1、Designation:D909Standard Terminology Relating toWood and Wood-Based Products1This standard is issued under the fixed designation D 9; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the year of last revision. A number in parenthese
2、s indicates the year of last reapproval. A superscriptepsilon () indicates an editorial change since the last revision or reapproval.INTRODUCTIONThe definitions contained herein constitute a lexicon of terms of general interest. Definitions in morespecialized wood product or process use will be foun
3、d in other standards. These include PracticeD 245, Terminology D 907, Terminology D 1038, Nomenclature D 1165, Terminology D 1554,Terminology F 547, Practice D 2555, and Terminology C 274.1. Scope1.1 This terminology covers a repository of definitionsessential for the business of Committee D07.1.2 T
4、he following criteria shall be followed by Subcommit-tee D07.91 in selecting terms and associated definitions forinclusion in this terminology.1.2.1 Terms and associated definitions shall be selected ifthey are in general use in the conduct of the standards overwhich D07 has jurisdiction.1.2.2 Terms
5、 and associated definitions in general industrialor technical use that are not unique to wood or wood-basedproducts are not included.1.2.3 Terms and associated definitions that are unique to asingle D07 standard and defined therein or generally under-stood or adequately defined in other readily avai
6、lable sourcesmay not be included in this terminology.1.3 When a term is used in an ASTM document for whichCommittee D07 is responsible, it is included in this terminol-ogy only when judged an essential term by SubcommitteeD07.91.1.4 A definition is a single sentence with additional infor-mation incl
7、uded in discussion notes.1.5 Terms and definitions shall be reviewed every 5 years;the year of last review is appended.2. Referenced Documents2.1 ASTM Standards:2C 274 Terminology of Structural Sandwich ConstructionsD 143 Test Methods for Small Clear Specimens of TimberD 245 Practice for Establishin
8、g Structural Grades and Re-lated Allowable Properties for Visually Graded LumberD 907 Terminology of AdhesivesD 1038 Terminology Relating to Veneer and PlywoodD 1165 Nomenclature of Commercial Hardwoods and Soft-woodsD 1554 Terminology Relating to Wood-Base Fiber andParticle Panel MaterialsD 2016 Te
9、st for Moisture Content of Wood3D 2555 Practice for Establishing Clear Wood Strength Val-uesF 547 Terminology of Nails for Use with Wood and Wood-Base Materials3. Terminologyallowable propertiesmechanical properties of materials asprepared for design use. Allowable properties of wood areidentified w
10、ith stress-grade descriptions and reflect theorthotropic structure of wood. Often considered synonymouswith allowable unit stresses, working stresses, and designstresses.American Softwood Lumber Standarda voluntary productstandard of the U.S. Department of Commerce which servesas a basis for the pre
11、paration and revision of industry-sponsored grading rules for lumber.American standard lumberlumber conforming to the basicprovisions of the American Softwood Lumber Standard.annual ringthe growth layer produced by the tree in a singlegrowth year, including earlywood and latewood.bark pocketthe laye
12、r of a tree outside the cambium com-prising the inner bark and the outer bark.bark productan opening between annual growth rings thatcontains bark. Bark pockets appear as dark streaks on radialsurfaces and as rounded areas on tangential surfaces.1This terminology is under the jurisdiction of ASTM Co
13、mmittee D07 on Woodand is the direct responsibility of Subcommittee D07.91 on Terminology andEditorial.Current edition approved May 1, 2009. Published June 2009. Originallyapproved in 1907. Last previous edition approved in 2005 as D905.2For referenced ASTM standards, visit the ASTM website, www.ast
14、m.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Withdrawn. The last approved version of this historical standard is referencedon www.astm.org.1Copyright ASTM International
15、, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.inner barkthe layer of living bark (phloem) that separatesthe outer bark from the cambium and which in the living treegenerally is moist and soft.outer barkthe layer of dead bark outside the inner bark,forming the
16、exterior surface of the tree stem. The outer barkfrequently is corky and dry.basic stress (archaic)the term once used for an allowableproperty for clear, straight-grained lumber.battena narrow strip of lumber for covering the adjoiningedges of roofing or siding, often designated as “batts.”board foo
17、ta unit of measurement represented by a board 1ft long, 1 ft wide, and 1 in. thick (abbreviation: ft. b.m.,bd. ft., fmb). In finished or surfaced lumber, the board-footmeasure is based on the nominal size. In practice, theworking unit is 1000 board feet (abbreviation: M bd. ft.,M B.M., M B.F).board
