1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 4604:2011Reinforcement fabrics Determination of conventionalflexural stiffness Fixed-angleflexometer methodBS ISO 4604:2011 BRITISH STANDARDNational forewordThis British S
2、tandard is the UK implementation of ISO 4604:2011.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/42, Fibre reinforced thermosetting plastics andprepregs.A list of organizations represented on this committee can beobtained on request to its secretary.This publication
3、does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 74663 5ICS 59.100.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority
4、of theStandards Policy and Strategy Committee on 31 December 2011.Amendments issued since publicationDate Text affectedBS ISO 4604:2011Reinforcement fabrics Determination of conventional flexural stiffness Fixed-angle flexometer methodTissus de renforcement Dtermination de la rigidit conventionnelle
5、 en flexion Mthode du flexomtre angle fixe ISO 2011Reference numberISO 4604:2011(E)Second edition2011-11-15ISO4604INTERNATIONAL STANDARDBS ISO 4604:2011ISO 4604:2011(E)COPYRIGHT PROTECTED DOCUMENT ISO 2011All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
6、or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11F
7、ax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in Switzerlandii ISO 2011 All rights reservedBS ISO 4604:2011ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Internat
8、ional 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, governmental and non-governmental, in liaison with I
9、SO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical com
10、mittees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the p
11、ossibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 4604 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 13, Composites and reinforcement fibres.This se
12、cond edition cancels and replaces the first edition (ISO 4604:1978), of which it constitutes a minor revision. The main changes are as follows: the scope has been broadened to cover all reinforcement fabrics (not just textile glass fabrics) and the title of the standard modified in consequence; the
13、normative references clause has been updated.ISO 4604:2011(E) ISO 2011 All rights reserved iiiBS ISO 4604:2011BS ISO 4604:2011INTERNATIONAL STANDARD ISO 4604:2011(E)Reinforcement fabrics Determination of conventional flexural stiffness Fixed-angle flexometer method1 ScopeThis International Standard
14、specifies a method of determining the conventional flexural stiffness of reinforcement fabrics by means of a fixed-angle flexometer. This method is not suitable for testing fabrics that are limp or that have a marked tendency to curl or twist or fray.2 Normative referencesThe following referenced do
15、cuments 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.ISO 291, Plastics Standard atmospheres for conditioning and testingISO 3374,
16、Reinforcement products Mats and fabrics Determination of mass per unit area3 PrincipleA rectangular strip of fabric is supported on a horizontal platform in a direction perpendicular to one edge of the platform. The strip is moved in the direction of its length so that an increasing portion overhang
17、s and bends down under its own weight. When the tip of the specimen has reached a plane passing through the edge of the platform and inclined at an angle of 41,5 below the horizontal, the overhanging length is measured.The conventional flexural stiffness is calculated from the overhanging length of
18、the test specimen and the mass per unit area of the fabric.NOTE This determination of the conventional flexural stiffness is based on a report published in Shirley lnstitute Memoirs, 9 (1930), p. 81, and Journal of the Textile lnstitute, 21 (1930), T380.4 Apparatus4.1 Fixed-angle flexometer, the ess
19、ential features of which are shown in Figure 1.On the horizontal platform P rests a slide S, graduated on its upper surface in millimetres.The under-surface of S is covered with a layer of high-friction antistatic material such as sheet rubber, and the upper surface of P is polished so that, when S
20、is moved, it will carry forward a specimen placed between the slide and the platform P.The width of the slide S shall be 25 mm and the length at least 300 mm, and its mass shall be 10 g 2 g per centimetre of length.When the front edge of the slide coincides with the front edge of P, the zero of the
21、scale on S coincides with a datum line D on the instrument. Two sighting lines, L1and L2, passing through the upper forward edge of P and inclined at an angle of 41,5 below the horizontal, are inscribed on the transparent side-pieces of the instrument.The range of the instrument is governed by its s
