Wood Aircraft Inspection and Fabrication ...Subcommittee on Air Force-Navy-Civil Aircraft Design Criteria, Munitions Board Aircraft Committee, 1951 - 335 páginas |
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Términos y frases comunes
aircraft angle annual rings applied assembly periods bending blade casein glues clamps coat cold-setting color compreg compression wood Cross section magnified curvature curved decay dope Douglas-fir edge enamel face fibers Figure filler finish Forest Products Laboratory fuselage glue joints glue line gluing pressure hardwoods heartwood heat Hot-press inch kiln knot laminations lumber magnified 20 diameters maple material melamine method minutes mold nail normal wood percent moisture content phenol piece pine plies plywood pores pounds per square propeller radial relative humidity resin glues resorcinol ribs sapwood scarf joints sealer section magnified 20 shrinkage Sitka spruce slope of grain spar flanges specific gravity spiral grain springwood stain streaks strips summerwood surface sweetgum tangential temperature tests thickness thin tion ture urea resins usually veneer weight western hemlock western redcedar Western white pine width wing yellow birch yellow-poplar
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Página 320 - Factory and shop lumber. Lumber intended to be cut up for use in further manufacture. It is graded on the basis of the percentage of the area which will produce a limited number of cuttings of a specified, or of a given minimum, size and quality.
Página 320 - Heartwood. — The wood extending from the pith to the sapwood, the cells of which no longer participate in the life processes of the tree. Heartwood may be infiltrated with gums, resins, and other materials that usually make it darker and more decay resistant than sapwood.
Página 320 - Weight of the water contained in the wood usually expressed in percentage of the weight of the oven-dry wood. Moisture gradient. A condition of graduated moisture content between the successive layers of a material, such as wood, due to the losing or absorbing of moisture.
Página 319 - Durability. A general term for permanence or lastingness. Frequently used to refer to the degree of resistance of a species or of an individual piece of wood to attack by wood-destroying fungi under conditions that favor such attack. In this connection the term " resistance to decay
Página 320 - Dimension. All yard lumber except boards, strips, and timbers; that is, yard lumber 2 Inches and less than 5 inches thick, and of any width. Strips. Yard lumber less than 2 inches thick and less than 8 inches wide.
Página 321 - Spring wood. The portion of the annual growth ring that is formed during the early part of the season's growth. It is usually less dense and weaker mechanically than summer wood.
Página 321 - TWIST. A distortion caused by the turning or winding of the edges of a board so that the four corners of any face are no longer in the same plane.
Página 319 - Extractives. — Substances in wood, not an integral part of the cellular structure, that can be removed by solution in hot or cold water, ether, benzene, or other solvents that do not react chemically with wood components.
Página 318 - Bird's-eye: A small central spot with the wood fibers arranged around it in the form of an ellipse so as to give the appearance of an eye.
Página 320 - Plywood. A piece of wood made of three or more layers of veneer joined with glue, and usually laid with the grain of adjoining plies at right angles. Almost always an odd number of plies are used to provide balanced construction.