ISO 17754-2014 Timber structures - Test methods - Torsional resistance of driving in screws《木结构 试验方法 钉入螺丝的抗扭强度》.pdf

1、 ISO 2014 Timber structures Test methods Torsional resistance of driving in screws Structures en bois Mthodes dessai Rsistance la torsion des vis lors du vissage INTERNATIONAL STANDARD ISO 17754 First edition 2014-05-01 Reference number ISO 17754:2014(E) ISO 17754:2014(E)ii ISO 2014 All rights reser

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4、O 17754:2014(E) ISO 2014 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 1 4 Symbols 1 5 Material requirements . 1 5.1 Description . 1 6 Test methods . 2 6.1 General . 2 6.2 Conditioning 2 6.3 Sampling . 2 6.4 Test piece dimensions .

5、2 7 Test 3 7.1 Test setup . 3 7.2 Procedure 3 7.3 Results 4 8 Test report . 4 8.1 Test piece . 4 8.2 Test method . 5 8.3 Test results 5 Bibliography 6 ISO 17754:2014(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO membe

6、r bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmenta

7、l and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance a

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11、essment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information The committee responsible for this document is ISO/TC 165, Structural Timber.iv ISO 2014 All rights reserved INTERNATIONAL S

12、T ANDARD ISO 17754:2014(E) Timber structures Test methods Torsional resistance of driving in screws 1 Scope This International Standard specifies a test method to determine the torsional resistance to driving of screws in solid timber or glued laminated timber or other wood-based materials. The meth

13、od is used primarily to ensure the torque that may be applied to install screws will be less than the specified failure torque of the screw. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For

14、 dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3130, Wood Determination of moisture content for physical and mechanical tests ISO 3131, Wood Determination of density for physical and mec

15、hanical tests 3 T erms a nd definiti ons For the purposes of this document, the following terms and definitions apply 3.1 moment cell device that records the torque applied 3.2 test piece element or part of an element that will include the driven screw after the test made of solid timber, glued lami

16、nated timber or wood-based materials, or combinations of these materials 4 Symbols R tor,max maximum screw insertion moment, in Newton millimetre d screw nominal diameter, in millimetre l total length of the screw, in millimetre 5 Material requirements 5.1 Description The screws and solid timber, gl

17、ued laminated timber or wood based material to be used in the test shall be clearly defined. NOTE 1 Screws should be defined by reference to a recognized standard (e.g. EN 14592), in a manufacturers specification, or in a technical specification that includes material properties and screw characteri

18、stics. ISO 2014 All rights reserved 1 ISO 17754:2014(E) NOTE 2 The wood-based material specification should include species or type, grade, density, moisture content, deviations from specifications, and characteristics near the insertion point that might affect the result. 6 Test methods 6.1 General

19、 The moisture content and density of the test piece shall be determined according to ISO 3130 and ISO 3131. 6.2 Conditioning The test pieces shall be conditioned at (20 2) C and (65 5) % relative humidity to a constant mass. Constant mass is considered to be attained when the results of successive w

20、eighings, carried out at an interval of not less than 6 h, do not differ by more than 0,1 % of the mass of the material. For further investigations, other moisture conditioning might be appropriate and shall be reported. 6.3 Sampling The density of the test pieces or components of the test piece sha

21、ll comply with the density of the grade used in practise. The upper surface (receiving the point) shall predominantly be radial or tangential. 6.4 Test piece dimensions For solid timber and glued laminated timber test pieces, the minimum dimensions are given in Figure 1. For test pieces made of wood

22、based materials or combinations of wood-based materials and solid timber or glued laminated timber, the dimensions in the direction perpendicular to penetration shall be a minimum of 20d, where d is the nominal diameter of the screw. The test piece dimension in the penetration direction shall alway

23、s allow full penetration of the screw. 10d 10d 5d 5d l 10d 10d 10d 10d l Key d screw nominal diameter l total length of the screw grain direction Figure 1 Test piece of solid wood (left) and wood-based materials (right)2 ISO 2014 All rights reserved ISO 17754:2014(E) 7 Test 7.1 Test setup The test p

24、iece shall be mounted on the base plate of a frame and fixed in such a way as to prevent any movement during the test. The test rig shall allow for fixing a moment cell to the screwing device capable of moving in a vertical axis and for mounting displacement transducers on either side of the screwin

25、g device to measure vertical displacement. The moment cell used shall be capable of measuring the torque to an accuracy of 1 % of the torque applied to the screw. The equipment for measuring displacement shall be capable of measuring to an accuracy of 1 % of the measured value. NOTE An example test

26、arrangement is given in Figure 2. 7.2 Procedure A drive bit shall be fixed into the moment cell and a screw shall be mounted into the bit. The screw shall be installed according to the manufacturers instructions, including any pre-drilling requirements. Move the cross-head/screw assembly into a posi

27、tion where the screw tip is resting on the top of the test specimen. Drive the screw into the test specimen, either by using a mechanical drill or screwing machine or by using a hand screw wrench (100 r/min), until the screw is fully embedded along its entire length in the specimen. For countersunk

28、screws, this includes the thickness of the head. ISO 2014 All rights reserved 3 ISO 17754:2014(E) Key 1 mechanical drill, screwing machine, or hand screw wrench, screwing device 2 drill chuck/bit 3 moment cell 4 screw 5 displacement transducers 6 timber NOTE The vertical displacement of the cross-he

29、ad to screw assembly has to be recorded via the displacement transducers, and the screw insertion moment has to be recorded via the moment cell. Figure 2 Example of a test arrangement for screw insertion in timber 7.3 Results Determine for each specimen the maximum value of the screw insertion momen

30、t from the moment cell, R tor,max , prior to the point at which the screw head comes into contact with the test piece surface. NOTE Care is required to ensure that the moment is recorded before the head comes into contact with the test piece. 8 Test report 8.1 Test piece The following information sh

31、all be given: a) the technical specification of the screw and relevant information on their sampling; b) the description of the test piece, specification of the material, species or type, grade, density, moisture content, deviations from specifications, and characteristics near the insertion point t

32、hat might affect the result;4 ISO 2014 All rights reserved ISO 17754:2014(E) c) the sizes of the test pieces; d) the method of conditioning; e) the position and orientation of the screw; f) the details of pre-drilling (including any countersink); g) any other information which may have influenced th

33、e test results. 8.2 Test method The following information shall be given: a) a reference to this International Standard (i.e. ISO 17754); b) the test method applied insertion method and speed; c) the temperature and relative humidity at the time of test; d) the description of the testing device, the

34、 test equipment, and the measuring instruments; e) any other information which may have influenced the test results. 8.3 Test results The following information for each test piece shall be given: a) the maximum value of the screw insertion moment; b) the moisture content of the test piece material;

35、c) the actual dimensions, position of the insertion point; d) the location of failure, if any, in the test piece or screw; e) a plot of the moment to penetration depth for each specimen; f) the rotational speed of insertion; g) any other information which may have influenced the test results. ISO 20

36、14 All rights reserved 5 ISO 17754:2014(E) Bibliography 1 EN 14592, Timber Structures Dowel type fasteners Requirements 2 EN 15737:2007, Timber structures Test methods Torsional resistance of driving in screws6 ISO 2014 All rights reserved ISO 17754:2014(E) ISO 2014 All rights reserved IC S 91.080.20 Price based on 6 pages