BS DD CEN TS 14966-2005 Wood-based panels - Small scale indicative test methods for certain mechanical properties《木质板材 特定机械特性的小型指示性试验方法》.pdf

1、DRAFT FOR DEVELOPMENT DD CEN/TS 14966:2005 Wood-based panels Small scale indicative test methods for certain mechanical properties ICS 79.060.01 DD CEN/TS 14966:2005 This Draft for Development was published under the authority of the Standards Policy and Strategy Committee on 13 October 2005 BSI 13

2、October 2005 ISBN 0 580 46271 4 National foreword This Draft for Development is the official English language version of CEN/TS 14966:2005. This publication is not to be regarded as a British Standard. It is being issued in the Draft for Development series of publications and is of a provisional nat

3、ure because at the time of publication experience of the procedures for the specified small-scale indicative test methods, as tools for the estimation of certain mechanical properties, may not be widespread in the different European countries. It should be applied on this provisional basis, so that

4、information and experience of its practical application may be obtained. Comments arising from the use of this Draft for Development are requested so that UK experience can be reported to the European organization responsible for its conversion to a European standard. A review of this publication wi

5、ll be initiated 2 years after its publication by the European organization so that a decision can be taken on its status at the end of its 3-year life. Notification of the start of the review period will be made in an announcement in the appropriate issue of Update Standards. According to the replie

6、s received by the end of the review period, the responsible BSI Committee will decide whether to support the conversion into a European Standard, to extend the life of the Technical Specification or to withdraw it. Comments should be sent in writing to the Secretary of BSI Technical Committee B/541,

7、 Wood-based panels, at British Standards House, 389 Chiswick High Road, London W4 4AL, giving the document reference and clause number and proposing, where possible, an appropriate revision of the text. A list of organizations represented on this committee can be obtained on request to its secretary

8、. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue

9、or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Summary of pages This document comprises a front cover, an inside front cover, the CEN/TS title page, pages 2 to 14, an inside b

10、ack cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsTECHNICALSPECIFICATION SPCIFICATIONTECHNIQUE TECHNISCHESPEZIFIKATION CEN/TS14966 May2005 ICS79.060.01 Englishversion

11、WoodbasedpanelsSmallscaleindicativetestmethodsfor certainmechanicalproperties PanneauxbasedeboisMthodesdessaisindicatives surprouvettesdepetitesdimensionspourcertaines propritsmcaniques HolzwerkstoffeOrientierendePrfverfahrenankleinen PrfkrpernfreinigemechanischeEigenschaften ThisTechnicalSpecificat

12、ion(CEN/TS)wasapprovedbyCENon25October2004forprovisionalapplication. TheperiodofvalidityofthisCEN/TSislimitedinitiallytothreeyears.AftertwoyearsthemembersofCENwillberequested tosubmittheir comments,particularlyonthequestionwhethertheCEN/TScanbeconvertedintoaEuropeanStandard. CENmembersarerequiredtoa

13、nnouncetheexistenceofthisCEN/TSinthesamewayasforanENandtomaketheCEN/TSavailable promptlyatnationallevelinanappropriateform.Itispermissibletokeepconflictingnationalstandardsinforce(inparall eltotheCEN/TS) untilthefinaldecisionaboutthepossibleconversionoftheCEN/TSintoanENisreached. CENmembersarethenat

14、ionalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATI

15、ON COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2005CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.CEN/TS14966:2005:EDD CEN/TS 14966:2005 2 Contents Page Foreword 3 1 Scope .4 2 Normative refe

16、rences .4 3 Terms and definitions.4 4 Indicative planar shear strength 4 4.1 Principle.4 4.2 Apparatus 5 4.3 Test pieces 5 4.4 Procedure 6 4.5 Expression of results6 5 Indicative panel shear strength .6 5.1 Principle.6 5.2 Apparatus 7 5.3 Test pieces 7 5.4 Procedure 8 5.5 Expression of results9 6 In