18、measurea unit of measurement of the volume inboard feet of logs or lumber (abbreviation: B.M.).boardssee lumber.bolethe stem or trunk of a tree of size sufficient to yieldlumber, veneer, or poles.bolt(1) a short section of a tree trunk or limb;(2) a short log of a length suitable for peeling in a la
19、the forveneer; and(3) a short portion of a log prepared for production ofshingles, staves, etc.bowthe distortion of a piece of lumber in which there is adeviation in a direction perpendicular to the flat face from astraight line from end to end of the piece.brashnessa condition that causes some piec
20、es of wood to berelatively low in shock resistance for the species and, whenbroken in bending, to fail abruptly without splintering atcomparatively small deflections.built-up timbersan assembly made by joining layers oflumber together with mechanical fastenings so the grain ofall laminations is esse
21、ntially parallel.burl(1) a hard, woody outgrowth on a tree, more or lessrounded in form, usually resulting from the entwined growthof a cluster of adventitious buds; and(2) in wood or veneer, a localized severe distortion of thegrain generally rounded in outline, usually resulting fromovergrowth of
22、dead branch stubs, varying from12 in. toseveral inches in diameter; frequently includes one or moreclusters of several small contiguous conical protuberances,each usually having a core of pith but no appreciable amountof end grain (in tangential view) surrounding it.cambiumthe layer of cells that li
23、es between the inner barkand the wood of a tree, that repeatedly subdivides to formnew wood and bark cells.canta log that has been slabbed on one or more sides,usually with the intention of resawing at right angles to thewidest sawn face.casehardeninga condition of stress and set in wood due todryin
24、g in which outer fibers are under compressive stress andinner fibers under tensile stress, a condition that often existsduring subsequent processing. In commerce, the term oftenconnotes a degree of severity regarded as detrimental in use.cella general term for the minute units of wood structurehavin
25、g distinct cell walls and cell cavities including woodfibers, vessel segments, and other elements of diversestructure and function.cellulosethe carbohydrate that is the principal constituent ofwood and forms the structural framework of the wood cells.characteristica distinguishing feature or trait.
26、In gradinglumber and other wood products, a feature in or on the woodwhich by its nature, extent, and frequency of occurrencedetermines the grade or level of quality.characteristic sizethe standard dimensions of the piece atwhich the characteristic value is calculated.characteristic valuethe structu
27、ral property estimate, typi-cally a population mean, median, or tolerance limit valueestimated from the test data that is representative of thepopulation being sampled. Test data is typically adjusted tostandardized conditions of temperature, moisture content,and characteristic size.checka separatio
28、n of the wood along the fiber direction thatusually extends across the rings of annual growth, com-monly resulting from stresses set up in wood during season-ing.end checka seasoning check occurring on the end of aboard or other piece of wood.heart checka check that extends across the growth layersi
29、n one or more directions from the pith toward, but not to, thesurface of a piece of wood; a synonym is pith check.pith checksee heart check.roller checka crack in the wood structure caused by apiece of cupped lumber being flattened between machinerollers.star checka heart check in which the separati
30、on extends inmore than one direction from the pith.surface checka check occurring on the surface of a pieceof wood, usually on the tangential face not extendingthrough the piece.through checka check that extends through a piece ofwood, or from a surface to the opposite or to an adjoiningsurface.chip
31、ssmall fragments of wood chopped or broken by cutssuch as by a planer, chipper, mechanical hog, hammermill.clearfree of defects or imperfections.coarse grainsee grain.collapsethe flattening of single cells or rows of cells duringthe drying or pressure treatment of wood, characterized by acaved-in or
32、 corrugated posite wood beama laminar construction comprising acombination of wood and other simple or complex materialsassembled and intimately fixed in relation to each other so asto use the properties of each to attain specific structuraladvantage of the whole pression failuredeformation of the w
33、ood fibers result-ing from excessive compression along the grain either indirect end compression or in bending. It may develop instanding trees due to bending by wind or snow or to internallongitudinal stresses developed in growth, or it may resultfrom stresses imposed after the tree is cut. In surf
