ASTM D3500-2014 Standard Test Methods for Structural Panels in Tension《胶合板抗拉结构的标准试验方法》.pdf
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1、Designation: D3500 90 (Reapproved 2009)D3500 14Standard Test Methods forStructural Panels in Tension1This standard is issued under the fixed designation D3500; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisi
2、on. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope1.1 These test methods cover the determination
3、of the tensile properties of structural panels.1.2 Structural panels in use include plywood, waferboard, oriented strand board and composites of veneer, and otherwood-based layers1.3 Test Method A, Tensile Test for Small Specimens:1.3.1 This test method employs small specimens that should have a red
4、uced cross section at the center of their length to avoidfailure in the grip area. The transition from full width of specimen to reduced section at the center should be gradual to minimizestress concentration.1.3.2 When the measurements of elastic properties are to be made, the length of the reduced
5、 cross section at the center shouldbe of sufficient length to accommodate an extensometer.1.4 Test Method B, Tensile Test for Large Specimens:1.4.1 This test method employs large specimens and responds well to manufacturing variables, plywood growthpanel gradecharacteristics, and other defectsvariab
6、les influencing the tensile properties of structural panels.1.4.2 The test specimens are large enough to contain the maximum sized defects grade characteristics found in plywood panels.The test specimens have a constant cross section since the size and location of defects grade characteristics contr
7、ol the locationof failures and the effect of stress concentration at the grips is overshadowed.1.4.3 This test method is recommended for the following:1.4.3.1 Comparative tests of structural panels,1.4.3.2 Determining the influence of any specific strength reducing defectsvariables on the tensile pr
8、operties of structural panels,1.4.3.3 Determination of tensile properties of plywood and composites containing veneer with growth and manufacturingcharacteristics.panels for use in developing structural recommendations.1.5 The values stated in inch-pound units are to be regarded as standard. The val
9、ues given in parentheses are mathematicalconversions to SI units that are provided for information only and are not considered standard.1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to e
10、stablish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D2395 Test Methods for Density and Specific Gravity (Relative Density) of Wood and Wood-Based MaterialsD4442 Test Methods for Direct Moist
11、ure Content Measurement of Wood and Wood-Base Materials3. Significance and Use3.1 These test methods determine the tensile properties of structural panels in response to stresses acting in the plane of thepanel.1 These test methods are under the jurisdiction of ASTM Committee D07 on Wood and are the
12、 direct responsibility of Subcommittee D07.03 on Panel Products.Current edition approved May 1, 2009Oct. 1, 2014. Published June 2009November 2014. Originally approved in 1976. Last previous edition approved in 20032009 asD3500 90 (2003).(2009). DOI: 10.1520/D3500-90R09.10.1520/D3500-14.2 For refere
13、ncedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the
14、 user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standar
15、d as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.2 Test Method AThis test method is suited to material that is uniform with respect to tensile properties. It is normall
16、y appliedto structural panels and plywood of clear, straight-grained veneers. It may also be used to evaluate the strength of scarf and fingerjoints and other manufacturing process variables that can be expected to influence the tensile properties of structural panels in auniform manner across the w
17、idth of the sheet.3.3 Test Method BThis test method employs large test specimens and responds well to all manufacturing variables and growthcharacteristics that affect the tensile properties of structural panels.3.4 It is recommended that where comparisons are to be made that the same test method an
18、d specimen size be used throughout.This is because the volume of material included in a test specimen can influence the tensile strength regardless of whether thematerial properties are uniform throughout the sheet or vary widely due to the presence of growth or manufacturing features.4. Control of
19、Moisture Content4.1 Structural panel specimens to be tested at specific moisture contents or after reaching equilibrium moisture content atspecific temperature and relative humidity conditions shall be conditioned to approximate constant weight in controlledatmospheric conditions. For approximating
20、moisture conditions of structural panels used under dry conditions, a relative humidityof 65 6 2 % at a temperature of (68 6 6F) (20 6 3C) is recommended.5. Variables Influencing Tensile Properties of Structural Panels5.1 Moisture ContentMoisture content shall be determined in accordance with Test M
21、ethod D4442.5.2 Specific GravityDetermine specific gravity in accordance with Test Methods D2395. The specimen may be the same asthat for moisture content determination but must have volume of at least 1 in.3 (16 cm3) if from small specimens (Test MethodA), and at least 3 in.3 (49 cm3) if from large
22、 specimens (Test Method B). Specimens containing veneer shall be free of visible knotsor voids in any ply.TEST METHOD ATENSILE PROPERTIESOF SMALL SPECIMENS6. Test Specimens6.1 Specimens may be of Types A, B, or C in Fig. 1.6.1.1 When the evaluation of elastic properties as well as ultimate tensile s
23、trength is required, the size and shape of the testspecimen shall be selected on the basis of the construction and thickness of the material. For other structural panels, and plywoodor composites with the grain of the individual veneer plies or laminations making grain angles of individual veneer la
24、mina of 0or 90, TypeAshall be used for material over 14 in. (6 mm) in thickness and Type B for material 14 in. (6 mm) or less in thickness.For plywood with an angle other than 0 or 90 between the length of the specimens and the grain orientation, Type C shall be usedregardless of the thickness of th
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