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1、BRITISH STANDARD BS ISO 3342:1995 Implementation of ISO 3342:1995 Textile glass Mats Determination of tensile breaking force Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 02:04:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 3342:1995 This British Standard, having been prepared under t
2、he direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 October 1995 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference PRI/42 Draft for comment 94/302589 DC ISBN
3、 0 580 24763 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PRI/42, Thermosetting plastics, prepregs and fibre reinforcements, upon which the following bodies were represented: British Plastics Federation Department of
4、 the Environment (Building Research Establishment) Department of Trade and Industry (National Physical Laboratory) (BEAMA Ltd.) RAPRA Technology Ltd. Chemical Industries Association European Resin Manufacturers Association Amendments issued since publication Amd. No.DateComments Licensed Copy: sheff
5、ieldun sheffieldun, na, Mon Nov 27 02:04:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 3342:1995 BSI 01-2000i Contents Page Committees responsibleInside front cover National forewordii Forewordiii Text of ISO 33421 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 02:04:39 GMT+00:00 2006
6、, Uncontrolled Copy, (c) BSI BS ISO 3342:1995 ii BSI 01-2000 National foreword This British Standard reproduces verbatim ISO 3342:1995 and implements it as the UK national standard. This British Standard is published under the direction of the Sector Board for Materials and Chemicals whose Technical
7、 Committee PRI/42 has the responsibility to: aid enquirers to understand the text; present to the responsible international committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them
8、in the UK. NOTEInternational and European Standards, as well as overseas standards, are available from Customer Services, BSI, 389 Chiswick High Road, London W4 4AL. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible
9、for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the ISO title page, pages ii to iv, pages 1 to 3 and a back cover. This standard
10、 has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 02:04:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun,
11、 na, Mon Nov 27 02:04:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 3342:1995(E) ii BSI 01-2000 Contents Page Forewordiii 1Scope1 2Normative references1 3Definition1 4Principle1 5Apparatus1 6Conditioning and test atmosphere2 7Test specimens2 8Procedure2 9Expression of results2 10Precision2 11Tes
12、t report3 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 02:04:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 3342:1995(E) BSI 01-2000iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work
13、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, governmental and non-government
14、al, 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. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
15、 Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 3342 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 13, Composites and reinforcement fibres. This third edition cancels and replaces
16、the second edition (ISO 3342:1987), which has been technically revised. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 02:04:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 02:04:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 3
17、342:1995(E) BSI 01-20001 1 Scope This International Standard specifies a method for the determination of the tensile breaking force of textile glass mats. The method is intended for chopped-strand mat but is equally applicable to certain types of continuous-strand mat usually intended for pultrusion
18、. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on th
19、is International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 139:1973, Textiles Standard atmospheres for conditioning and testin
20、g. ISO 291:1977, Plastics Standard atmospheres for conditioning and testing. ISO 3374:1990, Textile glass mats Determination of mass per unit area. 3 Definition For the purposes of this International Standard, the following definition applies. 3.1 tensile breaking force the maximum force required to
21、 break the test specimen in a tensile test carried to rupture it is generally expressed in newtons 4 Principle A pre-conditioned test specimen of standard dimensions is subjected to tension by a suitable mechanical device which indicates the tensile breaking force on a recorder or scale. NOTE 1The t
22、est results may vary significantly depending whether they are obtained on rolls of mat or on the mat prior to winding into rolls (normally, the result is higher prior to winding). The method specified in this standard describes the procedure for testing rolls of mat. 5 Apparatus 5.1 Tensile-testing
23、machine 5.1.1 All testing machines shall include the following elements: a) A pair of suitable clamps to grip the specimen. They shall have a width of 160 mm and a minimum depth of 25 mm. The faces of the clamps shall be plane and parallel, shall ensure uniform pressure over the whole width of the t
24、est specimen and shall prevent it from slipping. The clamps shall also ensure, at all times, alignment of the axis of the test specimen with the direction of the applied force. The initial distance between the clamps shall be 200 mm. b) A means for applying tension to the specimen. c) A mechanism th
25、at will continuously indicate or record the force sustained by specimen. The mechanism shall be practically free from inertia at the specified speed of testing and shall indicate the force with an accuracy within 1 % of the true value. The reference machine is one having a constant rate of extension
26、. Other types of test machine exist, e.g. with constant rate of loading or constant rate of traverse. If only such machines are available, they may be used by agreement between interested parties, but the results from different types of machine cannot necessarily be compared. 5.1.2 The maximum error
