ISO 4859-1982 Wood Determination of radial and tangential swelling《木材 径向和强向膨胀的测定》.pdf

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1、International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONWE)KP(YHAPOLIHAR OPrAHM3AUHR no CTAHAPTM3ALWlRGANISATION INTERNATIONALE DE NORMALISATION Wood - Determination of radial and tangential swelling Bois - Determination du gon flemen t radial et tangen tiel First edition - 1982-12-01 U

2、DC 674.03 : 193.23 : 539.388.8 Descriptors : wood, tests, determination, swelling, specimen preparation. Ref n No. ISO 4859-1982 (E) Price based on 2 pages Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permi

3、tted without license from IHS-,-,-Foreword ISO (the International Organization for Standardization) is a worldwide federation of national Standards institutes (ISO member bodies). The work of developing Inter- national Standards is carried out through ISO technical committees. Every member body inte

4、rested in a subject for which a technical committee has been set up has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees ar

5、e circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. International Standard ISO 4859 was developed by Technical Committee ISO/TC 55, Sawn timber and sawlsgs, and was circulated to the member bodies in April 1980. lt has been approved b

6、y the member bodies of the following countries: Australia Ghana Poland Austria Hungary Romania Belgium India South Africa, Rep. of Brazil Italy Spain Bu Igaria Korea, Dem. P. Rep. of Sweden Czechoslovakia Korea, Rep. of Turkey Egypt, Arab Rep. of New Zealand USSR Finland Norway Y ugoslavia The membe

7、r bodies of on technical grounds : 0 the following cou ntries expressed d isapproval of the document Canada France I reland Netherlands International Organkation for Standardkation, 1982 Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license wit

8、h ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-INTERNATIONAL STANDARD ISO 4859-1982 (E) Wood - Determination of radial and tangential swelling 1 Scope and field of application This International Standard specifies a method for the deter- mination of linear sw

9、elling, in the radial and tangential direc- tions, of wood. 5 Preparation of test pieces 5.1 Test pieces shall be made in the form of rectangular prisms, of base 20 mm x 20 mm, and of length along the grain from IO to 30 mm. The angle of inclination of annual rings to a pair of opposite faces of the

10、 test piece shall not exceed IOO. 2 References 5.2 The preparation and number of test pieces shall be in ac- cordante with ISO 3129. ISO 3i29, Wood - Sampling methods and general re- guirements for physical and mechanical tests. ISO 3130, Wood - Determination of moisture content for ph ysical and me

11、chanical tes ts. 6 Procedurel) 3 Principle Determination of the linear dimensions, in the radial and tangential directions, of test pieces after drying, at a moisture content in equilibrium with the normal environment and at a moisture content equal to or greater than the Saturation Point of the cel

12、lular Walls of wood. 6.1 Dry the test pieces to constant dimensions in the oven (4.2) at a temperature of 103 temperature 20 + 2 OC) so that no Checks distor- ting their dimensions and shape occur. Check the changes in dimensions of two or three control test pieces by repeated measurements, as speci

13、fied in 6.3, every 6 h after stabilization of the conditioning environment. Stop the conditioning when the differente between two successive measurements does not exceed 0,02 mm. The conditioning of test pieces may be stopped by using the method of successive weighing in accor- dance with ISO 3130.

14、1) If necessary, swelling may also be determined at relative humidities between 30 and $30 %. 1 Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO 4959-1982 (EI 7.2 Calc

15、ulate the linear swelling, a, when the moisture con- tent changes to equilibrium with the normal environment (relative humidity 65 + 5 %; temperature 20 rt 2 OC), as a percentage, by the formulae 6.5 Test pieces in which period shall be disregarded. Checks occurred the test 66 . Measure the every te

16、st piece, as Cross-sectional specified in 6.3. dimensions #, !r and lt, of for the radial direction : 6.7 Submerge the test pieces in distilled water in the vessel (4.3) and soak at a temperature of 20 7 Expression of results 7.1 Calculate the total linear swelling, amax, as a by the formulae percen

17、tage, z r min and 4 min have the same meaning as in 7.1. Express the results to the nearest 0,l %. a) for the radial direction : 8 Test report I r max - 4 min a r max = x 100 I r min b) for the tangential direction : The test report shall include the following particulars : a) reference to this Inte

18、rnational Standard b) information required by ISO 3129 (subclause 6.4); I t max - 4 min at max = x 100 1 t min c) type and volume of material tested (stand and number of selected trees; lot of sawn timber and number of selected boards, etc. ); where d) dimensions of the test piece and the direction

19、of the grain; l r min and 4 min are the dimensions of the test piece, in millimetres, after drying, measured in the radial and tangen- tial directions, respectively; e) number of test pieces tested; f) the test results, calculated as specified in clause 7, and their statistical values (together with

20、 the relative humidity and temperature if swelling was determined under condi- tions different from those specified in 6.4); _ 1 r max and 4 max are the dimensions of the test piece, in millimetres, at a moisture content greater the Saturation Point of the cellular Walls of wood, measured in the rad

21、ial and tangential directions, respectively. g) date of testing; h) place of testing. Express the results to the nearest 0,l %. Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-