costs are compared. Timber bridges can be constructed in virtually any weather conditions, without detriment to the material. Wood is not damaged by continuous freezing and thawing and resists harmful effects of de-icing agents, which cause deterioration in other bridge materials. Timber bridges do not require special equipment for installation and can normally be constructed without highly skilled labor. They also present a natural and aesthetically pleasing appearance, particularly in natural surroundings. The misconception that wood provides a short service life has plagued timber as a construction material. Although wood is susceptible to decay or insect attack under specific conditions, it is inherently a very durable material when protected from moisture. Many covered bridges built during the 19th century have lasted over 100 years because they were protected from direct exposure to the elements. In modem applications, it is seldom practical or economical to cover bridges; however, the use of wood preservatives has extended the life of wood used in exposed bridge applications. Using modem application techniques and preservative chemicals, wood can now be effectively protected from deterioration for periods of 50 years or longer. In addition, wood treated with preservatives requires little maintenance and no painting. Another misconception about wood as a bridge material is that its use is limited to minor structures of no appreciable size. This belief is probably based on the fact that trees for commercial timber are limited in size and are normally harvested before they reach maximum size. Although tree diameter limits the size of sawn lumber, the advent of glued-laminated timber (glulam) some 40 years ago provided designers with several compensating alternatives. Glulam, which is the most widely used modem timber bridge material, is manufactured by bonding sawn lumber laminations together with waterproof structural adhesives. Thus, glulam members are virtually unlimited in depth, width, and length and can be manufactured in a wide range of shapes. Glulam provides higher design strengths than sawn lumber and provides better utilization of the available timber resource by permitting the manufacture of large wood structural elements from smaller lumber sizes. Technological advances in laminating over the past four decades have further increased the suitability and performance of wood for modern highway bridge applications.
Aeronautical Engineering Index
Author: Government Research Directory
Author: Publisher:
ISBN:
Category : Executive departments
Languages : en
Pages : 1234
Book Description
A History of the Architecture of the USDA Forest Service
Author: John R. GrosvenorPublisher:
ISBN:
Category : Architecture
Languages : en
Pages : 312
Book Description