22、ize. It shall allow the determination of the overhanging length of the specimen. ISO 2011 All rights reserved 1BS ISO 4604:20114.2 Cutting die, measuring 250 mm 25 mm.4.3 Suitable cutting device.5 Conditioning and test atmosphereThe test specimens shall be conditioned for at least 6 h in an atmosphe
23、re chosen from those specified in ISO 291 until the mass of each specimen remains constant to within 0,25 % of its original mass when the specimen is reweighed at intervals of 2 h.The test shall be carried out in the same atmosphere.Dimensions in millimetresKeyD datum line on platformL1sighting line
24、L2sighting lineP platformS slideFigure 1 Fixed-angle flexometer for determination of stiffnessISO 4604:2011(E)2 ISO 2011 All rights reservedBS ISO 4604:20116 Test specimensRectangular specimens of width 25 mm and length 250 mm shall be cut from the fabrics to be tested.Six specimens shall be taken w
25、ith their long edges parallel to the direction of the warp threads (subsequently referred to as warp specimens) and six in the perpendicular direction (subsequently referred to as weft specimens). On each test specimen, identify the fabric faces.The specimens shall be cut so that, as far as possible
26、, no two warp specimens contain the same warp threads and no two weft specimens contain the same weft threads.Selvedges, end pieces and creased or folded places shall not be included in the specimens. The fabric and the specimens shall be handled as little as possible.7 Procedure7.1 Place the flexom
27、eter (4.1) on a level table. Place the test specimen on the platform P with one end coinciding with the front edge of the platform. Place the slide S on the specimen so that the zero of the scale is in line with the mark D. Push the slide slowly forward so that the specimen is made to project over t
28、he edge of P and bends down under its own weight. Continue to move the slide forward until the end of the specimen comes into line with the two lines L1and L2.If the specimen twists, align the mid-point of the end with L1and L2.Read the graduation on the slide S opposite the datum line D. The readin
29、g, in millimetres, is the overhanging length of the specimen.NOTE 1 A minor readjustment of the position of the slide might have to be made immediately before this reading is taken.NOTE 2 It will be found helpful in carrying out this procedure to place the flexometer so that the zero on the slide S
30、lies towards the observer and at a level which enables the reading to be read with comfort. The position of the end of the specimen relative to the sighting lines can then be observed in a mirror suitably placed or attached to one side of the instrument.7.2 Carry out the same operation with two othe
31、r specimens taken in the same direction and with the same surface of the fabric upwards. Repeat with the other three specimens taken in the same direction and with the other surface of the fabric upwards.7.3 Repeat steps 7.1 and 7.2 on the specimens taken in the other direction.8 Expression of resul
32、tsCalculate for each direction (warp or weft) of the fabric, and separately for each face, the average overhanging length l.ISO 4604:2011(E) ISO 2011 All rights reserved 3BS ISO 4604:2011Using the appropriate average value, calculate the conventional flexural stiffness G separately for each face of
33、the fabric and separately for the warp and weft directions of the fabric, using the formulaGl=9 8123, AwhereAis the mass per unit area, in grams per square metre, of the fabric, determined in accordance with ISO 3374;l is the appropriate average overhanging length, in metres;G is the conventional fl
34、exural stiffness, in millinewton metres, for the direction and face being considered.9 Test reportThe test report shall include the following information:a) a reference to this International Standard;b) all details necessary for complete identification of the reinforcement fabric tested, including i
35、ts construction;c) the conditioning temperature and relative humidity chosen from ISO 291;d) the conditioning time, in hours, if different from that specified;e) the number of warp and weft specimens tested, if different from that specified;f) the conventional warp flexural stiffness for each face o
36、f the fabric;g) the conventional weft flexural stiffness for each face of the fabric;h) details of any operations not provided for by this International Standard and of any incidents which might have had an influence upon the results;i) the date of the test;j) any other relevant information.ISO 4604
37、:2011(E)4 ISO 2011 All rights reservedBS ISO 4604:2011BS ISO 4604:2011ISO 4604:2011(E) ISO 2011 All rights reservedICS 59.100.10Price based on 4 pagesThis page deliberately left blankBSI is the independent national body responsible for preparing British Standardsand other standards-related publicati
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