34、acedD9092lumber, compression failures appear as fine wrinkles acrossthe face of the pression parallel to graincompression, endwise (par-allel to the grain). The imposition of a compressive stressthat acts in a direction parallel to the grain of the wood, as ina pression perpendicular to graincompres
35、sion, sidewise(perpendicular to the grain). The imposition of a compres-sive stress that acts in a direction approximately perpendicu-lar to the grain of the pression woodabnormal wood formed typically on thelower side of branches and inclined trunks of softwood trees.Compression wood is identified
36、by its relatively wide annualrings, usually eccentric, relatively large amount of latewood,sometimes more than 50 % of the width of the annual ringsin which it occurs, and its lack of demarcation betweenearlywood and latewood in the same annual rings. Compres-sion wood shrinks excessively lengthwise
37、, as compared withnormal wood.conifera tree belonging to the order Coniferae, usuallyevergreen, with cones and needle-shaped or scalelike leaves,and producing wood known commercially as “softwood.”crooka distortion of a piece of lumber in which there is adeviation in a direction perpendicular to the
38、 edge from astraight line from end to end of the piece.cross breaka separation of the wood cells across the grain.Such breaks may be due to internal stress resulting fromunequal longitudinal shrinkage or external forces.cross grainsee grain.cross sectiona section of a stem, board, or other piece ofw
39、ood taken at right angles to its longitudinal axis.crosscutto cut a board, timber, or log generally transverse tothe direction of the fibers; a synonym is “buck”.cupa distortion of a board in which there is a deviationflatwise from a straight line across the width of the board.decaydecomposition of
40、wood substance caused by action ofwood-destroying fungi, resulting in softening, loss ofstrength and weight, and often in change of texture and color.advanced (or typical) decaythe older stage of decay inwhich the destruction is readily recognized because thewood has become punky, soft and spongy, s
41、tringy, ring-shaked, pitted, or crumbly. Decided discoloration or bleach-ing of the rotted wood is often apparent.incipient decaythe early stage of decay that has notproceeded far enough to soften or otherwise perceptiblyimpair the hardness of the wood. It may be accompanied bya slight discoloration
42、 or bleaching of the wood.pocket rotadvanced decay that appears in the form of ahole, pocket, or area of soft rot usually surrounded byapparently sound wood.defectany irregularity or imperfection in a tree, log, piece,product, or lumber that reduces the volume of sound wood orlowers its durability,
43、strength, or utility value.degrade, na reduction in quality of lumber, logs, or otherwood products due to processing.dense(1) term used in stress grading of certain softwoodspecies to signify a high specific gravity; and(2) a visual estimate of high specific gravity. To be classifiedas dense, the so
44、ftwood species shall average on one end orthe other of each piece, not less than six annual rings perinch and one-third or more latewood. Pieces not less thanfour rings per inch shall be accepted as dense if they averageone-half or more latewood.depth factorthe factor included in deriving the allowa
45、blebending stress for rectangular members which takes intoaccount the somewhat lower unit strength developed inlarger members as compared to smaller members; archaicterminology more correctly termed size factor.depth of beamthat dimension of the beam that is perpen-dicular to the span and parallel t
46、o the direction in which theload is applied.diffuse porous woodcertain hardwoods in which the poresexhibit little or no variation in size or distribution throughoutthe growth ring, only decreasing slightly in size, graduallytoward the outer border of the ring.dimensional stabilizationtreatment of wo
47、od to reduceswelling and shrinking caused by changes in its moisturecontent.dotesee decay.dressed sizesee lumber.dryingsee seasoning.dry-bulb temperaturetemperature of the air as indicated byan accurate thermometer, corrected for radiation if signifi-cant.durabilitya general term for permanence or r
48、esistance todeterioration. Frequently used to refer to the degree ofresistance of a species of wood to attack by wood-destroyingfungi under conditions that favor such attack. In this con-nection, the term “decay resistance” is more specific.duration of loadthe duration of stress or the time duringwh
49、ich a load acts on a member. In wood, a design consid-eration for modifying allowable stresses, based on theaccumulated loadings anticipated in the life of a structure.E-rated lumberlumber graded for use in manufacturingglued-laminated timber by nondestructive measurement of amodulus of elasticity (E), and by visual inspection inaccordance with the grading rules of the applicable gradingor inspection agency.earlywoodthe less dense, large-celled, part of the growth