17、dicative modulus of elasticity in tension and tension strength .9 6.1 Principle.9 6.2 Apparatus 9 6.3 Test pieces 9 6.4 Procedure 10 6.5 Expression of results11 7 Indicative compression strength .11 7.1 Principle.11 7.2 Apparatus 11 7.3 Test pieces 12 7.4 Procedure 12 7.5 Expression of results12 8 T

18、est report .13 Bibliography.14 DD CEN/TS 14966:2005 3 Foreword This document (CEN/TS 14966:2005) has been prepared by Technical Committee CEN/TC 112 “Wood-based panels”, the secretariat of which is held by DIN. Attention is drawn to the possibility that some of the elements of this document may be t

19、he subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to announce this Technical Specification: Austria,

20、 Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. 4 1 Scope This Technical Specifi

21、cation specifies small-scale test methods for estimating the following mechanical properties of wood-based panels: indicative planar shear strength (sometimes referred to as block shear); indicative panel shear strength; indicative strength and modulus of elasticity in tension in the plane of the pa

22、nel; indicative strength in compression in the plane of the panel. Reference should be made to EN 310 for bending properties. For plywood, EN 314-1 may also be used as an indicator of planar shear strength. These test methods are intended for indicative purposes only and should not be used as a mean

23、s of determining structural design values. They may not be suitable for all panel types. They may be used as a means of supporting quality control procedures for structural panels, if correlations with EN 789 test results can be established (CEN Technical Report in preparation). 2 Normative referenc

24、es The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 325, Wood-based panels Determination of dim

25、ensions of test pieces. EN 326-1, Wood-based panels Sampling, cutting and inspection Part 1: Sampling and cutting of test pieces and expression of test results. 3 Terms and definitions For the purposes of this document, the following terms and definition apply. 3.1 indicative test test intended to g

26、ive an estimate of a particular property for guidance purposes only. It may be used as a tool for the estimation of additional properties where a reliable correlation can be demonstrated 4 Indicative planar shear strength 4.1 Principle The shear strength parallel to the surface of the test piece is

27、determined by applying a uniform compressive force until rupture occurs. The compression load required to obtain failure is measured. NOTE This test procedure is not appropriate to plywood made from mixed species. DD CEN/TS 14966:20055 4.2 Apparatus 4.2.1 Measuring instruments, as specified in EN 32

28、5. 4.2.2 Shear test apparatus for applying a shear load through the central plane of the test piece, as shown in Figure 1. The shearing apparatus provides support to one half of the lower edge of the test pieces, whilst applying a load to the opposite half of the upper edge of the test piece. The ed

29、ges of the support and loading blocks shall form a vertical plane passing through the centre of the test piece. 4.2.3 Testing machine, capable of applying a compressive force parallel to the surface of the test piece, and measuring this force to an accuracy of 1 % of the maximum applied load. Key 1

30、spherical seated 2 test pieceFigure 1 Arrangement of the shear test apparatus 4.3 Test pieces 4.3.1 Sampling and cutting Sampling and cutting of the test pieces shall be carried out according to EN 326-1. A minimum of 8 test pieces shall be taken from each board to be tested. 4.3.2 Dimensions The te

31、st piece shall be (50 0,1) mm (50 0,1) mm with a thickness equal to the thickness of the board. If the thickness of the panel is 15 mm, the thickness of the test piece shall be a single panel thickness. For panels with a thickness 15 mm, a sufficient odd number of specimens shall be laminated by glu

32、ing, with a suitable glue type, to give a test piece with a minimum thickness of 15 mm. DD CEN/TS 14966:20056 4.3.3 Conditioning The test pieces shall be conditioned to constant mass in an atmosphere with a relative humidity of (65 5) % and a temperature of (20 1) C. Constant mass is considered to b

33、e reached when the results of two successive weighing operations, carried out at an interval of 24 h, do not differ more than 0,1 % of the mass of the test piece. In some cases, for instance in a cyclic test in humid conditions or in an immersion-in-water or boil test, alternative conditioning proce

34、dures may be specified. In this case the appropriate standard shall be consulted and followed. In the case of laminated test pieces, the lamination shall be carried out after the cyclic conditioning. 4.3.4 Determination of dimensions After conditioning, measure the length and width of each test piec