27、 in the indicated force, at any point in the range in which the machine is used, shall not exceed 1 % of the true force. The error in the length of specimen exposed between the clamps shall not exceed 2 mm. The accuracy of the tensile-testing machine shall be verified, for example by means of calibr
28、ated springs with appropriate characteristics. 5.2 Equipment for producing a suitable conditioning atmosphere (see 6.1) 5.3 Equipment for producing and maintaining the standard laboratory test atmosphere (see 6.2) 5.4 Template for cutting out specimens For chopped-strand mat: Polished template 150 m
29、m wide and 316 mm long. For continuous-strand mat for pultrusion applications: Polished template 75 mm wide and 316 mm long. 5.5 Suitable trimming tool For example a knife, scissors or a disc cutter. 5.6 Stopwatch Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 02:04:39 GMT+00:00 2006, Uncont
30、rolled Copy, (c) BSI ISO 3342:1995(E) 2 BSI 01-2000 6 Conditioning and test atmosphere 6.1 Conditioning Condition the material under test in one of the standard laboratory atmospheres specified in ISO 139 or ISO 291 at the rate of: 16 h for complete rolls; 1 h for test specimens or laboratory sample
31、s. Indicate in the test report the conditioning atmosphere chosen. 6.2 Test atmosphere Carry out the tests in one of the standard laboratory atmospheres specified in ISO 139 or ISO 291. The provisions of subclauses 6.1 and 6.2 do not have to be used for routine quality-control purposes at fabricatio
32、n. In this case, the person responsible for the laboratory shall assess the influence of the actual conditions (temperature, humidity) on the results obtained. For drawing up specifications, and for any testing done in formal relation with these specifications, the standard conditioning specified ab
33、ove shall be used. 7 Test specimens Before preparing any test specimens, remove and discard from the roll at least two layers of mat to obtain an area free from any damage. From this area, cut a strip at least 400 mm wide, using the trimming tool (5.5). Handle this strip with great care in order to
34、avoid creasing it. Take the same precautions with the test specimens cut out as described below. Using the template (5.4), cut from this strip test specimens 150 mm wide (or 75 mm for continuous-strand mat) and 316 mm long, with the major axis of the specimens lying parallel to the longitudinal dire
35、ction of the mat. If additional tests are to be made with the major axis of the specimens parallel to the transverse direction of the mat, cut out specimens 316 mm long across the mat width. Cut out these specimens ensuring that they are equidistant from each other and are not less than 10 mm from t
36、he edges in the case of trimmed mats. In the case of continuous-strand mat, use only longitudinal specimens, i.e. specimens with their major axis parallel to the longitudinal direction of the mat. By default, one determination of the tensile breaking force shall be based on five specimens or more, d
37、epending on the width of the mat. If the width of the mat does not allow sufficient test specimens to be taken side by side, selection may be completed by cutting specimens from additional strips, again ensuring that the specimens are evenly distributed. It may be convenient to cut the specimens fro
38、m those which have been used to determine the mass per unit area of the mat in accordance with ISO 3374. In this case, ensure that the specimens are handled with care. The product specification or the persons ordering the test may require other methods of preparation of the test specimens. If so, th
39、ese shall be described in the test report. 8 Procedure 8.1 Adjust the distance between the clamps to give a free specimen length of 200 mm. 8.2 Adjust the speed of the testing machine to give a rate of clamp separation of 200 mm/min 10 mm/min. 8.3 Ensure that the clamps are properly aligned. Positio
40、n the specimen in the clamps so that the longitudinal axis of the specimen is aligned with the mechanical axis of the tensile tester. Tighten the clamps, evenly and firmly, applying a slight tension to the specimen so that it is straight. Start the tensile tester and stretch the specimen to the poin
41、t of break. Record the force, in newtons, required to break the specimen. Discard results obtained from test specimens that break within 10 mm of the clamps or that slip in the clamps, and test an appropriate number of additional specimens so as to obtain the required number of results (see clause 7
42、). If the break is not a clean one, this shall be noted in the test report. 9 Expression of results Calculate the tensile breaking force, in newtons, of the mat as the mean of the individual values obtained for each test specimen, and round the mean to the nearest 1 N. If required, calculate the ran
43、ge of the results obtained for the specimens from a particular elementary unit. 10 Precision The precision of this test method is not known because interlaboratory data are not available. When such data are obtained, a precision statement will be added at the following revision. Licensed Copy: sheff
44、ieldun sheffieldun, na, Mon Nov 27 02:04:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 3342:1995(E) BSI 01-20003 11 Test report The test report shall include the following particulars: a) a reference to this International Standard; b) all details necessary for the complete identification of the
45、mat tested; c) the number of specimens tested; d) the conditioning and test atmospheres chosen; e) the type of tensile-testing machine used, the capacity of the machine and the scale range used; f) the tensile breaking force in the longitudinal direction and, if applicable, in the transverse directi
46、on of the mat; g) if required, the range of the results for the specimens from the same elementary unit; h) a note describing the rupture of the specimen if the break is not a clean one. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 02:04:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO
47、 3342:1995 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions Britis
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