35、e to an accuracy of 0,1 mm according to EN 325. 4.4 Procedure The shear test apparatus shall be mounted in a compression testing machine. The test piece shall be centrally positioned in the apparatus. The load shall be applied at a constant rate of cross-head movement throughout the test. The rate o

36、f loading shall be adjusted so that the maximum load is reached within (60 30) s. The maximum load for each test piece shall be recorded. 4.5 Expression of results The shear strength parallel to the surface (indicative planar shear strength) f v(N/mm 2 ) of the test piece shall be calculated from th

37、e following equation to three significant figures: A F f v max = where F max is the maximum load, in Newtons; A is the shear area of the test piece (length width) in square millimetres. 5 Indicative panel shear strength 5.1 Principle The panel shear strength perpendicular to the plane of the test pi

38、ece is determined by applying a uniform compressive force to a notched test piece until failure occurs. The load required to cause failure is recorded. DD CEN/TS 14966:20057 5.2 Apparatus 5.2.1 Measuring instruments, as specified in EN 325. 5.2.2 Shear test apparatus for applying a shear load perpen

39、dicular to the plane of the test piece, as shown in Figure 2. The apparatus provides support to the two ends of the test piece, outside of the two pairs of notches, whilst applying a load to the upper surface between the two pairs of notches. Dimensions in millimetres Figure 2 Arrangement of the she

40、ar test apparatus 5.2.3 Testing machine, capable of applying a compressive force perpendicular to the plane of the test piece, with two parallel steel platens and measuring the applied load to an accuracy of 1 % of the maximum load. One of the steel platens shall be attached to a ball joint. 5.3 Tes

41、t pieces 5.3.1 Sampling and cutting Sampling and cutting of the test pieces shall be carried out according to EN 326-1. A minimum of 8 test pieces for both transverse and longitudinal directions shall be taken from each board. (Test pieces shall normally be cut parallel and perpendicular to the long

42、 direction of the board but may be cut at other angles if required.) DD CEN/TS 14966:20058 5.3.2 Dimensions The test piece shall have a length of (150 1) mm and a width of (50 1) mm with a thickness equal to the thickness of the board. For panels with a thickness 15 mm sufficient specimens shall be

43、laminated by gluing, with a suitable glue type, to give a test piece with a minimum thickness of 15 mm. The test piece has on two longitudinal edges two notches of (10 0,5) mm deep and (2 0,5) mm wide at a distance of (50 0,5) mm from the ends, as shown in Figure 3. Dimensions in millimetres Figure

44、3 Shape and dimensions of the test piece 5.3.3 Conditioning The test pieces shall be conditioned to constant mass in an atmosphere with a relative humidity of (65 5) % and a temperature of (20 1) C. Constant mass is considered to be reached when the results of two successive weighing operations, car

45、ried out at an interval of 24 h, do not differ by more than 0,1 % of the mass of the test piece. In some cases, for instance in a cyclic test in humid conditions or in an immersion-in-water or boil test, alternative conditioning procedures may be specified. In this case the appropriate standard shal

46、l be consulted and followed. In the case of laminated test pieces, the lamination shall be carried out after the cyclic conditioning. 5.3.4 Determination of dimensions After conditioning, measure the width and thickness of the two central shear areas of each test piece, as shown in Figure 3, to an a

47、ccuracy of 0,1 mm according to EN 325. 5.4 Procedure The shear test apparatus shall be mounted in a compression testing machine. The test piece shall be positioned centrally in the apparatus, with the surfaces parallel to the direction of the applied load. The load shall be applied at a constant rat

48、e of cross-head movement throughout the test. The rate of loading shall be adjusted so that the maximum load is reached within (60 30) s. The maximum load for each test piece shall be recorded. DD CEN/TS 14966:20059 5.5 Expression of results The shear strength perpendicular to the plane of the board (panel shear strength) f p(N/mm 2 ) of the test piece shall be calculated from the following equation to three significant figures: A F f 2 max p = where F maxis the maximum load, in Newtons; A